On Tue, Apr 23, 2024 at 12:03:08PM -0700, Sean Christopherson wrote: > Define _GNU_SOURCE is the base CFLAGS instead of relying on selftests to > manually #define _GNU_SOURCE, which is repetitive and error prone. E.g. > kselftest_harness.h requires _GNU_SOURCE for asprintf(), but if a selftest > includes kvm_test_harness.h after stdio.h, the include guards result in > the effective version of stdio.h consumed by kvm_test_harness.h not > defining asprintf(): > > In file included from x86_64/fix_hypercall_test.c:12: > In file included from include/kvm_test_harness.h:11: > ../kselftest_harness.h:1169:2: error: call to undeclared function > 'asprintf'; ISO C99 and later do not support implicit function declarations > [-Wimplicit-function-declaration] > 1169 | asprintf(&test_name, "%s%s%s.%s", f->name, > | ^ > > When including the rseq selftest's "library" code, #undef _GNU_SOURCE so > that rseq.c controls whether or not it wants to build with _GNU_SOURCE. > > Reported-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx> > Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> Acked-by: Oliver Upton <oliver.upton@xxxxxxxxx> -- Thanks, Oliver
