1 files changed, 85 insertions, 0 deletions
diff --git a/cmake/modules/BuildOpentelemetry.cmake b/cmake/modules/BuildOpentelemetry.cmake
new file mode 100644
index 000000000..ba2edaa09
--- /dev/null
+++ b/cmake/modules/BuildOpentelemetry.cmake
@@ -0,0 +1,85 @@
+function(target_create _target _lib)
+  add_library(${_target} STATIC IMPORTED)
+  set_target_properties(
+    ${_target} PROPERTIES IMPORTED_LOCATION
+                          "${opentelemetry_BINARY_DIR}/${_lib}")
+endfunction()
+
+function(build_opentelemetry)
+  set(opentelemetry_SOURCE_DIR "${PROJECT_SOURCE_DIR}/src/jaegertracing/opentelemetry-cpp")
+  set(opentelemetry_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/opentelemetry-cpp")
+  set(opentelemetry_cpp_targets opentelemetry_trace opentelemetry_exporter_jaeger_trace)
+  set(opentelemetry_CMAKE_ARGS -DCMAKE_POSITION_INDEPENDENT_CODE=ON
+                               -DWITH_JAEGER=ON
+                               -DBUILD_TESTING=OFF
+                               -DCMAKE_BUILD_TYPE=Release
+                               -DWITH_EXAMPLES=OFF)
+
+  set(opentelemetry_libs
+      ${opentelemetry_BINARY_DIR}/sdk/src/trace/libopentelemetry_trace.a
+      ${opentelemetry_BINARY_DIR}/sdk/src/resource/libopentelemetry_resources.a
+      ${opentelemetry_BINARY_DIR}/sdk/src/common/libopentelemetry_common.a
+      ${opentelemetry_BINARY_DIR}/exporters/jaeger/libopentelemetry_exporter_jaeger_trace.a
+      ${opentelemetry_BINARY_DIR}/ext/src/http/client/curl/libopentelemetry_http_client_curl.a
+      ${CURL_LIBRARIES}
+  )
+  set(opentelemetry_include_dir ${opentelemetry_SOURCE_DIR}/api/include/
+                                ${opentelemetry_SOURCE_DIR}/exporters/jaeger/include/
+                                ${opentelemetry_SOURCE_DIR}/ext/include/
+                                ${opentelemetry_SOURCE_DIR}/sdk/include/)
+  # TODO: add target based propogation
+  set(opentelemetry_deps opentelemetry_trace opentelemetry_resources opentelemetry_common
+                         opentelemetry_exporter_jaeger_trace http_client_curl
+			 ${CURL_LIBRARIES})
+
+  if(CMAKE_MAKE_PROGRAM MATCHES "make")
+    # try to inherit command line arguments passed by parent "make" job
+    set(make_cmd $(MAKE) ${opentelemetry_cpp_targets})
+  else()
+    set(make_cmd ${CMAKE_COMMAND} --build <BINARY_DIR> --target
+                 ${opentelemetry_cpp_targets})
+  endif()
+
+  if(WITH_SYSTEM_BOOST)
+    list(APPEND opentelemetry_CMAKE_ARGS -DBOOST_ROOT=${BOOST_ROOT})
+  else()
+    list(APPEND dependencies Boost)
+    list(APPEND opentelemetry_CMAKE_ARGS -DBoost_INCLUDE_DIR=${CMAKE_BINARY_DIR}/boost/include)
+  endif()
+
+  include(ExternalProject)
+  ExternalProject_Add(opentelemetry-cpp
+    SOURCE_DIR ${opentelemetry_SOURCE_DIR}
+    PREFIX "opentelemetry-cpp"
+    CMAKE_ARGS ${opentelemetry_CMAKE_ARGS}
+    BUILD_COMMAND ${make_cmd}
+    BINARY_DIR ${opentelemetry_BINARY_DIR}
+    INSTALL_COMMAND ""
+    BUILD_BYPRODUCTS ${opentelemetry_libs}
+    DEPENDS ${dependencies}
+    LOG_BUILD ON)
+
+  # CMake doesn't allow to add a list of libraries to the import property, hence
+  # we create individual targets and link their libraries which finally
+  # interfaces to opentelemetry target
+  target_create("opentelemetry_trace" "sdk/src/trace/libopentelemetry_trace.a")
+  target_create("opentelemetry_resources"
+                "sdk/src/resource/libopentelemetry_resources.a")
+  target_create("opentelemetry_common"
+                "sdk/src/common/libopentelemetry_common.a")
+  target_create("opentelemetry_exporter_jaeger_trace"
+                "exporters/jaeger/libopentelemetry_exporter_jaeger_trace.a")
+  target_create("http_client_curl"
+                "ext/src/http/client/curl/libopentelemetry_http_client_curl.a")
+
+  # will do all linking and path setting fake include path for
+  # interface_include_directories since this happens at build time
+  file(MAKE_DIRECTORY ${opentelemetry_include_dir})
+  add_library(opentelemetry::libopentelemetry INTERFACE IMPORTED)
+  add_dependencies(opentelemetry::libopentelemetry opentelemetry-cpp)
+  set_target_properties(
+    opentelemetry::libopentelemetry
+    PROPERTIES
+      INTERFACE_LINK_LIBRARIES "${opentelemetry_deps}"
+      INTERFACE_INCLUDE_DIRECTORIES "${opentelemetry_include_dir}")
+endfunction()