perf tools: Pass EXTRA_CFLAGS through to libbpf build again

When perf was statically linked to libbpf, any definition of
EXTRA_CFLAGS passed to Makefile.perf propagated to the sub-make of
libbpf.  Since commit 9dabf4003423 ("perf python: Switch module to
linking libraries from building source"), EXTRA_CFLAGS is overridden
to "-fPIC" for the sub-make.

Change to include any user-provided EXTRA_CFLAGS before the "-fPIC"
option.

Fixes: 9dabf4003423 ("perf python: Switch module to linking libraries ...")
Signed-off-by: Ben Hutchings <benh@debian.org>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name perf-tools-pass-extra_cflags-through-to-libbpf-build-again.patch

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index bfa3e6ddb51fe13fc7fff31d0a6fc41b2951dfdb..a63873fd9f8b82538fdfcfe007b39c3e61a95a45 100644 (file)
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -953,7 +953,7 @@ $(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)