Aegisub/m4macros/ac_flag.m4

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AC_DEFUN([AC_C_FLAG], [{
AC_LANG_PUSH(C)
ac_c_flag_save="$CFLAGS"
CFLAGS="$CFLAGS $1"
AC_MSG_CHECKING([[whether $CC supports $1]])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]])],
[AC_MSG_RESULT([yes])],
[
CFLAGS="$ac_c_flag_save"
AC_MSG_RESULT([no])
$2
])
AC_LANG_POP(C)
}])
AC_DEFUN([AC_CXX_FLAG], [{
AC_LANG_PUSH(C++)
ac_cxx_flag_save="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $1"
AC_MSG_CHECKING([[whether $CXX supports $1]])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]])],
[AC_MSG_RESULT([yes])],
[
CXXFLAGS="$ac_cxx_flag_save"
AC_MSG_RESULT([no])
$2
])
AC_LANG_POP(C++)
}])