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perf tools: Improve setting of gcc debug option

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Correct debugging experience is given by passing -Og to compiler.

Do it in a way that supports older compilers

Signed-off-by: Martin Liska <mliska@suse.cz>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/5564393C.1090104@suse.cz
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Martin Liska 2015-05-26 12:23:24 -03:00 committed by Arnaldo Carvalho de Melo
parent 5bcaaca3e4
commit e8b7ea4356
2 changed files with 21 additions and 0 deletions
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2
tools/perf/config/Makefile
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@ -130,6 +130,8 @@ endif
ifeq ($(DEBUG),0) ifeq ($(DEBUG),0)
CFLAGS += -O6 CFLAGS += -O6
else
CFLAGS += $(call cc-option,-Og,-O0)
endif endif
ifdef PARSER_DEBUG ifdef PARSER_DEBUG

19
tools/perf/config/utilities.mak
View File

@ -177,3 +177,22 @@ $(if $($(1)),$(call _ge_attempt,$($(1)),$(1)),$(call _ge_attempt,$(2)))
endef endef
_ge_attempt = $(if $(get-executable),$(get-executable),$(call _gea_err,$(2))) _ge_attempt = $(if $(get-executable),$(get-executable),$(call _gea_err,$(2)))
_gea_err = $(if $(1),$(error Please set '$(1)' appropriately)) _gea_err = $(if $(1),$(error Please set '$(1)' appropriately))
# try-run
# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
# Exit code chooses option. "$$TMP" is can be used as temporary file and
# is automatically cleaned up.
try-run = $(shell set -e; \
TMP="$(TMPOUT).$$$$.tmp"; \
TMPO="$(TMPOUT).$$$$.o"; \
if ($(1)) >/dev/null 2>&1; \
then echo "$(2)"; \
else echo "$(3)"; \
fi; \
rm -f "$$TMP" "$$TMPO")
# cc-option
# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
cc-option = $(call try-run,\
$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))