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  • # Helper function to check for gcc attributes.
    
    # AST_GCC_ATTRIBUTE([attribute name], [attribute syntax], [attribute scope], [makeopts flag])
    
    
    AC_DEFUN([AST_GCC_ATTRIBUTE],
    [
    AC_MSG_CHECKING(for compiler 'attribute $1' support)
    saved_CFLAGS="$CFLAGS"
    
    CFLAGS="$CFLAGS -Wall -Wno-unused -Werror"
    
    ax_cv_have_func_attribute_$1=0
    
    AC_COMPILE_IFELSE(
    
    	[AC_LANG_PROGRAM(
    
    		m4_ifval([$2],
    			[$3 void __attribute__(($2)) *test(void *muffin, ...) ;],
    			[$3 void __attribute__(($1)) *test(void *muffin, ...) {return (void *) 0;}]))],
    
    	AC_MSG_RESULT(yes)
    
    	ax_cv_have_func_attribute_$1=1
    
    	AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_$1], 1, [Define to 1 if your GCC C compiler supports the '$1' attribute.]),
    
    CFLAGS="$saved_CFLAGS"