Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 952 insertions, 0 deletions

diff --git a/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/ci.cmake b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/ci.cmake
new file mode 100644
index 000000000..d0b989c80
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/ci.cmake
@@ -0,0 +1,857 @@
+# number of parallel jobs for CTest
+set(N 10)
+
+###############################################################################
+# Needed tools.
+###############################################################################
+
+include(FindPython3)
+find_package(Python3 COMPONENTS Interpreter)
+
+find_program(ASTYLE_TOOL NAMES astyle)
+execute_process(COMMAND ${ASTYLE_TOOL} --version OUTPUT_VARIABLE ASTYLE_TOOL_VERSION ERROR_VARIABLE ASTYLE_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" ASTYLE_TOOL_VERSION "${ASTYLE_TOOL_VERSION}")
+message(STATUS "🔖 Artistic Style ${ASTYLE_TOOL_VERSION} (${ASTYLE_TOOL})")
+
+find_program(CLANG_TOOL NAMES clang++-HEAD clang++-14 clang++-13 clang++-12 clang++-11 clang++)
+execute_process(COMMAND ${CLANG_TOOL} --version OUTPUT_VARIABLE CLANG_TOOL_VERSION ERROR_VARIABLE CLANG_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TOOL_VERSION "${CLANG_TOOL_VERSION}")
+message(STATUS "🔖 Clang ${CLANG_TOOL_VERSION} (${CLANG_TOOL})")
+
+find_program(CLANG_TIDY_TOOL NAMES clang-tidy-14 clang-tidy-13 clang-tidy-12 clang-tidy-11 clang-tidy)
+execute_process(COMMAND ${CLANG_TIDY_TOOL} --version OUTPUT_VARIABLE CLANG_TIDY_TOOL_VERSION ERROR_VARIABLE CLANG_TIDY_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TIDY_TOOL_VERSION "${CLANG_TIDY_TOOL_VERSION}")
+message(STATUS "🔖 Clang-Tidy ${CLANG_TIDY_TOOL_VERSION} (${CLANG_TIDY_TOOL})")
+
+message(STATUS "🔖 CMake ${CMAKE_VERSION} (${CMAKE_COMMAND})")
+
+find_program(CPPCHECK_TOOL NAMES cppcheck)
+execute_process(COMMAND ${CPPCHECK_TOOL} --version OUTPUT_VARIABLE CPPCHECK_TOOL_VERSION ERROR_VARIABLE CPPCHECK_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CPPCHECK_TOOL_VERSION "${CPPCHECK_TOOL_VERSION}")
+message(STATUS "🔖 Cppcheck ${CPPCHECK_TOOL_VERSION} (${CPPCHECK_TOOL})")
+
+find_program(GCC_TOOL NAMES g++-HEAD g++-11 g++-latest)
+execute_process(COMMAND ${GCC_TOOL} --version OUTPUT_VARIABLE GCC_TOOL_VERSION ERROR_VARIABLE GCC_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCC_TOOL_VERSION "${GCC_TOOL_VERSION}")
+message(STATUS "🔖 GCC ${GCC_TOOL_VERSION} (${GCC_TOOL})")
+
+find_program(GCOV_TOOL NAMES gcov-HEAD gcov-11 gcov-10 gcov)
+execute_process(COMMAND ${GCOV_TOOL} --version OUTPUT_VARIABLE GCOV_TOOL_VERSION ERROR_VARIABLE GCOV_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCOV_TOOL_VERSION "${GCOV_TOOL_VERSION}")
+message(STATUS "🔖 GCOV ${GCOV_TOOL_VERSION} (${GCOV_TOOL})")
+
+find_program(GIT_TOOL NAMES git)
+execute_process(COMMAND ${GIT_TOOL} --version OUTPUT_VARIABLE GIT_TOOL_VERSION ERROR_VARIABLE GIT_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GIT_TOOL_VERSION "${GIT_TOOL_VERSION}")
+message(STATUS "🔖 Git ${GIT_TOOL_VERSION} (${GIT_TOOL})")
+
+find_program(IWYU_TOOL NAMES include-what-you-use iwyu)
+execute_process(COMMAND ${IWYU_TOOL} --version OUTPUT_VARIABLE IWYU_TOOL_VERSION ERROR_VARIABLE IWYU_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" IWYU_TOOL_VERSION "${IWYU_TOOL_VERSION}")
+message(STATUS "🔖 include-what-you-use ${IWYU_TOOL_VERSION} (${IWYU_TOOL})")
+
+find_program(INFER_TOOL NAMES infer)
+execute_process(COMMAND ${INFER_TOOL} --version OUTPUT_VARIABLE INFER_TOOL_VERSION ERROR_VARIABLE INFER_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" INFER_TOOL_VERSION "${INFER_TOOL_VERSION}")
+message(STATUS "🔖 Infer ${INFER_TOOL_VERSION} (${INFER_TOOL})")
+
+find_program(LCOV_TOOL NAMES lcov)
+execute_process(COMMAND ${LCOV_TOOL} --version OUTPUT_VARIABLE LCOV_TOOL_VERSION ERROR_VARIABLE LCOV_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" LCOV_TOOL_VERSION "${LCOV_TOOL_VERSION}")
+message(STATUS "🔖 LCOV ${LCOV_TOOL_VERSION} (${LCOV_TOOL})")
+
+find_program(NINJA_TOOL NAMES ninja)
+execute_process(COMMAND ${NINJA_TOOL} --version OUTPUT_VARIABLE NINJA_TOOL_VERSION ERROR_VARIABLE NINJA_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" NINJA_TOOL_VERSION "${NINJA_TOOL_VERSION}")
+message(STATUS "🔖 Ninja ${NINJA_TOOL_VERSION} (${NINJA_TOOL})")
+
+find_program(OCLINT_TOOL NAMES oclint-json-compilation-database)
+find_program(OCLINT_VERSION_TOOL NAMES oclint)
+execute_process(COMMAND ${OCLINT_VERSION_TOOL} --version OUTPUT_VARIABLE OCLINT_TOOL_VERSION ERROR_VARIABLE OCLINT_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" OCLINT_TOOL_VERSION "${OCLINT_TOOL_VERSION}")
+message(STATUS "🔖 OCLint ${OCLINT_TOOL_VERSION} (${OCLINT_TOOL})")
+
+find_program(VALGRIND_TOOL NAMES valgrind)
+execute_process(COMMAND ${VALGRIND_TOOL} --version OUTPUT_VARIABLE VALGRIND_TOOL_VERSION ERROR_VARIABLE VALGRIND_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" VALGRIND_TOOL_VERSION "${VALGRIND_TOOL_VERSION}")
+message(STATUS "🔖 Valgrind ${VALGRIND_TOOL_VERSION} (${VALGRIND_TOOL})")
+
+find_program(GENHTML_TOOL NAMES genhtml)
+find_program(PLOG_CONVERTER_TOOL NAMES plog-converter)
+find_program(PVS_STUDIO_ANALYZER_TOOL NAMES pvs-studio-analyzer)
+find_program(SCAN_BUILD_TOOL NAMES scan-build-14 scan-build-13 scan-build-12 scan-build-11 scan-build)
+
+# the individual source files
+file(GLOB_RECURSE SRC_FILES ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp)
+
+###############################################################################
+# Thorough check with recent compilers
+###############################################################################
+
+# Ignored Clang warnings:
+# -Wno-c++98-compat               The library targets C++11.
