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.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 39f4a913
...@@ -8,3 +8,4 @@ int main(void) ...@@ -8,3 +8,4 @@ int main(void)
free(get_current_dir_name()); free(get_current_dir_name());
return 0; return 0;
} }
#undef _GNU_SOURCE
...@@ -7,3 +7,4 @@ int main(void) ...@@ -7,3 +7,4 @@ int main(void)
return 0; return 0;
} }
#undef _GNU_SOURCE
...@@ -5,3 +5,4 @@ int main(void) ...@@ -5,3 +5,4 @@ int main(void)
{ {
return setns(0, 0); return setns(0, 0);
} }
#undef _GNU_SOURCE
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