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 <namhy...@kernel.org>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: David Ahern <dsah...@gmail.com>
Cc: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
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 587dd7e..d38119f 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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