[LLVMdev] Using LLVM on OS X 10.9.5

[Geoff Shannon]

Hi there,

I'm trying to get set up to build things using the LLVM libraries and I'm
running into issues with my toolchain.

Specifically, they seem to revolve around getting the correct versions of
tools, the linker not being able to find certain .a files.

So my quick specific question is, will it be problematic if I install llvm
under say /usr?  Any known pitfalls?

More context follows:
Currently, I have a downloaded copy of LLVM 3.5 along with Clang,
compiler-rt, libcxx, libcxxabi all extracted to the appropriate places in
the source tree, and I'm building it using Cmake.  This builds correctly,
but I'm not sure how to setup my project to use both the tools and the
libraries that are built from this source tree.

I've read through the page on creating an LLVM project, and combined with
that information and the information on building LLVM with Cmake, I decided
to put my new project in the projects subdirectory of llvm source.  My
CMakeLists.txt file is attached.  Using this strategy my code is included
in the LLVM build, but when I try to include LLVM support for doing command
line processing I get the output in out.txt.  The output of running `env`
is in env.txt.

If anybody has any suggestions on reading I should do to prepare my
toolchain better I would be very appreciative.  Also, comments and
suggestions about how to setup this new project would be greatly
appreciated.

-- 
Geoff

Nothing is ever easy.
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# CMake build for postfix language

project(postfix)

add_executable(postfix postfix.cpp)

# Find the libraries that correspond to the LLVM components
# that we wish to use
llvm_map_components_to_libnames(llvm_libs support core)

# Link against LLVM libraries
target_link_libraries(postfix ${llvm_libs})
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[1/1] Linking CXX executable bin/postfix
FAILED: : && /usr/bin/c++   -fPIC -fvisibility-inlines-hidden -Wall -W -Wno-unused-parameter -Wwrite-strings -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor -std=c++11 -fcolor-diagnostics -Wl,-search_paths_first -Wl,-headerpad_max_install_names  projects/postfix/CMakeFiles/postfix.dir/postfix.cpp.o  -o bin/postfix  lib/libLLVMSupport.a lib/libLLVMCore.a lib/libLLVMSupport.a -lcurses -lpthread -lz -Wl,-rpath, at executable_path/../lib && :
Undefined symbols for architecture x86_64:
  "typeinfo for llvm::cl::GenericOptionValue", referenced from:
      typeinfo for llvm::cl::OptionValueCopy<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > in postfix.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)
ninja: build stopped: subcommand failed.
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