Commit-ID: 01287e2cb7ad17b3d77751888d458a6b6a2bba15
Gitweb: http://git.kernel.org/tip/01287e2cb7ad17b3d77751888d458a6b6a2bba15
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Thu, 10 Oct 2013 08:58:57 +0200
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 14 Oct 2013 10:29:13 -0300
tools/perf/build: Remove the volatile-register-var feature check
Namhyung Kim noticed that the volatile-register-var feature check
is superfluous:
> The gcc manpage says this warning is enabled by -Wall, and we add -Wall
> to CFLAGS before doing feature checks. So all gcc versions that support
> -Wvolatile-register-var enables it by default without this check and
> older gcc versions will always fail the feature check.
Remove it - this will further speed up feature checks.
Reported-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/config/Makefile | 7 +------
tools/perf/config/feature-checks/Makefile | 8 ++------
2 files changed, 3 insertions(+), 12 deletions(-)
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index d207922..c516d6b 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -132,8 +132,7 @@ CORE_FEATURE_TESTS = \
libunwind \
on-exit \
stackprotector \
- stackprotector-all \
- volatile-register-var
+ stackprotector-all
#
# So here we detect whether test-all was rebuilt, to be able
@@ -203,10 +202,6 @@ ifeq ($(feature-stackprotector), 1)
CFLAGS += -Wstack-protector
endif
-ifeq ($(feature-volatile-register-var), 1)
- CFLAGS += -Wvolatile-register-var
-endif
-
ifeq ($(DEBUG),0)
ifeq ($(feature-fortify-source), 1)
CFLAGS += -D_FORTIFY_SOURCE=2
diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index cf33596..2eb8346 100644
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -25,8 +25,7 @@ FILES= \
test-libunwind \
test-on-exit \
test-stackprotector-all \
- test-stackprotector \
- test-volatile-register-var
+ test-stackprotector
CC := $(CC) -MD
@@ -37,7 +36,7 @@ BUILD = $(CC) $(LDFLAGS) -o $(OUTPUT)$@ $@.c
###############################
test-all:
- $(BUILD) -Werror -fstack-protector -fstack-protector-all -Wvolatile-register-var -O2 -Werror -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lunwind -lunwind-x86_64 -lelf -laudit -I/usr/include/slang -lslang $(shell pkg-config --libs --cflags gtk+-2.0 2>/dev/null) $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl
+ $(BUILD) -Werror -fstack-protector -fstack-protector-all -O2 -Werror -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lunwind -lunwind-x86_64 -lelf -laudit -I/usr/include/slang -lslang $(shell pkg-config --libs --cflags gtk+-2.0 2>/dev/null) $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl
test-hello:
$(BUILD)
@@ -48,9 +47,6 @@ test-stackprotector-all:
test-stackprotector:
$(BUILD) -Werror -fstack-protector
-test-volatile-register-var:
- $(BUILD) -Werror -Wvolatile-register-var
-
test-fortify-source:
$(BUILD) -O2 -Werror -D_FORTIFY_SOURCE=2
--
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