Current LLVM trunk incompatible with librustrt.

[froystig]

On 32-bit Linux and LLVM trunk revision 133904 (tip at the time of filing), rustc fails to build (in particular, librustrt fails to link) rustllvm/MachOObjectFile.o. This appears to be due to a change in the interface of LLVM's ObjectFile probably introduced by revisions 133868 through 133872.

LLVM revision 133867 works just fine.

Some sample errors include:

/usr/local/include/llvm/Object/ObjectFile.h:131:22: error: ‘virtual llvm::error_code llvm::object::ObjectFile::getSymbolNext(llvm::object::DataRefImpl, llvm::object::SymbolRef&) const’ was hidden
../src/rustllvm/MachOObjectFile.cpp:49:21: error:   by ‘virtual llvm::object::SymbolRef llvm::MachOObjectFile::getSymbolNext(llvm::object::DataRefImpl) const’

../src/rustllvm/MachOObjectFile.cpp: In constructor ‘llvm::MachOObjectFile::MachOObjectFile(llvm::MemoryBuffer*, llvm::object::MachOObject*)’:
../src/rustllvm/MachOObjectFile.cpp:37:65: error: no matching function for call to ‘llvm::object::ObjectFile::ObjectFile(llvm::MemoryBuffer*&)’
/usr/local/include/llvm/Object/ObjectFile.h:116:3: note: candidates are: llvm::object::ObjectFile::ObjectFile(unsigned int, llvm::MemoryBuffer*, llvm::error_code&)
/usr/local/include/llvm/Object/ObjectFile.h:113:3: note:                 llvm::object::ObjectFile::ObjectFile(const llvm::object::ObjectFile&)
/usr/local/include/llvm/Object/ObjectFile.h:112:3: note:                 llvm::object::ObjectFile::ObjectFile()

and

../src/rustllvm/MachOObjectFile.cpp: In static member function ‘static llvm::object::ObjectFile* llvm::object::ObjectFile::createMachOObjectFile(llvm::MemoryBuffer*)’:
../src/rustllvm/MachOObjectFile.cpp:79:46: error: cannot allocate an object of abstract type ‘llvm::MachOObjectFile’
../src/rustllvm/MachOObjectFile.cpp:32:43: note:   because the following virtual functions are pure within ‘llvm::MachOObjectFile’:
/usr/local/include/llvm/Object/ObjectFile.h:131:22: note:   virtual llvm::error_code llvm::object::ObjectFile::getSymbolNext(llvm::object::DataRefImpl, llvm::object::SymbolRef&) const

[espindola]

fixed