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

[Kevin Enderby via llvm-dev]

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.

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
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