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Subject[096/143] perf tools: Add make DEBUG=1 to remove the -O6 cflag
2.6.32-longterm review patch.  If anyone has any objections, please let us know.

From: Steven Rostedt <>

commit 60d526f7fa6246b8e32d5b45610d625a5608d988 upstream.

When using gdb to debug perf, it is practically impossible to
use when perf is compiled with -O6. For developers, this patch
adds the DEBUG feature to the make command line so that a
developer can easily remove the optimization flag.

LKML-Reference: <1255590330.8392.446.camel@twins>
Signed-off-by: Steven Rostedt <>
Cc: Peter Zijlstra <>
Cc: Frederic Weisbecker <>
Cc: Arnaldo Carvalho de Melo <>
LKML-Reference: <>
Signed-off-by: Ingo Molnar <>
[bwh: Backport to 2.6.32]
Signed-off-by: Greg Kroah-Hartman <>
tools/perf/Makefile | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -200,7 +200,14 @@ EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wol
EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wstrict-prototypes
EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wdeclaration-after-statement

-CFLAGS = $(MBITS) -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -fstack-protector-all -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS)
+ifeq ("$(origin DEBUG)", "command line")
+ifndef PERF_DEBUG
+CFLAGS = $(MBITS) -ggdb3 -Wall -Wextra -std=gnu99 -Werror $(CFLAGS_OPTIMIZE) -fstack-protector-all -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS)
LDFLAGS = -lpthread -lrt -lelf -lm

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