+# -Wno-c++98-compat-pedantic      The library targets C++11.
+# -Wno-deprecated-declarations    The library contains annotations for deprecated functions.
+# -Wno-extra-semi-stmt            The library uses std::assert which triggers this warning.
+# -Wno-padded                     We do not care about padding warnings.
+# -Wno-covered-switch-default     All switches list all cases and a default case.
+# -Wno-weak-vtables               The library is header-only.
+# -Wreserved-identifier           See https://github.com/onqtam/doctest/issues/536.
+
+set(CLANG_CXXFLAGS "-std=c++11                        \
+    -Werror                                           \
+    -Weverything                                      \
+    -Wno-c++98-compat                                    \
+    -Wno-c++98-compat-pedantic                           \
+    -Wno-deprecated-declarations                         \
+    -Wno-extra-semi-stmt                                 \
+    -Wno-padded                                          \
+    -Wno-covered-switch-default                          \
+    -Wno-weak-vtables                                    \
+    -Wno-reserved-identifier                             \
+")
+
+# Ignored GCC warnings:
+# -Wno-abi-tag                    We do not care about ABI tags.
+# -Wno-aggregate-return           The library uses aggregate returns.
+# -Wno-long-long                  The library uses the long long type to interface with system functions.
+# -Wno-namespaces                 The library uses namespaces.
+# -Wno-padded                     We do not care about padding warnings.
+# -Wno-system-headers             We do not care about warnings in system headers.
+# -Wno-templates                  The library uses templates.
+
+set(GCC_CXXFLAGS "-std=c++11                          \
+    -pedantic                                         \
+    -Werror                                           \
+    --all-warnings                                    \
+    --extra-warnings                                  \
+    -W                                                \
+    -WNSObject-attribute                              \
+    -Wno-abi-tag                                         \
+    -Waddress                                         \
+    -Waddress-of-packed-member                        \
+    -Wno-aggregate-return                                \
+    -Waggressive-loop-optimizations                   \
+    -Waligned-new=all                                 \
+    -Wall                                             \
+    -Walloc-zero                                      \
+    -Walloca                                          \
+    -Wanalyzer-double-fclose                          \
+    -Wanalyzer-double-free                            \
+    -Wanalyzer-exposure-through-output-file           \
+    -Wanalyzer-file-leak                              \
+    -Wanalyzer-free-of-non-heap                       \
+    -Wanalyzer-malloc-leak                            \
+    -Wanalyzer-mismatching-deallocation               \
+    -Wanalyzer-null-argument                          \
+    -Wanalyzer-null-dereference                       \
+    -Wanalyzer-possible-null-argument                 \
+    -Wanalyzer-possible-null-dereference              \
+    -Wanalyzer-shift-count-negative                   \
+    -Wanalyzer-shift-count-overflow                   \
+    -Wanalyzer-stale-setjmp-buffer                    \
+    -Wanalyzer-tainted-array-index                    \
+    -Wanalyzer-too-complex                            \
+    -Wanalyzer-unsafe-call-within-signal-handler      \
+    -Wanalyzer-use-after-free                         \
+    -Wanalyzer-use-of-pointer-in-stale-stack-frame    \
+    -Wanalyzer-write-to-const                         \
+    -Wanalyzer-write-to-string-literal                \
+    -Warith-conversion                                \
+    -Warray-bounds                                    \
+    -Warray-bounds=2                                  \
+    -Warray-parameter=2                               \
+    -Wattribute-alias=2                               \
+    -Wattribute-warning                               \
+    -Wattributes                                      \
+    -Wbool-compare                                    \
+    -Wbool-operation                                  \
+    -Wbuiltin-declaration-mismatch                    \
+    -Wbuiltin-macro-redefined                         \
+    -Wc++0x-compat                                    \
+    -Wc++11-compat                                    \
+    -Wc++14-compat                                    \
+    -Wc++17-compat                                    \
+    -Wc++1z-compat                                    \
+    -Wc++20-compat                                    \
+    -Wc++2a-compat                                    \
+    -Wcannot-profile                                  \
+    -Wcast-align                                      \
+    -Wcast-align=strict                               \
+    -Wcast-function-type                              \
+    -Wcast-qual                                       \
+    -Wcatch-value=3                                   \
+    -Wchar-subscripts                                 \
+    -Wclass-conversion                                \
+    -Wclass-memaccess                                 \
+    -Wclobbered                                       \
+    -Wcomma-subscript                                 \
+    -Wcomment                                         \
+    -Wcomments                                        \
+    -Wconditionally-supported                         \
+    -Wconversion                                      \
+    -Wconversion-null                                 \
+    -Wcoverage-mismatch                               \
+    -Wcpp                                             \
+    -Wctad-maybe-unsupported                          \
+    -Wctor-dtor-privacy                               \
+    -Wdangling-else                                   \
+    -Wdate-time                                       \
+    -Wdelete-incomplete                               \
+    -Wdelete-non-virtual-dtor                         \
+    -Wdeprecated                                      \
+    -Wdeprecated-copy                                 \
+    -Wdeprecated-copy-dtor                            \
+    -Wdeprecated-declarations                         \
+    -Wdeprecated-enum-enum-conversion                 \
+    -Wdeprecated-enum-float-conversion                \
+    -Wdisabled-optimization                           \
+    -Wdiv-by-zero                                     \
+    -Wdouble-promotion                                \
+    -Wduplicated-branches                             \
+    -Wduplicated-cond                                 \
+    -Weffc++                                          \
+    -Wempty-body                                      \
+    -Wendif-labels                                    \
+    -Wenum-compare                                    \
+    -Wenum-conversion                                 \
+    -Wexpansion-to-defined                            \
+    -Wextra                                           \
+    -Wextra-semi                                      \
+    -Wfloat-conversion                                \
+    -Wfloat-equal                                     \
+    -Wformat-contains-nul                             \
+    -Wformat-diag                                     \
+    -Wformat-extra-args                               \
+    -Wformat-nonliteral                               \
+    -Wformat-overflow=2                               \
+    -Wformat-security                                 \
+    -Wformat-signedness                               \
+    -Wformat-truncation=2                             \
