linux-kernel - [PATCH] perf: turn off compiler warnings for flex and bison generated files

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Date:	Fri, 4 May 2012 11:32:54 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] perf: turn off compiler warnings for flex and bison
 generated files

We don't know what types of warnings different versions of flex and bison
combined with different versions of gcc is going to generate, so just punt and
don't warn about anything.

This fixes the build of perf for me on an openSUSE 12.1 system.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
Note, I don't really like this, but how else are we going to ensure that we
catch all warnings?  Pick them off one by one?  Better ideas are
accepted, but something needs to be done soon, you don't want this
broken for 3.4.

 tools/perf/Makefile |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 9bf3fc7..92271d3 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -774,10 +774,10 @@ $(OUTPUT)perf.o perf.spec \
 # over the general rule for .o
 
 $(OUTPUT)util/%-flex.o: $(OUTPUT)util/%-flex.c $(OUTPUT)PERF-CFLAGS
-	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -Iutil/ -Wno-redundant-decls -Wno-switch-default -Wno-unused-function $<
+	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -Iutil/ -w $<
 
 $(OUTPUT)util/%-bison.o: $(OUTPUT)util/%-bison.c $(OUTPUT)PERF-CFLAGS
-	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -Iutil/ -Wno-redundant-decls -Wno-switch-default -Wno-unused-function $<
+	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -Iutil/ -w $<
 
 $(OUTPUT)%.o: %.c $(OUTPUT)PERF-CFLAGS
 	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) $<
--
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