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perf tools: Add 'make DEBUG=1' to remove the -O6 cflag
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 <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <20091020232033.984323261@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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1 changed files with 8 additions and 1 deletions
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@ -201,7 +201,14 @@ EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wold-style-definition
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wstrict-prototypes
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wdeclaration-after-statement
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CFLAGS = $(MBITS) -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -fstack-protector-all -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS)
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ifeq ("$(origin DEBUG)", "command line")
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PERF_DEBUG = $(DEBUG)
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endif
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ifndef PERF_DEBUG
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CFLAGS_OPTIMIZE = -O6
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endif
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CFLAGS = $(MBITS) -ggdb3 -Wall -Wextra -std=gnu99 -Werror $(CFLAGS_OPTIMIZE) -fstack-protector-all -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS)
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LDFLAGS = -lpthread -lrt -lelf -lm
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ALL_CFLAGS = $(CFLAGS)
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ALL_LDFLAGS = $(LDFLAGS)
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