| Message ID | 20190924201451.31977-1-skhan@linuxfoundation.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | selftests: kvm: Fix libkvm build error | expand |
On 24/09/19 22:14, Shuah Khan wrote: > Fix the following build error: > > libkvm.a(assert.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a PIE object; recompile with -fPIC > > Add -fPIC to CFLAGS to fix it. This is wrong, these testcases cannot be position-independent executables. Can you include the failing command line from "V=1" output? The problem seems to be that these definitions are not working properly: no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \ $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie) LDFLAGS += -pthread $(no-pie-option) Thanks, Paolo > Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> > --- > tools/testing/selftests/kvm/Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile > index 62c591f87dab..b4a55d300e75 100644 > --- a/tools/testing/selftests/kvm/Makefile > +++ b/tools/testing/selftests/kvm/Makefile > @@ -44,7 +44,7 @@ INSTALL_HDR_PATH = $(top_srcdir)/usr > LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/ > LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include > CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \ > - -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \ > + -fno-stack-protector -fPIC -fno-PIE -I$(LINUX_TOOL_INCLUDE) \ > -I$(LINUX_HDR_PATH) -Iinclude -I$(<D) -Iinclude/$(UNAME_M) -I.. > > no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \ >
On 9/25/19 1:48 AM, Paolo Bonzini wrote: > On 24/09/19 22:14, Shuah Khan wrote: >> Fix the following build error: >> >> libkvm.a(assert.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a PIE object; recompile with -fPIC >> >> Add -fPIC to CFLAGS to fix it. > > This is wrong, these testcases cannot be position-independent > executables. Can you include the failing command line from "V=1" > output? > You are right. This isn't correct. > The problem seems to be that these definitions are not working properly: > > no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \ > $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie) > > LDFLAGS += -pthread $(no-pie-option) > Yup. That is what is happening, when I build using "make TARGETS=kvm kselftest" You can see this below: gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread x86_64/cr4_cpuid_sync_test.c vs. Running make in kvm directory: gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fPIC -fno-PIE -I../../../../tools/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/cr4_cpuid_sync_test.c I was playing with both options yesterday and totally confused myself thinking that adding fPIC helps. It doesn't. I am looking into this to see how we can make "make kselftest" work. Once I figure it out, will send v2. I think for some reason in the failing case, no-pie-option and pgste-option are null strings. thanks, -- Shuah
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 62c591f87dab..b4a55d300e75 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -44,7 +44,7 @@ INSTALL_HDR_PATH = $(top_srcdir)/usr LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/ LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \ - -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \ + -fno-stack-protector -fPIC -fno-PIE -I$(LINUX_TOOL_INCLUDE) \ -I$(LINUX_HDR_PATH) -Iinclude -I$(<D) -Iinclude/$(UNAME_M) -I.. no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \
Fix the following build error: libkvm.a(assert.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a PIE object; recompile with -fPIC Add -fPIC to CFLAGS to fix it. Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> --- tools/testing/selftests/kvm/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)