linux/tools/build/feature/test-get_current_dir_name.c

// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <unistd.h>
#include <stdlib.h>

int main(void)
{
	free(get_current_dir_name());
	return 0;
}
#undef _GNU_SOURCE
tools build feature: Check if get_current_dir_name() is available As the namespace support code will use this, which is not available in some non _GNU_SOURCE libraries such as Android's bionic used in my container build tests (r12b and r15c at the moment). Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-x56ypm940pwclwu45d7jfj47@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> 2018-11-20 03:56:22 +08:00			`// SPDX-License-Identifier: GPL-2.0`
			`#define _GNU_SOURCE`
			`#include <unistd.h>`
			`#include <stdlib.h>`

			`int main(void)`
			`{`
			`free(get_current_dir_name());`
			`return 0;`
			`}`
tools feature: Undef _GNU_SOURCE at the end of feature tests Since we get all the tests in a single .c file for a first test, tools/build/feature/test-all.c, if individual tests set that define and fail to undef it at its end, then it the test-all.c build will fail due to defining _GNU_SOURCE multiple times, getting us to the slow path, so undef it at the end in tests that define it. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-w6s00jfo1xabgphzczadl59b@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> 2019-02-12 20:56:57 +08:00			`#undef _GNU_SOURCE`