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CMake: Use toolchain info for system includes
CMake already provides `CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES`, so there's no need to invoke the compiler to determine system include directories. For the Clang tool based header generator, adding the includes from the current toolchain is strictly more correct than having it try and figure them out itself (which will favor files from any installed libc++ and/or Clang). PiperOrigin-RevId: 531207747 Change-Id: Icfcf7b495a0a5782c21a665984d9039d365db898
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@ -153,10 +153,13 @@ function(add_sapi_library)
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"--sapi_ns=${_sapi_NAMESPACE}"
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)
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if(SAPI_ENABLE_CLANG_TOOL)
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set(_sapi_isystem_args ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
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list(TRANSFORM _sapi_isystem_args PREPEND --extra-arg-before=-isystem)
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list(APPEND _sapi_generator_command
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sapi_generator_tool
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-p "${CMAKE_CURRENT_BINARY_DIR}"
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${_sapi_generator_args}
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${_sapi_isystem_args}
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${_sapi_full_inputs}
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)
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add_custom_command(
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@ -179,9 +182,8 @@ function(add_sapi_library)
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add_custom_command(
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OUTPUT "${_sapi_gen_header}" "${_sapi_isystem}"
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COMMAND sh -c
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"${CMAKE_CXX_COMPILER} -E -x c++ -v /dev/null 2>&1 | \
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awk '/> search starts here:/{f=1;next}/^End of search/{f=0}f{print $1}' \
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> \"${_sapi_isystem}\""
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"printf '${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES}' | \
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sed \"s/;/\\n/g\" > \"${_sapi_isystem}\""
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COMMAND ${_sapi_generator_command}
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COMMENT "Generating interface"
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DEPENDS ${_sapi_INPUTS}
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