linux-kernel - [tip:perf/urgent] perf build: Do not use -Wshadow on gcc

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Message-ID: <tip-39e7317e37f7f0be366d1201c283f968c17268da@git.kernel.org>
Date:   Tue, 23 Jul 2019 14:53:00 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...nel.org, adrian.hunter@...el.com,
        hpa@...or.com, acme@...hat.com, jolsa@...nel.org,
        namhyung@...nel.org, andrii.nakryiko@...il.com,
        linux-kernel@...r.kernel.org
Subject: [tip:perf/urgent] perf build: Do not use -Wshadow on gcc < 4.8

Commit-ID:  39e7317e37f7f0be366d1201c283f968c17268da
Gitweb:     https://git.kernel.org/tip/39e7317e37f7f0be366d1201c283f968c17268da
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Fri, 19 Jul 2019 15:34:30 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.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@...il.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: https://lkml.kernel.org/r/20190719183417.GQ3624@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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)