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tools/perf/build: Remove the volatile-register-var feature check

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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@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ingo Molnar 2013-10-10 08:58:57 +02:00 committed by Arnaldo Carvalho de Melo
parent 5f36978ca5
commit 01287e2cb7
2 changed files with 3 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
tools/perf/config/Makefile
View File

@ -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

8
tools/perf/config/feature-checks/Makefile
View File

@ -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