* [tip:perf/urgent] perf build: Do not use -Wshadow on gcc < 4.8
[not found] <20190719183417.GQ3624@kernel.org>
@ 2019-07-23 21:53 ` tip-bot for Arnaldo Carvalho de Melo
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From: tip-bot for Arnaldo Carvalho de Melo @ 2019-07-23 21:53 UTC (permalink / raw)
To: linux-tip-commits
Cc: tglx, mingo, adrian.hunter, hpa, acme, jolsa, namhyung,
andrii.nakryiko, linux-kernel
Commit-ID: 39e7317e37f7f0be366d1201c283f968c17268da
Gitweb: https://git.kernel.org/tip/39e7317e37f7f0be366d1201c283f968c17268da
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Fri, 19 Jul 2019 15:34:30 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 23 Jul 2019 09:04:54 -0300
perf build: Do not use -Wshadow on gcc < 4.8
As it is too strict, see https://lkml.org/lkml/2006/11/28/253 and
https://gcc.gnu.org/gcc-4.8/changes.html, that takes into account
Linus's comments (search for Wshadow) for the reasoning about -Wshadow
not being interesting before gcc 4.8.
Acked-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/r/20190719183417.GQ3624@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/scripts/Makefile.include | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index 495066bafbe3..ded7a950dc40 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -32,7 +32,6 @@ EXTRA_WARNINGS += -Wno-system-headers
EXTRA_WARNINGS += -Wold-style-definition
EXTRA_WARNINGS += -Wpacked
EXTRA_WARNINGS += -Wredundant-decls
-EXTRA_WARNINGS += -Wshadow
EXTRA_WARNINGS += -Wstrict-prototypes
EXTRA_WARNINGS += -Wswitch-default
EXTRA_WARNINGS += -Wswitch-enum
@@ -69,8 +68,16 @@ endif
# will do for now and keep the above -Wstrict-aliasing=3 in place
# in newer systems.
# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
+#
+# See https://lkml.org/lkml/2006/11/28/253 and https://gcc.gnu.org/gcc-4.8/changes.html,
+# that takes into account Linus's comments (search for Wshadow) for the reasoning about
+# -Wshadow not being interesting before gcc 4.8.
+
ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
EXTRA_WARNINGS += -fno-strict-aliasing
+EXTRA_WARNINGS += -Wno-shadow
+else
+EXTRA_WARNINGS += -Wshadow
endif
ifneq ($(findstring $(MAKEFLAGS), w),w)
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