[PATCH v2 1/5] selftests: Compile kselftest headers with -D_GNU_SOURCE

[Mark Brown]

On Tue, May 07, 2024 at 09:38:26PM +0000, Edward Liaw wrote:
> Add the -D_GNU_SOURCE flag to KHDR_INCLUDES so that it is defined in a
> central location.
> 
> 809216233555 ("selftests/harness: remove use of LINE_MAX") introduced
> asprintf into kselftest_harness.h, which is a GNU extension and needs
> _GNU_SOURCE to either be defined prior to including headers or with the
> -D_GNU_SOURCE flag passed to the compiler.

Reviewed-by: Mark Brown <broonie at kernel.org>

This does mean we define _GNU_SOURCE for nolibc (and I guess any other
libc people use like bionic) but hopefully nobody's using the same
define with a different meaning so should be fine.
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