+    -Wformat-y2k                                      \
+    -Wformat-zero-length                              \
+    -Wformat=2                                        \
+    -Wframe-address                                   \
+    -Wfree-nonheap-object                             \
+    -Whsa                                             \
+    -Wif-not-aligned                                  \
+    -Wignored-attributes                              \
+    -Wignored-qualifiers                              \
+    -Wimplicit-fallthrough=5                          \
+    -Winaccessible-base                               \
+    -Winherited-variadic-ctor                         \
+    -Winit-list-lifetime                              \
+    -Winit-self                                       \
+    -Winline                                          \
+    -Wint-in-bool-context                             \
+    -Wint-to-pointer-cast                             \
+    -Winvalid-memory-model                            \
+    -Winvalid-offsetof                                \
+    -Winvalid-pch                                     \
+    -Wliteral-suffix                                  \
+    -Wlogical-not-parentheses                         \
+    -Wlogical-op                                      \
+    -Wno-long-long                                       \
+    -Wlto-type-mismatch                               \
+    -Wmain                                            \
+    -Wmaybe-uninitialized                             \
+    -Wmemset-elt-size                                 \
+    -Wmemset-transposed-args                          \
+    -Wmisleading-indentation                          \
+    -Wmismatched-dealloc                              \
+    -Wmismatched-new-delete                           \
+    -Wmismatched-tags                                 \
+    -Wmissing-attributes                              \
+    -Wmissing-braces                                  \
+    -Wmissing-declarations                            \
+    -Wmissing-field-initializers                      \
+    -Wmissing-include-dirs                            \
+    -Wmissing-profile                                 \
+    -Wmultichar                                       \
+    -Wmultiple-inheritance                            \
+    -Wmultistatement-macros                           \
+    -Wno-namespaces                                      \
+    -Wnarrowing                                       \
+    -Wnoexcept                                        \
+    -Wnoexcept-type                                   \
+    -Wnon-template-friend                             \
+    -Wnon-virtual-dtor                                \
+    -Wnonnull                                         \
+    -Wnonnull-compare                                 \
+    -Wnormalized=nfkc                                 \
+    -Wnull-dereference                                \
+    -Wodr                                             \
+    -Wold-style-cast                                  \
+    -Wopenmp-simd                                     \
+    -Woverflow                                        \
+    -Woverlength-strings                              \
+    -Woverloaded-virtual                              \
+    -Wpacked                                          \
+    -Wpacked-bitfield-compat                          \
+    -Wpacked-not-aligned                              \
+    -Wno-padded                                          \
+    -Wparentheses                                     \
+    -Wpedantic                                        \
+    -Wpessimizing-move                                \
+    -Wplacement-new=2                                 \
+    -Wpmf-conversions                                 \
+    -Wpointer-arith                                   \
+    -Wpointer-compare                                 \
+    -Wpragmas                                         \
+    -Wprio-ctor-dtor                                  \
+    -Wpsabi                                           \
+    -Wrange-loop-construct                            \
+    -Wredundant-decls                                 \
+    -Wredundant-move                                  \
+    -Wredundant-tags                                  \
+    -Wregister                                        \
+    -Wreorder                                         \
+    -Wrestrict                                        \
+    -Wreturn-local-addr                               \
+    -Wreturn-type                                     \
+    -Wscalar-storage-order                            \
+    -Wsequence-point                                  \
+    -Wshadow=compatible-local                         \
+    -Wshadow=global                                   \
+    -Wshadow=local                                    \
+    -Wshift-count-negative                            \
+    -Wshift-count-overflow                            \
+    -Wshift-negative-value                            \
+    -Wshift-overflow=2                                \
+    -Wsign-compare                                    \
+    -Wsign-conversion                                 \
+    -Wsign-promo                                      \
+    -Wsized-deallocation                              \
+    -Wsizeof-array-argument                           \
+    -Wsizeof-array-div                                \
+    -Wsizeof-pointer-div                              \
+    -Wsizeof-pointer-memaccess                        \
+    -Wstack-protector                                 \
+    -Wstrict-aliasing                                 \
+    -Wstrict-aliasing=3                               \
+    -Wstrict-null-sentinel                            \
+    -Wstrict-overflow                                 \
+    -Wstrict-overflow=5                               \
+    -Wstring-compare                                  \
+    -Wstringop-overflow=4                             \
+    -Wstringop-overread                               \
+    -Wstringop-truncation                             \
+    -Wsubobject-linkage                               \
+    -Wsuggest-attribute=cold                          \
+    -Wsuggest-attribute=const                         \
+    -Wsuggest-attribute=format                        \
+    -Wsuggest-attribute=malloc                        \
+    -Wsuggest-attribute=noreturn                      \
+    -Wsuggest-attribute=pure                          \
+    -Wsuggest-final-methods                           \
+    -Wsuggest-final-types                             \
+    -Wsuggest-override                                \
+    -Wswitch                                          \
+    -Wswitch-bool                                     \
+    -Wswitch-default                                  \
+    -Wswitch-enum                                     \
+    -Wswitch-outside-range                            \
+    -Wswitch-unreachable                              \
+    -Wsync-nand                                       \
+    -Wsynth                                           \
+    -Wno-system-headers                                  \
+    -Wtautological-compare                            \
+    -Wno-templates                                       \
+    -Wterminate                                       \
+    -Wtrampolines                                     \
+    -Wtrigraphs                                       \
+    -Wtsan                                            \
+    -Wtype-limits                                     \
+    -Wundef                                           \
+    -Wuninitialized                                   \
+    -Wunknown-pragmas                                 \
+    -Wunreachable-code                                \
+    -Wunsafe-loop-optimizations                       \
