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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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