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authorMichael Ellerman <mpe@ellerman.id.au>2017-02-09 19:56:27 +1100
committerShuah Khan <shuahkh@osg.samsung.com>2017-02-14 08:01:55 -0700
commit2047f1d8ba287d208272b6e26360d1a53f7ebf7d (patch)
tree588b596a0ea553bc3bae6cae019e9e4c39aa18e6 /tools
parentd83c3ba0b9263592d1314df924b6c568f7683d29 (diff)
selftests: Fix the .c linking rule
Currently we can't build some tests, for example: $ make -C tools/testing/selftests/ TARGETS=vm ... gcc -Wall -I ../../../../usr/include -lrt -lpthread ../../../../usr/include/linux/kernel.h userfaultfd.c -o tools/testing/selftests/vm/userfaultfd /tmp/ccmOkQSM.o: In function `stress': userfaultfd.c:(.text+0xc60): undefined reference to `pthread_create' userfaultfd.c:(.text+0xca5): undefined reference to `pthread_create' userfaultfd.c:(.text+0xcee): undefined reference to `pthread_create' userfaultfd.c:(.text+0xd30): undefined reference to `pthread_create' userfaultfd.c:(.text+0xd77): undefined reference to `pthread_join' userfaultfd.c:(.text+0xe7d): undefined reference to `pthread_join' userfaultfd.c:(.text+0xe9f): undefined reference to `pthread_cancel' userfaultfd.c:(.text+0xec6): undefined reference to `pthread_join' userfaultfd.c:(.text+0xf14): undefined reference to `pthread_join' /tmp/ccmOkQSM.o: In function `userfaultfd_stress': userfaultfd.c:(.text+0x13e2): undefined reference to `pthread_attr_setstacksize' collect2: error: ld returned 1 exit status This is because the rule for linking .c files to binaries is incorrect. The first bug is that it uses $< (first prerequisite) instead of $^ (all preqrequisites), fix it by using ^$. Secondly the ordering of the prerequisites vs $(LDLIBS) is wrong, meaning on toolchains that use --as-needed we fail to link (as above). Fix that by placing $(LDLIBS) *after* ^$. Finally switch to using the default rule $(LINK.c), so that we get $(CPPFLAGS) etc. included. Fixes: a8ba798bc8ec ("selftests: enable O and KBUILD_OUTPUT") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Tested by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/lib.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 17ed4bbe3963..98841c54763a 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -51,7 +51,7 @@ clean:
$(RM) -r $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES) $(EXTRA_CLEAN)
$(OUTPUT)/%:%.c
- $(CC) $(CFLAGS) $(LDFLAGS) $(LDLIBS) $< -o $@
+ $(LINK.c) $^ $(LDLIBS) -o $@
$(OUTPUT)/%.o:%.S
$(CC) $(ASFLAGS) -c $< -o $@