+    -Wunused                                          \
+    -Wunused-but-set-parameter                        \
+    -Wunused-but-set-variable                         \
+    -Wunused-const-variable=2                         \
+    -Wunused-function                                 \
+    -Wunused-label                                    \
+    -Wunused-local-typedefs                           \
+    -Wunused-macros                                   \
+    -Wunused-parameter                                \
+    -Wunused-result                                   \
+    -Wunused-value                                    \
+    -Wunused-variable                                 \
+    -Wuseless-cast                                    \
+    -Wvarargs                                         \
+    -Wvariadic-macros                                 \
+    -Wvector-operation-performance                    \
+    -Wvexing-parse                                    \
+    -Wvirtual-inheritance                             \
+    -Wvirtual-move-assign                             \
+    -Wvla                                             \
+    -Wvla-parameter                                   \
+    -Wvolatile                                        \
+    -Wvolatile-register-var                           \
+    -Wwrite-strings                                   \
+    -Wzero-as-null-pointer-constant                   \
+    -Wzero-length-bounds                              \
+")
+
+add_custom_target(ci_test_gcc
+    COMMAND CXX=${GCC_TOOL} CXXFLAGS=${GCC_CXXFLAGS} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_gcc
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_gcc
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_gcc && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with GCC using maximal warning flags"
+)
+
+add_custom_target(ci_test_clang
+    COMMAND CXX=${CLANG_TOOL} CXXFLAGS=${CLANG_CXXFLAGS} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with Clang using maximal warning flags"
+)
+
+###############################################################################
+# Different C++ Standards.
+###############################################################################
+
+foreach(CXX_STANDARD 11 14 17 20)
+    add_custom_target(ci_test_gcc_cxx${CXX_STANDARD}
+        COMMAND CXX=${GCC_TOOL} ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DCMAKE_CXX_STANDARD=${CXX_STANDARD} -DCMAKE_CXX_STANDARD_REQUIRED=ON
+            -DJSON_BuildTests=ON -DJSON_FastTests=ON
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with GCC for C++${CXX_STANDARD}"
+    )
+
+    add_custom_target(ci_test_clang_cxx${CXX_STANDARD}
+        COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DCMAKE_CXX_STANDARD=${CXX_STANDARD} -DCMAKE_CXX_STANDARD_REQUIRED=ON
+            -DJSON_BuildTests=ON
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with Clang for C++${CXX_STANDARD}"
+    )
+endforeach()
+
+###############################################################################
+# Disable exceptions.
+###############################################################################
+
+add_custom_target(ci_test_noexceptions
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON -DCMAKE_CXX_FLAGS=-DJSON_NOEXCEPTION -DDOCTEST_TEST_FILTER=--no-throw
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noexceptions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_noexceptions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_noexceptions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with exceptions switched off"
+)
+
+###############################################################################
+# Disable implicit conversions.
+###############################################################################
+
+add_custom_target(ci_test_noimplicitconversions
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON -DJSON_ImplicitConversions=OFF
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noimplicitconversions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_noimplicitconversions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_noimplicitconversions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with implicit conversions switched off"
+)
+
+###############################################################################
+# Enable improved diagnostics.
+###############################################################################
+
+add_custom_target(ci_test_diagnostics
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON -DJSON_Diagnostics=ON
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_diagnostics
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_diagnostics
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_diagnostics && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with improved diagnostics enabled"
+)
+
+###############################################################################
+# Coverage.
+###############################################################################
+
+add_custom_target(ci_test_coverage
+    COMMAND CXX=g++ ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja -DCMAKE_CXX_FLAGS="--coverage;-fprofile-arcs;-ftest-coverage"
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_coverage
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_coverage
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_coverage && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+
+    COMMAND ${LCOV_TOOL} --directory . --capture --output-file json.info --rc lcov_branch_coverage=1
+    COMMAND ${LCOV_TOOL} -e json.info ${SRC_FILES} --output-file json.info.filtered --rc lcov_branch_coverage=1
+    COMMAND ${CMAKE_SOURCE_DIR}/test/thirdparty/imapdl/filterbr.py json.info.filtered > json.info.filtered.noexcept
+    COMMAND genhtml --title "JSON for Modern C++" --legend --demangle-cpp --output-directory html --show-details --branch-coverage json.info.filtered.noexcept
+
+    COMMENT "Compile and test with coverage"
+)
+
+###############################################################################
+# Sanitizers.
+###############################################################################
+
+set(CLANG_CXX_FLAGS_SANITIZER "-g -O1 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer -fno-sanitize-recover=all -fno-sanitize=unsigned-integer-overflow -fno-sanitize=unsigned-shift-base")
+
+add_custom_target(ci_test_clang_sanitizer
+    COMMAND CXX=${CLANG_TOOL} CXXFLAGS=${CLANG_CXX_FLAGS_SANITIZER} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_sanitizer
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_sanitizer
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_sanitizer && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with sanitizers"
+)
+
+###############################################################################
+# Check if header is amalgamated and sources are properly indented.
+###############################################################################
+
+set(ASTYLE_FLAGS --style=allman --indent=spaces=4 --indent-modifiers --indent-switches --indent-preproc-block --indent-preproc-define --indent-col1-comments --pad-oper --pad-header --align-pointer=type --align-reference=type --add-brackets --convert-tabs --close-templates --lineend=linux --preserve-date --formatted)
+
+file(GLOB_RECURSE INDENT_FILES
+    ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp
+    ${PROJECT_SOURCE_DIR}/test/src/*.cpp
+    ${PROJECT_SOURCE_DIR}/test/src/*.hpp
+    ${PROJECT_SOURCE_DIR}/benchmarks/src/benchmarks.cpp
+    ${PROJECT_SOURCE_DIR}/doc/examples/*.cpp
+)
+
+add_custom_target(ci_test_amalgamation
+    COMMAND rm -fr ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp~
+    COMMAND cp ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp~
+    COMMAND ${Python3_EXECUTABLE} ${PROJECT_SOURCE_DIR}/third_party/amalgamate/amalgamate.py -c ${PROJECT_SOURCE_DIR}/third_party/amalgamate/config.json -s .
