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# Functions to check for attributes support in compiler
AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [
AC_CACHE_CHECK([if compiler supports __attribute__((constructor))],
[cc_cv_attribute_constructor],
[AC_COMPILE_IFELSE([
void ctor() __attribute__((constructor));
void ctor() { };
],
[cc_cv_attribute_constructor=yes],
[cc_cv_attribute_constructor=no])
])
if test "x$cc_cv_attribute_constructor" = "xyes"; then
AC_DEFINE([SUPPORT_ATTRIBUTE_CONSTRUCTOR], 1, [Define this if the compiler supports the constructor attribute])
$1
else
true
$2
fi
])
AC_DEFUN([CC_ATTRIBUTE_FORMAT], [
AC_CACHE_CHECK([if compiler supports __attribute__((format(printf, n, n)))],
[cc_cv_attribute_format],
[AC_COMPILE_IFELSE([
void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { }
],
[cc_cv_attribute_format=yes],
[cc_cv_attribute_format=no])
])
if test "x$cc_cv_attribute_format" = "xyes"; then
AC_DEFINE([SUPPORT_ATTRIBUTE_FORMAT], 1, [Define this if the compiler supports the format attribute])
$1
else
true
$2
fi
])
AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [
AC_CACHE_CHECK([if compiler supports __attribute__((format_arg(printf)))],
[cc_cv_attribute_format_arg],
[AC_COMPILE_IFELSE([
void __attribute__((format_arg(printf, 1))) gettextlike(const char *fmt) { }
],
[cc_cv_attribute_format_arg=yes],
[cc_cv_attribute_format_arg=no])
])
if test "x$cc_cv_attribute_format_arg" = "xyes"; then
AC_DEFINE([SUPPORT_ATTRIBUTE_FORMAT_ARG], 1, [Define this if the compiler supports the format_arg attribute])
$1
else
true
$2
fi
])
AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [
AC_CACHE_CHECK([if compiler supports __attribute__((visibility("...")))],
[cc_cv_attribute_visibility],
[AC_COMPILE_IFELSE([
void __attribute__((visibility("internal"))) internal_function() { }
void __attribute__((visibility("hidden"))) hidden_function() { }
void __attribute__((visibility("default"))) external_function() { }
],
[cc_cv_attribute_visibility=yes],
[cc_cv_attribute_visibility=no])
])
if test "x$cc_cv_attribute_visibility" = "xyes"; then
AC_DEFINE([SUPPORT_ATTRIBUTE_VISIBILITY], 1, [Define this if the compiler supports the visibility attribute])
$1
else
true
$2
fi
])
AC_DEFUN([CC_FLAG_VISIBILITY], [
AC_CACHE_CHECK([if compiler supports -fvisibility=hidden],
[cc_cv_flag_visibility],
[
save_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS -fvisibility=hidden"
AC_COMPILE_IFELSE([int a;],
[cc_cv_flag_visibility=yes],
[cc_cv_flag_visibility=no])
CFLAGS="$save_CFLAGS"
])
if test "x$cc_cv_flag_visibility" = "xyes"; then
AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1, [Define this if the compiler supports the -fvisibility flag])
$1
else
true
$2
fi
])
AC_DEFUN([CC_ATTRIBUTE_NONNULL], [
AC_CACHE_CHECK([if compiler supports __attribute__((nonnull()))],
[cc_cv_attribute_nonnull],
[AC_COMPILE_IFELSE([
void some_function(void *foo, void *bar) __attribute__((nonnull()));
void some_function(void *foo, void *bar) { }
],
[cc_cv_attribute_nonnull=yes],
[cc_cv_attribute_nonnull=no])
])
if test "x$cc_cv_attribute_nonnull" = "xyes"; then
AC_DEFINE([SUPPORT_ATTRIBUTE_NONNULL], 1, [Define this if the compiler supports the nonnull attribute])
$1
else
true
$2
fi
])
AC_DEFUN([CC_ATTRIBUTE_UNUSED], [
AC_CACHE_CHECK([if compiler supports __attribute__((unused))],
[cc_cv_attribute_unused],
[AC_COMPILE_IFELSE([
void some_function(void *foo, __attribute__((unused)) void *bar);
],
[cc_cv_attribute_unused=yes],
[cc_cv_attribute_unused=no])
])
if test "x$cc_cv_attribute_unused" = "xyes"; then
AC_DEFINE([SUPPORT_ATTRIBUTE_UNUSED], 1, [Define this if the compiler supports the unused attribute])
$1
else
true
$2
fi
])
AC_DEFUN([CC_FUNC_EXPECT], [
AC_CACHE_CHECK([if compiler has __builtin_expect function],
[cc_cv_func_expect],
[AC_COMPILE_IFELSE([
int some_function()
{
int a = 3;
return (int)__builtin_expect(a, 3);
}
],
[cc_cv_func_expect=yes],
[cc_cv_func_expect=no])
])
if test "x$cc_cv_func_expect" = "xyes"; then
AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1, [Define this if the compiler supports __builtin_expect() function])
$1
else
true
$2
fi
])
|
