scons clang ASan undefined reference...

[leandro moreno]

Hello guys. I have a problem when I try to compile a project using scons  (a builder like Cmake).

I try to use clang-3.4 instead of gcc. The project compiles all right, but when is in the link step, the program terminate with error. This is the log:

install/libs/libbiopp.so: undefined reference to `__asan_report_store4'

install/libs/libbiopp.so: undefined reference to `__asan_register_globals'

install/libs/libbiopp.so: undefined reference to `__asan_report_load_n'

install/libs/libbiopp.so: undefined reference to `__asan_report_load4'

install/libs/libbiopp.so: undefined reference to `__asan_report_store8'

install/libs/libbiopp.so: undefined reference to `__asan_unregister_globals'

install/libs/libbiopp.so: undefined reference to `__asan_handle_no_return'

install/libs/libbiopp.so: undefined reference to `__asan_init_v3'

install/libs/libbiopp.so: undefined reference to `__asan_report_load1'

install/libs/libbiopp.so: undefined reference to `__asan_report_store1'

install/libs/libbiopp.so: undefined reference to `__asan_after_dynamic_init'

install/libs/libbiopp.so: undefined reference to `__asan_report_load8'

install/libs/libbiopp.so: undefined reference to `__asan_report_store_n'

install/libs/libbiopp.so: undefined reference to `__asan_before_dynamic_init'

clang: error: linker command failed with exit code 1 (use -v to see invocation)

scons: *** [build/biopp/tests/biopp_test] Error 1

scons: building terminated because of errors.

I tried a lot of things, add flags, remove flags, everything with flags and nothing work. I read that I can fix this adding -libclang_rt.asan-x86_64.a to the linker, but clang can not find the lib. Do you have any suggest? 

I have ubuntu 12.04, clang-3.4.

I hope your answer soon. Thank you.

[Dmitry Vyukov]

Hi,

You need to pass -fsanitize=address flag to the compiler during linking.

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[leandro moreno]

Hi Dmitry! I tried that too, and doesn't work =(.

[Dmitry Vyukov]

Can you build a single file this way? I.e. 

$ clang 1.cpp -fsanitize=address -c

$ clang 1.o -fsanitize=address

If not, what error it produces?

If yes, dump compiler invocations during your build and see what is wrong.

[Timur Iskhodzhanov]

How did you get that version of clang? Did you build it from source?
If so - have you checked out compiler-rt before compiling?

09 авг. 2013 г. 0:42 пользователь "leandro moreno" <moreno.l...@gmail.com> написал:

--

[leandro moreno]

I get it with the LLVM repository http://llvm.org/apt/. I can build a single file with asan, the problem is when I have to link more than one .o.

[Alexey Samsonov]

Here's an extract from http://clang.llvm.org/docs/AddressSanitizer.html:

"When linking shared libraries, the AddressSanitizer run-time is not linked, so -Wl,-z,defs may cause link errors (don’t use it with AddressSanitizer)."

--

Alexey Samsonov, MSK

[leandro moreno]

ld command is called with this params. So I can see that all libraries are good load.

"/usr/bin/ld" -whole-archive /usr/bin/../lib/clang/3.4/lib/linux/libclang_rt.asan-x86_64.a -no-whole-archive -z relro --hash-style=gnu --build-id --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.6/crtbegin.o -L/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../.. -L/lib -L/usr/lib hello.o -lpthread -lrt -ldl -export-dynamic -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-linux-gnu/4.6/crtend.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crtn.o

What is wrong here?

[leandro moreno]

Yes, I saw that too! But, I don't know how can I take off the -z flag from scons =(. Scons manage that. Sorry for publish a lot of messages.

I added -v flag in my project, and ld has the next params:

 "/usr/bin/ld" -z relro --hash-style=gnu --build-id --eh-frame-hdr -m elf_x86_64 -shared -o build/biopp/libbiopp.so /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.6/crtbeginS.o -Linstall/libs -L/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../.. -L/lib -L/usr/lib -rpath=/home/moreno/fudepan-build/install/libs build/biopp/src/bio_molecular/bio_molecular.os build/biopp/src/bio_molecular/triplets.os build/biopp/src/rna_structure/rna_structure.os -lstdc++ -lm -lgcc_s -lc -lgcc_s /usr/lib/gcc/x86_64-linux-gnu/4.6/crtendS.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crtn.o

I can not see the asan libraries loaded =(

[Alexey Samsonov]

On Fri, Aug 9, 2013 at 4:55 PM, leandro moreno <moreno.l...@gmail.com> wrote:

Yes, I saw that too! But, I don't know how can I take off the -z flag from scons =(. Scons manage that. Sorry for publish a lot of messages.

I added -v flag in my project, and ld has the next params:

 "/usr/bin/ld" -z relro --hash-style=gnu --build-id --eh-frame-hdr -m elf_x86_64 -shared -o build/biopp/libbiopp.so /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.6/crtbeginS.o -Linstall/libs -L/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../.. -L/lib -L/usr/lib -rpath=/home/moreno/fudepan-build/install/libs build/biopp/src/bio_molecular/bio_molecular.os build/biopp/src/bio_molecular/triplets.os build/biopp/src/rna_structure/rna_structure.os -lstdc++ -lm -lgcc_s -lc -lgcc_s /usr/lib/gcc/x86_64-linux-gnu/4.6/crtendS.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crtn.o

I can not see the asan libraries loaded =(

This is fine, ASan library should not be linked into the shared object files. What you should do is to somehow allow your build system to build .so files with unresolved symbols.

--

Alexey Samsonov, MSK

[leandro moreno]

But if I do an example and I build it by myself, ld take this params, and the libclang_rt.asan is there!

 "/usr/bin/ld" -whole-archive /usr/bin/../lib/clang/3.4/lib/linux/libclang_rt.asan-x86_64.a -no-whole-archive -z relro --hash-style=gnu --build-id --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.6/crtbegin.o -L/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.6/../../.. -L/lib -L/usr/lib hello.o -lpthread -lrt -ldl -export-dynamic -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-linux-gnu/4.6/crtend.o /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crtn.o

[leandro moreno]

Oh God! Finally I did it! I was setting the -fsanitize=address in the wrong place. Now this compile!!! Thank you very much to you guys. Thank you for the fast answers =).

[Alexey Samsonov]

Right, ASan runtime is:

* linked into executables (a.out in your example)

* not linked into shared objects (*.so)