+    COMMAND ${ASTYLE_TOOL} ${ASTYLE_FLAGS} --suffix=none --quiet ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp
+    COMMAND diff ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp~ ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp
+
+    COMMAND ${ASTYLE_TOOL} ${ASTYLE_FLAGS} ${INDENT_FILES}
+    COMMAND cd ${PROJECT_SOURCE_DIR} && for FILE in `find . -name '*.orig'`\; do false \; done
+
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    COMMENT "Check amalagamation and indentation"
+)
+
+###############################################################################
+# Valgrind.
+###############################################################################
+
+add_custom_target(ci_test_valgrind
+    COMMAND CXX=${GCC_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_Valgrind=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_valgrind
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_valgrind
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_valgrind && ${CMAKE_CTEST_COMMAND} -L valgrind --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with Valgrind"
+)
+
+###############################################################################
+# Check code with Clang Static Analyzer.
+###############################################################################
+
+set(CLANG_ANALYZER_CHECKS "fuchsia.HandleChecker,nullability.NullableDereferenced,nullability.NullablePassedToNonnull,nullability.NullableReturnedFromNonnull,optin.cplusplus.UninitializedObject,optin.cplusplus.VirtualCall,optin.mpi.MPI-Checker,optin.osx.OSObjectCStyleCast,optin.osx.cocoa.localizability.EmptyLocalizationContextChecker,optin.osx.cocoa.localizability.NonLocalizedStringChecker,optin.performance.GCDAntipattern,optin.performance.Padding,optin.portability.UnixAPI,security.FloatLoopCounter,security.insecureAPI.DeprecatedOrUnsafeBufferHandling,security.insecureAPI.bcmp,security.insecureAPI.bcopy,security.insecureAPI.bzero,security.insecureAPI.rand,security.insecureAPI.strcpy,valist.CopyToSelf,valist.Uninitialized,valist.Unterminated,webkit.NoUncountedMemberChecker,webkit.RefCntblBaseVirtualDtor,core.CallAndMessage,core.DivideZero,core.NonNullParamChecker,core.NullDereference,core.StackAddressEscape,core.UndefinedBinaryOperatorResult,core.VLASize,core.uninitialized.ArraySubscript,core.uninitialized.Assign,core.uninitialized.Branch,core.uninitialized.CapturedBlockVariable,core.uninitialized.UndefReturn,cplusplus.InnerPointer,cplusplus.Move,cplusplus.NewDelete,cplusplus.NewDeleteLeaks,cplusplus.PlacementNew,cplusplus.PureVirtualCall,deadcode.DeadStores,nullability.NullPassedToNonnull,nullability.NullReturnedFromNonnull,osx.API,osx.MIG,osx.NumberObjectConversion,osx.OSObjectRetainCount,osx.ObjCProperty,osx.SecKeychainAPI,osx.cocoa.AtSync,osx.cocoa.AutoreleaseWrite,osx.cocoa.ClassRelease,osx.cocoa.Dealloc,osx.cocoa.IncompatibleMethodTypes,osx.cocoa.Loops,osx.cocoa.MissingSuperCall,osx.cocoa.NSAutoreleasePool,osx.cocoa.NSError,osx.cocoa.NilArg,osx.cocoa.NonNilReturnValue,osx.cocoa.ObjCGenerics,osx.cocoa.RetainCount,osx.cocoa.RunLoopAutoreleaseLeak,osx.cocoa.SelfInit,osx.cocoa.SuperDealloc,osx.cocoa.UnusedIvars,osx.cocoa.VariadicMethodTypes,osx.coreFoundation.CFError,osx.coreFoundation.CFNumber,osx.coreFoundation.CFRetainRelease,osx.coreFoundation.containers.OutOfBounds,osx.coreFoundation.containers.PointerSizedValues,security.insecureAPI.UncheckedReturn,security.insecureAPI.decodeValueOfObjCType,security.insecureAPI.getpw,security.insecureAPI.gets,security.insecureAPI.mkstemp,security.insecureAPI.mktemp,security.insecureAPI.vfork,unix.API,unix.Malloc,unix.MallocSizeof,unix.MismatchedDeallocator,unix.Vfork,unix.cstring.BadSizeArg,unix.cstring.NullArg")
+
+add_custom_target(ci_clang_analyze
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_analyze
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_analyze && ${SCAN_BUILD_TOOL} -enable-checker ${CLANG_ANALYZER_CHECKS} --use-c++=${CLANG_TOOL} -analyze-headers -o ${PROJECT_BINARY_DIR}/report ninja
+    COMMENT "Check code with Clang Analyzer"
+)
+
+###############################################################################
+# Check code with Cppcheck.
+###############################################################################
+
+add_custom_target(ci_cppcheck
+    COMMAND ${CPPCHECK_TOOL} --enable=warning --suppress=missingReturn --inline-suppr --inconclusive --force --std=c++11 ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp --error-exitcode=1
+    COMMENT "Check code with Cppcheck"
+)
+
+###############################################################################
+# Check code with cpplint.
+###############################################################################
+
+add_custom_target(ci_cpplint
+    COMMAND ${Python3_EXECUTABLE} ${CMAKE_SOURCE_DIR}/third_party/cpplint/cpplint.py --filter=-whitespace,-legal,-runtime/references,-runtime/explicit,-runtime/indentation_namespace,-readability/casting,-readability/nolint --quiet --recursive ${SRC_FILES}
+    COMMENT "Check code with cpplint"
+)
+
+###############################################################################
+# Check code with OCLint.
