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[cmake] add dynamic check for libstdc++fs #796

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[cmake] add dynamic check for libstdc++fs #796

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13 changes: 11 additions & 2 deletions lib/CppInterOp/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -54,8 +54,17 @@ if(NOT WIN32 AND NOT EMSCRIPTEN)
list(APPEND link_libs dl)
endif()

if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
list(APPEND link_libs stdc++fs)
# Check if we need to link -lstdc++fs to use <filesystem> (libstdc++ 8 and older).
include(CheckCXXSourceCompiles)
set(_filesystem_src "#include <filesystem>
int main() { std::filesystem::path p = \"path\"; return 0; }")
check_cxx_source_compiles("${_filesystem_src}" HAVE_NATIVE_FILESYSTEM)
if(NOT HAVE_NATIVE_FILESYSTEM)
set(CMAKE_REQUIRED_LIBRARIES stdc++fs)
check_cxx_source_compiles("${_filesystem_src}" NEED_STDCXXFS)
if(NEED_STDCXXFS)
list(APPEND link_libs stdc++fs)
endif()
endif()

# Get rid of libLLVM-X.so which is appended to the list of static libraries.
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