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3021e01559
We now use this to set certain options, if supported by the compilers (C/C++). Currently we enable various options, like -Wno-format-truncation. We use this to ignore complaints about possibly truncations due to the use of the snprintf() family of functions - where forced truncation is the whole point.
40 lines
1 KiB
Text
40 lines
1 KiB
Text
dnl From stackoverflow, with some changes
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dnl @synopsis CXX_FLAGS_CHECK [compiler flags]
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dnl @summary check whether compiler supports given C++ flags or not
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AC_DEFUN([CXX_FLAG_CHECK],
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[dnl
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AC_MSG_CHECKING([if $CXX supports $1])
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AC_LANG_PUSH([C++])
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ac_saved_cxxflags="$CXX_COMPILER_FLAGS"
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CXX_COMPILER_FLAGS="-Werror $1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
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[cxx_flag_check=yes],
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[cxx_flag_check=no]
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)
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AC_MSG_RESULT([$cxx_flag_check])
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CXX_COMPILER_FLAGS="$ac_saved_cxxflags"
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if test "$cxx_flag_check" = yes
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then
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CXX_COMPILER_FLAGS="$CXX_COMPILER_FLAGS $1"
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fi
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AC_LANG_POP([C++])
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])
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AC_DEFUN([C_FLAG_CHECK],
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[dnl
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AC_MSG_CHECKING([if $CC supports $1])
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AC_LANG_PUSH([C])
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ac_saved_ccflags="$C_COMPILER_FLAGS"
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C_COMPILER_FLAGS="-Werror $1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
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[cc_flag_check=yes],
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[cc_flag_check=no]
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)
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AC_MSG_RESULT([$cc_flag_check])
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C_COMPILER_FLAGS="$ac_saved_ccflags"
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if test "$cc_flag_check" = yes
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then
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C_COMPILER_FLAGS="$C_COMPILER_FLAGS $1"
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fi
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AC_LANG_POP([C])
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])
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