+###############################################################################
+
+file(COPY ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp DESTINATION ${PROJECT_BINARY_DIR}/src_single)
+file(RENAME ${PROJECT_BINARY_DIR}/src_single/json.hpp ${PROJECT_BINARY_DIR}/src_single/all.cpp)
+file(APPEND "${PROJECT_BINARY_DIR}/src_single/all.cpp" "\n\nint main()\n{}\n")
+
+add_executable(single_all ${PROJECT_BINARY_DIR}/src_single/all.cpp)
+target_compile_features(single_all PRIVATE cxx_std_11)
+
+add_custom_target(ci_oclint
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        -DJSON_BuildTests=OFF -DJSON_CI=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_oclint
+    COMMAND ${OCLINT_TOOL} -i ${PROJECT_BINARY_DIR}/build_oclint/src_single/all.cpp -p ${PROJECT_BINARY_DIR}/build_oclint --
+        -report-type html -enable-global-analysis --max-priority-1=0 --max-priority-2=1000 --max-priority-3=2000
+        --disable-rule=MultipleUnaryOperator
+        --disable-rule=DoubleNegative
+        --disable-rule=ShortVariableName
+        --disable-rule=GotoStatement
+        --disable-rule=LongLine
+        -o ${PROJECT_BINARY_DIR}/build_oclint/oclint_report.html
+    COMMENT "Check code with OCLint"
+)
+
+###############################################################################
+# Check code with Clang-Tidy.
+###############################################################################
+
+add_custom_target(ci_clang_tidy
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_CLANG_TIDY=${CLANG_TIDY_TOOL}
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_tidy
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_tidy
+    COMMENT "Check code with Clang-Tidy"
+)
+
+###############################################################################
+# Check code with PVS-Studio Analyzer <https://www.viva64.com/en/pvs-studio/>.
+###############################################################################
+
+add_custom_target(ci_pvs_studio
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_pvs_studio
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_pvs_studio && ${PVS_STUDIO_ANALYZER_TOOL} analyze -j 10
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_pvs_studio && ${PLOG_CONVERTER_TOOL} -a'GA:1,2;64:1;CS' -t fullhtml PVS-Studio.log -o pvs
+    COMMENT "Check code with PVS Studio"
+)
+
+###############################################################################
+# Check code with Infer <https://fbinfer.com> static analyzer.
+###############################################################################
+
+add_custom_target(ci_infer
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_infer
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_infer && ${INFER_TOOL} compile -- ${CMAKE_COMMAND} -DCMAKE_BUILD_TYPE=Debug ${PROJECT_SOURCE_DIR} -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_infer && ${INFER_TOOL} run -- make
+    COMMENT "Check code with Infer"
+)
+
+###############################################################################
+# Run test suite with previously downloaded test data.
+###############################################################################
+
+add_custom_target(ci_offline_testdata
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data && ${GIT_TOOL} clone -c advice.detachedHead=false --branch v3.0.0 https://github.com/nlohmann/json_test_data.git --quiet --depth 1
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_TestDataDirectory=${PROJECT_BINARY_DIR}/build_offline_testdata/test_data/json_test_data
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_offline_testdata
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_offline_testdata
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Check code with previously downloaded test data"
+)
+
+###############################################################################
+# Run test suite when project was not checked out from Git
+###############################################################################
+
+add_custom_target(ci_non_git_tests
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_non_git_tests/sources
+    COMMAND cd ${PROJECT_SOURCE_DIR} && for FILE in `${GIT_TOOL} ls-tree --name-only HEAD`\; do cp -r $$FILE ${PROJECT_BINARY_DIR}/build_non_git_tests/sources \; done
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_BINARY_DIR}/build_non_git_tests/sources -B${PROJECT_BINARY_DIR}/build_non_git_tests
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_non_git_tests
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_non_git_tests && ${CMAKE_CTEST_COMMAND} --parallel ${N} -LE git_required --output-on-failure
+    COMMENT "Check code when project was not checked out from Git"
+)
+
+###############################################################################
+# Run test suite and exclude tests that change installed files
+###############################################################################
+
+add_custom_target(ci_reproducible_tests
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_reproducible_tests
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_reproducible_tests
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_reproducible_tests && ${CMAKE_CTEST_COMMAND} --parallel ${N} -LE not_reproducible --output-on-failure
+    COMMENT "Check code and exclude tests that change installed files"
+)
+
+###############################################################################
+# Check if every header in the include folder includes sufficient headers to
+# be compiled individually.
+###############################################################################
+
+set(iwyu_path_and_options ${IWYU_TOOL} -Xiwyu --max_line_length=300)
+
+foreach(SRC_FILE ${SRC_FILES})
+    # get relative path of the header file
+    file(RELATIVE_PATH RELATIVE_SRC_FILE "${PROJECT_SOURCE_DIR}/include/nlohmann" "${SRC_FILE}")
+    # replace slashes and strip suffix
+    string(REPLACE "/" "_" RELATIVE_SRC_FILE "${RELATIVE_SRC_FILE}")
+    string(REPLACE ".hpp" "" RELATIVE_SRC_FILE "${RELATIVE_SRC_FILE}")
+    # create code file
