From e8b7ea4356fdd3c4de5478f3418eb84f8dce2b61 Mon Sep 17 00:00:00 2001 From: Martin Liska Date: Tue, 26 May 2015 12:23:24 -0300 Subject: [PATCH] perf tools: Improve setting of gcc debug option Correct debugging experience is given by passing -Og to compiler. Do it in a way that supports older compilers Signed-off-by: Martin Liska Acked-by: Ingo Molnar Link: http://lkml.kernel.org/r/5564393C.1090104@suse.cz Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/config/Makefile | 2 ++ tools/perf/config/utilities.mak | 19 +++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile index e3b3724..317001c 100644 --- a/tools/perf/config/Makefile +++ b/tools/perf/config/Makefile @@ -130,6 +130,8 @@ endif ifeq ($(DEBUG),0) CFLAGS += -O6 +else + CFLAGS += $(call cc-option,-Og,-O0) endif ifdef PARSER_DEBUG diff --git a/tools/perf/config/utilities.mak b/tools/perf/config/utilities.mak index c16ce83..0ebef09 100644 --- a/tools/perf/config/utilities.mak +++ b/tools/perf/config/utilities.mak @@ -177,3 +177,22 @@ $(if $($(1)),$(call _ge_attempt,$($(1)),$(1)),$(call _ge_attempt,$(2))) endef _ge_attempt = $(if $(get-executable),$(get-executable),$(call _gea_err,$(2))) _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)) -- 2.7.4