From 1542428e49efefc79fdacc5797aee55722164987 Mon Sep 17 00:00:00 2001 From: Ingo Schwarze Date: Mon, 22 Jun 2020 20:00:38 +0000 Subject: Provide a real feature test for __attribute__(). Looking at version numbers like __GNUC__ is always a bad idea. Believe it or not, this even makes ./configure shorter by one line. --- test-attribute.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 test-attribute.c (limited to 'test-attribute.c') diff --git a/test-attribute.c b/test-attribute.c new file mode 100644 index 00000000..adbcc926 --- /dev/null +++ b/test-attribute.c @@ -0,0 +1,48 @@ +/* $Id: test-attribute.c,v 1.1 2020/06/22 20:00:38 schwarze Exp $ */ +/* + * Copyright (c) 2020 Ingo Schwarze + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include +#include +#include + +void var_arg(const char *, ...) + __attribute__((__format__ (__printf__, 1, 2))); +void no_ret(int) + __attribute__((__noreturn__)); + +void +var_arg(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vprintf(fmt, ap); + va_end(ap); +} + +void +no_ret(int i) +{ + exit(i); +} + +int +main(void) +{ + var_arg("Test output: %d\n", 42); + no_ret(0); +} -- cgit v1.2.3-56-ge451