+    file(WRITE "${PROJECT_BINARY_DIR}/src_single/${RELATIVE_SRC_FILE}.cpp" "#include \"${SRC_FILE}\" // IWYU pragma: keep\n\nint main()\n{}\n")
+    # create executable
+    add_executable(single_${RELATIVE_SRC_FILE} EXCLUDE_FROM_ALL ${PROJECT_BINARY_DIR}/src_single/${RELATIVE_SRC_FILE}.cpp)
+    target_include_directories(single_${RELATIVE_SRC_FILE} PRIVATE ${PROJECT_SOURCE_DIR}/include)
+    target_compile_features(single_${RELATIVE_SRC_FILE} PRIVATE cxx_std_11)
+    set_property(TARGET single_${RELATIVE_SRC_FILE} PROPERTY CXX_INCLUDE_WHAT_YOU_USE "${iwyu_path_and_options}")
+    # remember binary for ci_single_binaries target
+    list(APPEND single_binaries single_${RELATIVE_SRC_FILE})
+endforeach()
+
+add_custom_target(ci_single_binaries
+    DEPENDS ${single_binaries}
+    COMMENT "Check if headers are self-contained"
+)
+
+###############################################################################
+# Benchmarks
+###############################################################################
+
+add_custom_target(ci_benchmarks
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Release -GNinja
+        -S${PROJECT_SOURCE_DIR}/benchmarks -B${PROJECT_BINARY_DIR}/build_benchmarks
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_benchmarks --target json_benchmarks
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_benchmarks && ./json_benchmarks
+    COMMENT "Run benchmarks"
+)
+
+###############################################################################
+# CMake flags
+###############################################################################
+
+if (APPLE)
+    set(CMAKE_310_BINARY ${PROJECT_BINARY_DIR}/cmake-3.1.0-Darwin64/CMake.app/Contents/bin/cmake)
+    add_custom_command(
+        OUTPUT ${CMAKE_310_BINARY}
+        COMMAND wget https://github.com/Kitware/CMake/releases/download/v3.1.0/cmake-3.1.0-Darwin64.tar.gz
+        COMMAND tar xfz cmake-3.1.0-Darwin64.tar.gz
+        COMMAND rm cmake-3.1.0-Darwin64.tar.gz
+        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+        COMMENT "Download CMake 3.1.0"
+    )
+else()
+    set(CMAKE_310_BINARY ${PROJECT_BINARY_DIR}/cmake-3.1.0-Linux-x86_64/bin/cmake)
+    add_custom_command(
+        OUTPUT ${CMAKE_310_BINARY}
+        COMMAND wget https://github.com/Kitware/CMake/releases/download/v3.1.0/cmake-3.1.0-Linux-x86_64.tar.gz
+        COMMAND tar xfz cmake-3.1.0-Linux-x86_64.tar.gz
+        COMMAND rm cmake-3.1.0-Linux-x86_64.tar.gz
+        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+        COMMENT "Download CMake 3.1.0"
+    )
+endif()
+
+set(JSON_CMAKE_FLAGS "JSON_BuildTests;JSON_Install;JSON_MultipleHeaders;JSON_ImplicitConversions;JSON_Valgrind;JSON_Diagnostics;JSON_SystemInclude")
+
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS})
+    string(TOLOWER "ci_cmake_flag_${JSON_CMAKE_FLAG}" JSON_CMAKE_FLAG_TARGET)
+    add_custom_target("${JSON_CMAKE_FLAG_TARGET}"
+        COMMENT "Check CMake flag ${JSON_CMAKE_FLAG} (CMake ${CMAKE_VERSION})"
+        COMMAND ${CMAKE_COMMAND}
+            -Werror=dev
+            -D${JSON_CMAKE_FLAG}=ON
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}
+    )
+    add_custom_target("${JSON_CMAKE_FLAG_TARGET}_31"
+        COMMENT "Check CMake flag ${JSON_CMAKE_FLAG} (CMake 3.1)"
+        COMMAND mkdir ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}_31
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}_31 && ${CMAKE_310_BINARY}
+            -Werror=dev ${PROJECT_SOURCE_DIR}
+            -D${JSON_CMAKE_FLAG}=ON
+            -DCMAKE_CXX_COMPILE_FEATURES="cxx_range_for" -DCMAKE_CXX_FLAGS="-std=gnu++11"
+        DEPENDS ${CMAKE_310_BINARY}
+    )
+    list(APPEND JSON_CMAKE_FLAG_TARGETS ${JSON_CMAKE_FLAG_TARGET} ${JSON_CMAKE_FLAG_TARGET}_31)
+    list(APPEND JSON_CMAKE_FLAG_BUILD_DIRS ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET} ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}_31)
+endforeach()
+
+add_custom_target(ci_cmake_flags
+    DEPENDS ${JSON_CMAKE_FLAG_TARGETS}
+    COMMENT "Check CMake flags"
+)
+
+###############################################################################
+# Use more installed compilers.
+###############################################################################
+
+foreach(COMPILER g++-4.8 g++-4.9 g++-5 g++-6 g++-7 g++-8 g++-9 g++-10 clang++-3.5 clang++-3.6 clang++-3.7 clang++-3.8 clang++-3.9 clang++-4.0 clang++-5.0 clang++-6.0 clang++-7 clang++-8 clang++-9 clang++-10 clang++-11 clang++-12 clang++-13)
+    find_program(COMPILER_TOOL NAMES ${COMPILER})
+    if (COMPILER_TOOL)
+        if ("${COMPILER}" STREQUAL "clang++-9")
+            # fix for https://github.com/nlohmann/json/pull/3101#issuecomment-998788786 / https://stackoverflow.com/a/64051725/266378
+            set(ADDITIONAL_FLAGS "-DCMAKE_CXX_FLAGS=--gcc-toolchain=/root/gcc/9")
+        else()
+            unset(ADDITIONAL_FLAGS)
+        endif()
+
+        add_custom_target(ci_test_compiler_${COMPILER}
+            COMMAND CXX=${COMPILER} ${CMAKE_COMMAND}
+                -DCMAKE_BUILD_TYPE=Debug -GNinja
+                -DJSON_BuildTests=ON -DJSON_FastTests=ON
+                -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_compiler_${COMPILER}
+                ${ADDITIONAL_FLAGS}
+            COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_compiler_${COMPILER}
+            COMMAND cd ${PROJECT_BINARY_DIR}/build_compiler_${COMPILER} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --exclude-regex "test-unicode" --output-on-failure
+            COMMENT "Compile and test with ${COMPILER}"
+        )
+    endif()
+    unset(COMPILER_TOOL CACHE)
+endforeach()
+
+###############################################################################
+# CUDA example
+###############################################################################
+
+add_custom_target(ci_cuda_example
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_CUDA_HOST_COMPILER=g++-8
+        -S${PROJECT_SOURCE_DIR}/test/cuda_example -B${PROJECT_BINARY_DIR}/build_cuda_example
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_cuda_example
+)
+
+###############################################################################
+# Clean up all generated files.
