forked from mia/Aegisub
68 lines
1.6 KiB
Plaintext
68 lines
1.6 KiB
Plaintext
dnl AC_CPP_PRAGMA_ONCE
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dnl - check for #pragma once
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AC_DEFUN([AC_CPP_PRAGMA_ONCE], [{
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AC_MSG_CHECKING([[whether $CPP supports #pragma once]])
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AC_PREPROC_IFELSE(
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[AC_LANG_PROGRAM([[#pragma once]])],
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[
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AC_MSG_RESULT([yes])
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AC_DEFINE([HAVE_PRAGMA_ONCE], [1], [Preprocessor support for #pragma once])
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],
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[AC_MSG_RESULT([no])])
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}])
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dnl AC_C_FLAG([-flag])
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dnl - check for CFLAG support in CC
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AC_DEFUN([AC_C_FLAG], [{
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AC_LANG_PUSH(C)
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ac_c_flag_save="$CFLAGS"
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CFLAGS="$CFLAGS $1"
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AC_MSG_CHECKING([[whether $CC supports $1]])
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[]])],
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[
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AC_MSG_RESULT([yes])
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m4_if([$3], [], [], [
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CFLAGS="$ac_c_flag_save"
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$3
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])
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], [
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CFLAGS="$ac_c_flag_save"
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AC_MSG_RESULT([no])
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$2
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])
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AC_LANG_POP(C)
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}])
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dnl AC_C_FLAG([-flag])
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dnl - check for CFLAG support in CC
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AC_DEFUN([AC_GCC_VISIBILITY], [{
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AC_MSG_CHECKING([[whether $CC supports GCC visibility]])
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# always use Werror since visibility is sensitive
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# doesn't work on anything other than gcc either way, so Werror is fine...
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vis_type="$1"
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save_cflags="$CFLAGS"
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CFLAGS="$CFLAGS -fvisibility=$vis_type -Werror"
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AC_LINK_IFELSE(
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[AC_LANG_SOURCE([[
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int a() __attribute__((visibility("default")));
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int b() __attribute__((visibility("hidden")));
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int c() __attribute__((visibility("internal")));
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int a() { return 1; }
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int b() { return 2; }
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int c() { return 3; }
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int main() { return a()+b()+c(); }
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]])],
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[
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AC_MSG_RESULT([yes])
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AC_DEFINE([HAVE_GCC_VISIBILITY], [1], [Compiler support for GCC visibility attributes])
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save_cflags="$save_cflags -fvisibility=$vis_type"
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],
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[AC_MSG_RESULT([no])]
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)
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CFLAGS="$save_cflags"
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}])
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