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Code Packages Releases Wiki Activity

Detect used C++ standard library (#4793)

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This commit is contained in:
Niels Lohmann
2025-05-23 17:59:52 +02:00
committed by GitHub
parent 7421ac31a7
commit 281d1e929b
3 changed files with 50 additions and 2 deletions
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cmake/download_test_data.cmake
+15
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@@ -54,3 +54,18 @@ else()
endif()
string(REGEX REPLACE "[ ]*\n" "; " CXX_VERSION_RESULT "${CXX_VERSION_RESULT}")
message(STATUS "Compiler: ${CXX_VERSION_RESULT}")
# determine used C++ standard library (for debug and support purposes)
if(NOT DEFINED LIBCPP_VERSION_OUTPUT_CACHED)
try_run(RUN_RESULT_VAR COMPILE_RESULT_VAR
"${CMAKE_BINARY_DIR}" SOURCES "${CMAKE_SOURCE_DIR}/cmake/detect_libcpp_version.cpp"
RUN_OUTPUT_VARIABLE LIBCPP_VERSION_OUTPUT COMPILE_OUTPUT_VARIABLE LIBCPP_VERSION_COMPILE_OUTPUT
)
if(NOT LIBCPP_VERSION_OUTPUT)
set(LIBCPP_VERSION_OUTPUT "Unknown")
message(AUTHOR_WARNING "Failed to compile cmake/detect_libcpp_version to detect the used C++ standard library. This does not affect the library or the test cases. Please still create an issue at https://github.com/nlohmann/json to investigate this.\n${LIBCPP_VERSION_COMPILE_OUTPUT}")
endif()
set(LIBCPP_VERSION_OUTPUT_CACHED "${LIBCPP_VERSION_OUTPUT}" CACHE STRING "Detected C++ standard library version")
endif()
message(STATUS "C++ standard library: ${LIBCPP_VERSION_OUTPUT_CACHED}")