[PATCH 1/3] perf build: Preserve EXTRA_CFLAGS when building in-tree libbpf

[Trevor Allison]

The libbpf sub-make passes EXTRA_CFLAGS="-fPIC", replacing the
parent EXTRA_CFLAGS.  Append -fPIC instead, since libbpf.a is linked
whole-archive into perf.

Signed-off-by: Trevor Allison <tallison@xxxxxxxxxx>
---
 tools/perf/Makefile.perf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 2b53d9e0c73b..a59ed1d70ecc 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -706,7 +706,7 @@ $(LIBAPI)-clean:
 $(LIBBPF): FORCE | $(LIBBPF_OUTPUT)
 	$(Q)$(MAKE) -C $(LIBBPF_DIR) FEATURES_DUMP=$(FEATURE_DUMP_EXPORT) \
 		O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= subdir= \
-		EXTRA_CFLAGS="-fPIC" $@ install_headers
+		EXTRA_CFLAGS="$(EXTRA_CFLAGS) -fPIC" $@ install_headers
 
 $(LIBBPF)-clean:
 	$(call QUIET_CLEAN, libbpf)
-- 
2.50.1 (Apple Git-155)