[LLVMdev] Building LLVM on OS X Yosemite & Passes

[Cristianno Martins]

--
Cristianno Martins
PhD Student of Computer Science
University of Campinas
cmartins at ic.unicamp.br
<cristiannomartins at hotmail.com>

On Wed, Feb 18, 2015 at 7:17 AM, Andrew Selvia <andrew.selvia at icloud.com>
wrote:

> I want to create LLVM passes on OS X Yosemite. First, I built LLVM as such
> (based on http://llvm.org/docs/GettingStarted.html and trial & error):
>
> ...
> $ mkdir build && cd build
> $ CC=clang CXX="clang++ -stdlib=libc++" ../llvm/configure --enable-libcpp
> --enable-shared
> $ make
> $ make install
>
> Then, I tested it with the following command. It worked!
>
> $ opt -load /usr/local/lib/LLVMHello.dylib -hello <test.bc>/dev/null
>
> However, when attempting to build my own pass in OS X Yosemite, I ran into
> confusing linking problems:
>
> $ c++ $(CXXFLAGS) SourceLineAnnotator.cpp -c -o SourceLineAnnotator.o
> $ c++ SourceLineAnnotator.o -shared -o annotate.so
>
> Undefined symbols for architecture x86_64:
>   "llvm::ModulePass::assignPassManager(llvm::PMStack&,
> llvm::PassManagerType)", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::ModulePass::~ModulePass()", referenced from:
>       cs380c::SourceLineAnnotator::~SourceLineAnnotator() in
> SourceLineAnnotator.o
>   "llvm::raw_ostream::write(char const*, unsigned long)", referenced from:
>       llvm::raw_ostream::operator<<(llvm::StringRef) in
> SourceLineAnnotator.o
>   "llvm::raw_ostream::operator<<(unsigned long)", referenced from:
>       llvm::raw_ostream::operator<<(unsigned int) in SourceLineAnnotator.o
>   "llvm::PassRegistry::registerPass(llvm::PassInfo const&, bool)",
> referenced from:
>       llvm::RegisterPass<cs380c::SourceLineAnnotator>::RegisterPass(char
> const*, char const*, bool, bool) in SourceLineAnnotator.o
>   "llvm::PassRegistry::getPassRegistry()", referenced from:
>       llvm::RegisterPass<cs380c::SourceLineAnnotator>::RegisterPass(char
> const*, char const*, bool, bool) in SourceLineAnnotator.o
>   "llvm::AssemblyAnnotationWriter::~AssemblyAnnotationWriter()",
> referenced from:
>
> SourceLineAssemblyAnnotationWriter::~SourceLineAssemblyAnnotationWriter()
> in SourceLineAnnotator.o
>   "llvm::Pass::releaseMemory()", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Pass::dumpPassStructure(unsigned int)", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Pass::getAsImmutablePass()", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Pass::getAsPMDataManager()", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Pass::preparePassManager(llvm::PMStack&)", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Pass::getAdjustedAnalysisPointer(void const*)", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::outs()", referenced from:
>       cs380c::SourceLineAnnotator::runOnModule(llvm::Module&) in
> SourceLineAnnotator.o
>   "llvm::ModulePass::createPrinterPass(llvm::raw_ostream&,
> std::__1::basic_string<char, std::__1::char_traits<char>,
> std::__1::allocator<char> > const&) const", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::ModulePass::getPotentialPassManagerType() const", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Instruction::getMetadataImpl(llvm::StringRef) const", referenced
> from:
>       llvm::Instruction::getMetadata(llvm::StringRef) const in
> SourceLineAnnotator.o
>   "llvm::Pass::getPassName() const", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Pass::verifyAnalysis() const", referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Pass::print(llvm::raw_ostream&, llvm::Module const*) const",
> referenced from:
>       vtable for cs380c::SourceLineAnnotator in SourceLineAnnotator.o
>   "llvm::Module::print(llvm::raw_ostream&,
> llvm::AssemblyAnnotationWriter*) const", referenced from:
>       cs380c::SourceLineAnnotator::runOnModule(llvm::Module&) in
> SourceLineAnnotator.o
>   "vtable for llvm::ModulePass", referenced from:
>       llvm::ModulePass::ModulePass(char&) in SourceLineAnnotator.o
>   NOTE: a missing vtable usually means the first non-inline virtual member
> function has no definition.
>   "vtable for llvm::AssemblyAnnotationWriter", referenced from:
>       llvm::AssemblyAnnotationWriter::AssemblyAnnotationWriter() in
> SourceLineAnnotator.o
>   NOTE: a missing vtable usually means the first non-inline virtual member
> function has no definition.
>   "vtable for llvm::Pass", referenced from:
>       llvm::Pass::Pass(llvm::PassKind, char&) in SourceLineAnnotator.o
>   NOTE: a missing vtable usually means the first non-inline virtual member
> function has no definition.
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> make: *** [annotate.so] Error 1
>
> Eventually, I discovered the .so file could be successfully compiled as
> follows:
>
> $ c++ SourceLineAnnotator.o -shared `/usr/local/bin/llvm-config --ldflags
> --libs --system-libs` -o annotate.so
>
> By adding the flags specified, I can now compile the pass to a .so file.
> However, when I attempt to load it with opt, I get another type of error
> (also related to linking from what I can tell):
>
> $ opt -load annotate.so -annotate <test.bc>/dev/null
>
> opt: CommandLine Error: Option 'print-before-all' registered more than
> once!
> LLVM ERROR: inconsistency in registered CommandLine options
>
> I’m quite stuck. I have fought with linker errors for weeks now and I’m
> not sure what to try. Any help would be greatly appreciated.
>

I've had a similar issue some time ago, and mine was related to the
placement of the CommandLine option on my files. I assume
"print-before-all" is a command line option you're trying to add to LLVM
through your pass, right? It is probable that you declared that command
inside a header file (this kind of error appears when you do that). Try
moving the definition of print-before-all to a cpp file and compiling your
pass again. That should fix it =)


>
> Andrew Selvia
>
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>
>
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