+###############################################################################
+
+add_custom_target(ci_clean
+    COMMAND rm -fr ${PROJECT_BINARY_DIR}/build_* cmake-3.1.0-Darwin64 ${JSON_CMAKE_FLAG_BUILD_DIRS} ${single_binaries}
+    COMMENT "Clean generated directories"
+)
diff --git a/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/config.cmake.in b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/config.cmake.in
new file mode 100644
index 000000000..9a17a7d7b
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/config.cmake.in
@@ -0,0 +1,15 @@
+include(FindPackageHandleStandardArgs)
+set(${CMAKE_FIND_PACKAGE_NAME}_CONFIG ${CMAKE_CURRENT_LIST_FILE})
+find_package_handle_standard_args(@PROJECT_NAME@ CONFIG_MODE)
+
+if(NOT TARGET @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@)
+    include("${CMAKE_CURRENT_LIST_DIR}/@NLOHMANN_JSON_TARGETS_EXPORT_NAME@.cmake")
+    if((NOT TARGET @NLOHMANN_JSON_TARGET_NAME@) AND
+       (NOT @PROJECT_NAME@_FIND_VERSION OR
+        @PROJECT_NAME@_FIND_VERSION VERSION_LESS 3.2.0))
+        add_library(@NLOHMANN_JSON_TARGET_NAME@ INTERFACE IMPORTED)
+        set_target_properties(@NLOHMANN_JSON_TARGET_NAME@ PROPERTIES
+            INTERFACE_LINK_LIBRARIES @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@
+        )
+    endif()
+endif()
diff --git a/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/download_test_data.cmake b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/download_test_data.cmake
new file mode 100644
index 000000000..f516a7c3b
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/download_test_data.cmake
@@ -0,0 +1,56 @@
+set(JSON_TEST_DATA_URL     https://github.com/nlohmann/json_test_data)
+set(JSON_TEST_DATA_VERSION 3.0.0)
+
+# if variable is set, use test data from given directory rather than downloading them
+if(JSON_TestDataDirectory)
+    message(STATUS "Using test data in ${JSON_TestDataDirectory}.")
+    add_custom_target(download_test_data)
+    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${JSON_TestDataDirectory}\"\n")
+else()
+    find_package(Git)
+    # target to download test data
+    add_custom_target(download_test_data
+        COMMAND test -d json_test_data || ${GIT_EXECUTABLE} clone -c advice.detachedHead=false --branch v${JSON_TEST_DATA_VERSION} ${JSON_TEST_DATA_URL}.git --quiet --depth 1
+        COMMENT "Downloading test data from ${JSON_TEST_DATA_URL} (v${JSON_TEST_DATA_VERSION})"
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+    )
+    # create a header with the path to the downloaded test data
+    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${CMAKE_BINARY_DIR}/json_test_data\"\n")
+endif()
+
+# determine the operating system (for debug and support purposes)
+find_program(UNAME_COMMAND uname)
+find_program(VER_COMMAND ver)
+find_program(LSB_RELEASE_COMMAND lsb_release)
+find_program(SW_VERS_COMMAND sw_vers)
+set(OS_VERSION_STRINGS "${CMAKE_SYSTEM}")
+if (VER_COMMAND)
+    execute_process(COMMAND ${VER_COMMAND} OUTPUT_VARIABLE VER_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${VER_COMMAND_RESULT}")
+endif()
+if (SW_VERS_COMMAND)
+    execute_process(COMMAND ${SW_VERS_COMMAND} OUTPUT_VARIABLE SW_VERS_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    string(REGEX REPLACE "[ ]*\n" "; " SW_VERS_COMMAND_RESULT "${SW_VERS_COMMAND_RESULT}")
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${SW_VERS_COMMAND_RESULT}")
+endif()
+if (LSB_RELEASE_COMMAND)
+    execute_process(COMMAND ${LSB_RELEASE_COMMAND} -a OUTPUT_VARIABLE LSB_RELEASE_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    string(REGEX REPLACE "[ ]*\n" "; " LSB_RELEASE_COMMAND_RESULT "${LSB_RELEASE_COMMAND_RESULT}")
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${LSB_RELEASE_COMMAND_RESULT}")
+endif()
+if (UNAME_COMMAND)
+    execute_process(COMMAND ${UNAME_COMMAND} -a OUTPUT_VARIABLE UNAME_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${UNAME_COMMAND_RESULT}")
+endif()
+
+message(STATUS "Operating system: ${OS_VERSION_STRINGS}")
+
+# determine the compiler (for debug and support purposes)
+if (MSVC)
+    execute_process(COMMAND ${CMAKE_CXX_COMPILER} OUTPUT_VARIABLE CXX_VERSION_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_VARIABLE CXX_VERSION_RESULT ERROR_STRIP_TRAILING_WHITESPACE)
+    set(CXX_VERSION_RESULT "${CXX_VERSION_RESULT}; MSVC_VERSION=${MSVC_VERSION}; MSVC_TOOLSET_VERSION=${MSVC_TOOLSET_VERSION}")
+else()
+    execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE CXX_VERSION_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+string(REGEX REPLACE "[ ]*\n" "; " CXX_VERSION_RESULT "${CXX_VERSION_RESULT}")
+message(STATUS "Compiler: ${CXX_VERSION_RESULT}")
diff --git a/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/nlohmann_jsonConfigVersion.cmake.in b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/nlohmann_jsonConfigVersion.cmake.in
new file mode 100644
index 000000000..109108597
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/nlohmann_jsonConfigVersion.cmake.in
@@ -0,0 +1,20 @@
+# This is essentially cmake's BasicConfigVersion-SameMajorVersion.cmake.in but
+# without the 32/64-bit check.  Since json is a header-only library, it doesn't
+# matter if it was built on a different platform than what it is used on (see
+# https://github.com/nlohmann/json/issues/1697).
+set(PACKAGE_VERSION "@PROJECT_VERSION@")
+
+if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
+  set(PACKAGE_VERSION_COMPATIBLE FALSE)
+else()
+
+  if(PACKAGE_FIND_VERSION_MAJOR STREQUAL "@PROJECT_VERSION_MAJOR@")
+    set(PACKAGE_VERSION_COMPATIBLE TRUE)
+  else()
+    set(PACKAGE_VERSION_COMPATIBLE FALSE)
+  endif()
+
+  if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)
+      set(PACKAGE_VERSION_EXACT TRUE)
+  endif()
+endif()
diff --git a/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/pkg-config.pc.in b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/pkg-config.pc.in
new file mode 100644
index 000000000..d36317f09
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/cmake/pkg-config.pc.in
@@ -0,0 +1,4 @@
+Name: ${PROJECT_NAME}
+Description: JSON for Modern C++
+Version: ${PROJECT_VERSION}
+Cflags: -I${CMAKE_INSTALL_FULL_INCLUDEDIR}