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osrm-backend/third_party/mason/scripts/llvm/base/README.md

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llvm

This is a package of llvm. Multiple packages are based on repackaging the binaries from this one.

Depends

On Linux

  • = Ubuntu precise

  • binutils 2.27 from mason for -flto support

On OS X

  • OS X >= 10.11
  • On XCode >= 8 installed to /Applications/Xcode.app such that xcode-select -p returns /Applications/Xcode.app/Contents/Developer

If you don't have Xcode installed in /Applications you can still use the clang++ in this package but you need to set:

  1. -isysroot to point at your Mac SDK (the value returned from xcrun --show-sdk-path)

  2. Add an include flag to point at your C++ headers which are generally at ls $(dirname $(xcrun --find clang++))/../include/c++/v1. For the command line tools this directory is at /Library/Developer/CommandLineTools/usr/include/c++/v1/

Details of builds

  • OS X build done on OS X 10.12.1
  • Linux build done on Ubuntu precise

Builds (and rebuilds) are done using utils/rebuild-llvm-tools.sh

OS X details

On MacOS we use the apple system clang++ to compile and link against the apple system libc++.

Linux details

On Linux we use Ubuntu Precise in order to ensure that binaries can be run on Ubuntu Precise and newer platforms.

We link clang++ and other llvm c++ tools to libc++ (the one within the build) to avoid clang++ itself depending on a specific libstdc++ version.

The clang++ binary still defaults to building and linking linux programs against libstdc++.