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author | 2020-06-22 20:00:38 +0000 | |
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committer | 2020-06-22 20:00:38 +0000 | |
commit | 1542428e49efefc79fdacc5797aee55722164987 (patch) | |
tree | c5f0a628164575199aecebcebf108a089efa1aad /test-attribute.c | |
parent | e6e331420a7d737bb26d35ecef4180cc569577a4 (diff) | |
download | mandoc-1542428e49efefc79fdacc5797aee55722164987.tar.gz mandoc-1542428e49efefc79fdacc5797aee55722164987.tar.zst mandoc-1542428e49efefc79fdacc5797aee55722164987.zip |
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.
Diffstat (limited to 'test-attribute.c')
-rw-r--r-- | test-attribute.c | 48 |
1 files changed, 48 insertions, 0 deletions
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 <schwarze@openbsd.org> + * + * 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 <stdarg.h> +#include <stdio.h> +#include <stdlib.h> + +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); +} |