1 # Helper function to check for gcc attributes.
2 # AST_GCC_ATTRIBUTE([attribute name], [attribute syntax], [attribute scope], [makeopts flag])
4 AC_DEFUN([AST_GCC_ATTRIBUTE],
6 AC_MSG_CHECKING(for compiler 'attribute $1' support)
8 CFLAGS="$CFLAGS -Wall -Wno-unused -Werror"
10 ax_cv_have_func_attribute_$1=0
15 [$3 void __attribute__(($2)) *test(void *muffin, ...) ;],
16 [$3 void __attribute__(($1)) *test(void *muffin, ...) {return (void *) 0;}]))],
19 ax_cv_have_func_attribute_$1=1
20 AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_$1], 1, [Define to 1 if your GCC C compiler supports the '$1' attribute.]),
24 m4_ifval([$4],[AC_SUBST($4)])
25 CFLAGS="$saved_CFLAGS"