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INCLUDE (CheckCXXSourceCompiles)
INCLUDE (ExternalProject)
SET(WITH_LIBFMT "auto" CACHE STRING
"Which libfmt to use (possible values are 'bundled', 'system', or 'auto')")
MACRO(BUNDLE_LIBFMT)
SET(dir "${CMAKE_BINARY_DIR}/extra/libfmt")
SET(LIBFMT_INCLUDE_DIR "${dir}/src/libfmt/include")
IF(CMAKE_VERSION VERSION_GREATER "3.0")
SET(fmt_byproducts BUILD_BYPRODUCTS ${LIBFMT_INCLUDE_DIR}/fmt/format-inl.h)
ENDIF()
ExternalProject_Add(
libfmt
PREFIX "${dir}"
URL "https://github.com/fmtlib/fmt/archive/refs/tags/8.0.1.zip"
URL_MD5 e77873199e897ca9f780479ad68e25b1
INSTALL_COMMAND ""
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
${fmt_byproducts}
)
ENDMACRO()
MACRO (CHECK_LIBFMT)
IF(WITH_LIBFMT STREQUAL "system" OR WITH_LIBFMT STREQUAL "auto")
SET(CMAKE_REQUIRED_INCLUDES ${LIBFMT_INCLUDE_DIR})
CHECK_CXX_SOURCE_COMPILES(
"#define FMT_STATIC_THOUSANDS_SEPARATOR ','
#define FMT_HEADER_ONLY 1
#include <fmt/format-inl.h>
#include <iostream>
int main() {
int answer= 42;
fmt::format_args::format_arg arg=
fmt::detail::make_arg<fmt::format_context>(answer);
std::cout << fmt::vformat(\"The answer is {}.\",
fmt::format_args(&arg, 1));
}" HAVE_SYSTEM_LIBFMT)
SET(CMAKE_REQUIRED_INCLUDES)
ENDIF()
IF(NOT HAVE_SYSTEM_LIBFMT OR WITH_LIBFMT STREQUAL "bundled")
IF (WITH_LIBFMT STREQUAL "system")
MESSAGE(FATAL_ERROR "system libfmt library is not found or unusable")
ENDIF()
BUNDLE_LIBFMT()
ELSE()
FIND_FILE(Libfmt_core_h fmt/core.h) # for build_depends.cmake
ENDIF()
ENDMACRO()
MARK_AS_ADVANCED(LIBFMT_INCLUDE_DIR)
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