| Message ID | 20210319165334.29213-2-andre.przywara@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | kselftest/arm64: mte: Fix feature detection and compilation | expand |
On Fri, Mar 19, 2021 at 9:53 AM Andre Przywara <andre.przywara@arm.com> wrote: > > The mte selftest Makefile contains a check for GCC, to add the memtag > -march flag to the compiler options. This check fails if the compiler > is not explicitly specified, so reverts to the standard "cc", in which > case --version doesn't mention the "gcc" string we match against: > $ cc --version | head -n 1 > cc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 > > This will not add the -march switch to the command line, so compilation > fails: > mte_helper.S: Assembler messages: > mte_helper.S:25: Error: selected processor does not support `irg x0,x0,xzr' > mte_helper.S:38: Error: selected processor does not support `gmi x1,x0,xzr' > ... > > Actually clang accepts the same -march option as well, so we can just > drop this check and add this unconditionally to the command line, to avoid > any future issues with this check altogether (gcc actually prints > basename(argv[0]) when called with --version). > > Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> > --- > tools/testing/selftests/arm64/mte/Makefile | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/tools/testing/selftests/arm64/mte/Makefile b/tools/testing/selftests/arm64/mte/Makefile > index 0b3af552632a..df15d44aeb8d 100644 > --- a/tools/testing/selftests/arm64/mte/Makefile > +++ b/tools/testing/selftests/arm64/mte/Makefile > @@ -6,9 +6,7 @@ SRCS := $(filter-out mte_common_util.c,$(wildcard *.c)) > PROGS := $(patsubst %.c,%,$(SRCS)) > > #Add mte compiler option > -ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep gcc),) > CFLAGS += -march=armv8.5-a+memtag > -endif > > #check if the compiler works well > mte_cc_support := $(shell if ($(CC) $(CFLAGS) -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi) > -- > 2.17.5 >
diff --git a/tools/testing/selftests/arm64/mte/Makefile b/tools/testing/selftests/arm64/mte/Makefile index 0b3af552632a..df15d44aeb8d 100644 --- a/tools/testing/selftests/arm64/mte/Makefile +++ b/tools/testing/selftests/arm64/mte/Makefile @@ -6,9 +6,7 @@ SRCS := $(filter-out mte_common_util.c,$(wildcard *.c)) PROGS := $(patsubst %.c,%,$(SRCS)) #Add mte compiler option -ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep gcc),) CFLAGS += -march=armv8.5-a+memtag -endif #check if the compiler works well mte_cc_support := $(shell if ($(CC) $(CFLAGS) -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi)
The mte selftest Makefile contains a check for GCC, to add the memtag -march flag to the compiler options. This check fails if the compiler is not explicitly specified, so reverts to the standard "cc", in which case --version doesn't mention the "gcc" string we match against: $ cc --version | head -n 1 cc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 This will not add the -march switch to the command line, so compilation fails: mte_helper.S: Assembler messages: mte_helper.S:25: Error: selected processor does not support `irg x0,x0,xzr' mte_helper.S:38: Error: selected processor does not support `gmi x1,x0,xzr' ... Actually clang accepts the same -march option as well, so we can just drop this check and add this unconditionally to the command line, to avoid any future issues with this check altogether (gcc actually prints basename(argv[0]) when called with --version). Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- tools/testing/selftests/arm64/mte/Makefile | 2 -- 1 file changed, 2 deletions(-)