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[flang][CMake] CYGWIN requires _GNU_SOURCE to be defined. #66747

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[flang][CMake] CYGWIN requires _GNU_SOURCE to be defined. #66747

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8 changes: 8 additions & 0 deletions flang/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -326,6 +326,14 @@ else ()
add_compile_definitions(FLANG_LITTLE_ENDIAN=1)
endif ()

if (CYGWIN)
# On most UNIX like platforms g++ and clang++ define _GNU_SOURCE as a
# predefined macro, which turns on all of the wonderful libc extensions.
# However g++ doesn't do this in Cygwin so we have to define it ourselfs
# since we depend on GNU/POSIX/BSD extensions.
add_definitions(-D_GNU_SOURCE=1)
endif()

# Configure Flang's Version.inc file.
configure_file(
${CMAKE_CURRENT_SOURCE_DIR}/include/flang/Version.inc.in
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