28 lines
1.0 KiB
CMake
28 lines
1.0 KiB
CMake
include(CheckCXXCompilerFlag)
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macro (append_compile_flag _flag)
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string (MAKE_C_IDENTIFIER ${_flag} _name)
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if (NOT DEFINED compile_flag_${_name})
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# If we have an argument of the form "-Wno-foo" then we can't test it
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# directly as GCC will unconditioally succeed right up until the
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# point any other warning or error is triggered and *then* dump a
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# warning message.
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#
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# Instead you have to test for -Wfoo and only if that succeeds can
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# you use the negation.
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string (REGEX MATCH "^-Wno-(.+)$" compile_flag_inverse ${_flag})
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if ("x" STREQUAL "x${compile_flag_inverse}")
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check_cxx_compiler_flag (${_flag} compile_flag${_name})
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else ()
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string (REGEX REPLACE "-Wno-" "" _inverse_flag ${_flag})
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check_cxx_compiler_flag ("-W${_inverse_flag}" compile_flag${_name})
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endif ()
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endif ()
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if (compile_flag${_name})
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set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}")
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endif()
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endmacro(append_compile_flag)
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