[llvm-dev] Undefined symbols in llvm-objdump linkage on x86_64-apple-darwin15

Tue May 24 11:28:35 PDT 2016

Jack,

What version of CMake are you using?

-Chris

> On May 24, 2016, at 11:00 AM, Jack Howarth <howarth.mailing.lists at gmail.com> wrote:
> 
> On Tue, May 24, 2016 at 1:35 PM, Kevin Enderby <enderby at apple.com> wrote:
>> Hi Jack,
>> 
>> Just a guess here, this may be the bug Chris helped me out with in the use of the include file xar/xar.h which is not C++ safe.  I needed to wrap my include via:
>> 
>> #ifdef HAVE_LIBXAR
>> extern "C" {
>> #include <xar/xar.h>
>> }
>> #endif
>> 
>> I think we may need some help from Chris to track this down.  I’ll bug him in a bit to see if he can help us on this.
> 
> While the build here with  -DLLVM_LINK_LLVM_DYLIB:BOOL=ON passed on
> the cmake options produces HAVE_LIBXAR:INTERNAL=1 in CMakeCache.txt, I
> don't see anything in the cmakefiles for tools/llvm-objdump to provide
> the necessary linkage on the system libxar shared library. Appending
> the missing linkage for -lxar onto
> build/stage1tools/llvm-objdump/CMakeFiles/llvm-objdump.dir/link.txt...
> 
> /sw/src/fink.build/llvm39-3.9.0-1/opt-bin/ccclang++   -fno-common
> -fPIC -fvisibility-inlines-hidden -Wall -W -Wno-unused-parameter
> -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic
> -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor
> -Wdelete-non-virtual-dtor -Werror=date-time -std=c++11 -O3
> -Wl,-search_paths_first -Wl,-headerpad_max_install_names  -L/sw/lib
> -Wl,-dead_strip CMakeFiles/llvm-objdump.dir/llvm-objdump.cpp.o
> CMakeFiles/llvm-objdump.dir/COFFDump.cpp.o
> CMakeFiles/llvm-objdump.dir/ELFDump.cpp.o
> CMakeFiles/llvm-objdump.dir/MachODump.cpp.o  -o ../../bin/llvm-objdump
> ../../lib/libLLVM.dylib -Wl,-rpath, at executable_path/../lib -lxar
> 
> eliminates the bootstrap failure.
> 
>> 
>> Kev
>> 
>>> On May 24, 2016, at 10:28 AM, Jack Howarth <howarth.mailing.lists at gmail.com> wrote:
>>> 
>>> On Tue, May 24, 2016 at 1:24 PM, Jack Howarth
>>> <howarth.mailing.lists at gmail.com> wrote:
>>>> On Tue, May 24, 2016 at 1:22 PM, Jack Howarth
>>>> <howarth.mailing.lists at gmail.com> wrote:
>>>>> On Tue, May 24, 2016 at 12:08 PM, Reid Kleckner <rnk at google.com> wrote:
>>>>>> Kevin Enderby added those symbol uses in r270491. It has a cmake
>>>>>> feature test, and all the uses of those symbols appear bracketed in
>>>>>> HAVE_LIBXAR, so I don't know what went wrong for you.
>>>>> 
>>>>> The trigger for this build failure is the usage of
>>>>> -DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL=ON. If I drop that cmake
>>>>> option, the linkage failure for llvm-objdump disappears.
>>>> 
>>>> Wrong cmake option. I meant to say that -DLLVM_LINK_LLVM_DYLIB:BOOL=ON
>>>> is the trigger of the build failure. Sorry for the noise there.
>>> 
>>> Filed as https://llvm.org/bugs/show_bug.cgi?id=27855
>>> 
>>>> 
>>>>> 
>>>>>> 
>>>>>> On Tue, May 24, 2016 at 8:07 AM, Jack Howarth via llvm-dev
>>>>>> <llvm-dev at lists.llvm.org> wrote:
>>>>>>> Is anyone else seeing a bootstrap failure on x86_64-apple-darwin15 in
>>>>>>> current trunk?
>>>>>>> 
>>>>>>> [ 95%] Linking CXX executable ../../bin/llvm-objdump
>>>>>>> Undefined symbols for architecture x86_64:
>>>>>>> "_xar_serialize", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_file_first", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_iter_new", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_prop_first", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_extract_tobuffersz", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_open", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_prop_get", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_close", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_prop_next", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_iter_free", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> "_xar_file_next", referenced from:
>>>>>>>     DumpBitcodeSection(llvm::object::MachOObjectFile*, char const*,
>>>>>>> unsigned int, bool, bool, bool, std::__1::basic_string<char,
>>>>>>> std::__1::char_traits<char>, std::__1::allocator<char> >) in
>>>>>>> MachODump.cpp.o
>>>>>>> ld: symbol(s) not found for architecture x86_64
>>>>>>> clang: error: linker command failed with exit code 1 (use -v to see invocation)
>>>>>>> tools/llvm-objdump/CMakeFiles/llvm-objdump.dir/build.make:173: recipe
>>>>>>> for target 'bin/llvm-objdump' failed
>>>>>>> make[2]: *** [bin/llvm-objdump] Error 1
>>>>>>> make[2]: Target 'tools/llvm-objdump/CMakeFiles/llvm-objdump.dir/build'
>>>>>>> not remade because of errors.
>>>>>>> CMakeFiles/Makefile2:21861: recipe for target
>>>>>>> 'tools/llvm-objdump/CMakeFiles/llvm-objdump.dir/all' failed
>>>>>>> make[1]: *** [tools/llvm-objdump/CMakeFiles/llvm-objdump.dir/all] Error 2
>>>>>>> _______________________________________________
>>>>>>> LLVM Developers mailing list
>>>>>>> llvm-dev at lists.llvm.org
>>>>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> 