Re: [PATCH 5/7] selftests/x86: fix cross build logic

From: Andy Lutomirski
Date: Tue Apr 14 2015 - 20:33:23 EST


On 04/14/2015 03:52 PM, Tyler Baker wrote:
x86 tests should not be built when ARCH != x86. Reused the logic from
breakpoints to determine when it's appropriate to build.

In the future, please cc the author of recently-written code that you're fixing :)

This patch is really weird. You're generating ARCH, then you're modifying it part way through, and you're changing the rule for all_32 and all_64 to print an error (and succeed!) if run on the wrong arch.

I don't see the point of the latter at all. Just let all have no dependencies if you're on the wrong ARCH.

As for the former, can you do this more cleanly? This is really ugly. It looks to me (on naive reading) like 64-bit hosts won't do the right thing. (The right thing is to build both bitnesses of tests.)

--Andy


Signed-off-by: Tyler Baker <tyler.baker@xxxxxxxxxx>
---
tools/testing/selftests/x86/Makefile | 35 +++++++++++++++++++++++------------
1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
index f0a7918..7be67a0 100644
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -7,31 +7,36 @@ BINARIES_64 := $(TARGETS_C_BOTHBITS:%=%_64)

CFLAGS := -O2 -g -std=gnu99 -pthread -Wall

-UNAME_P := $(shell uname -p)
-
-# Always build 32-bit tests
+# Taken from perf makefile
+uname_M := $(shell uname -m 2>/dev/null || echo not)
+ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/i386/)
+ifeq ($(ARCH),i386)
+ARCH := x86
all: all_32
-
+endif
+ifeq ($(ARCH),x86_64)
+ARCH := x86
# If we're on a 64-bit host, build 64-bit tests as well
-ifeq ($(shell uname -p),x86_64)
-all: all_64
+all: all_32 all_64
endif

all_32: check_build32 $(BINARIES_32)

all_64: $(BINARIES_64)

-clean:
- $(RM) $(BINARIES_32) $(BINARIES_64)
-
-run_tests:
- ./run_x86_tests.sh
-
$(TARGETS_C_BOTHBITS:%=%_32): %_32: %.c
+ifeq ($(ARCH),x86)
$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
+else
+ echo "Not an x86 target, can't build x86 tests"
+endif

$(TARGETS_C_BOTHBITS:%=%_64): %_64: %.c
+ifeq ($(ARCH),x86)
$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
+else
+ echo "Not an x86 target, can't build x86 tests"
+endif

check_build32:
@if ! $(CC) -m32 -o /dev/null trivial_32bit_program.c; then \
@@ -46,3 +51,9 @@ check_build32:
echo " yum install glibc-devel.*i686"; \
exit 1; \
fi
+
+run_tests:
+ ./run_x86_tests.sh
+
+clean:
+ $(RM) $(BINARIES_32) $(BINARIES_64)


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