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nixpkgs/pkgs/misc/vim-plugins/vim2nix/additional-nix-code/clang_complete
Jörg Thalheim e2197465c1
cc-wrapper: externalize default_cxx_stdlib_compile
This value is require to get c++ std include path for libclang based tools (vim plugins in my case).
I currently extract it this with this rather command:

```
eval echo $(nix-instantiate --eval --expr 'with (import <nixpkgs>) {}; clang.default_cxx_stdlib_compile')
```

it did not trigger any recompilation on my system.
2017-06-08 19:50:40 +01:00

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# In addition to the arguments you pass to your compiler, you also need to
# specify the path of the C++ std header (if you are using C++).
# These usually implicitly set by cc-wrapper around clang (pkgs/build-support/cc-wrapper).
# The linked ruby code shows generates the required '.clang_complete' for cmake based projects
# https://gist.github.com/Mic92/135e83803ed29162817fce4098dec144
# as an alternative you can execute the following command:
# $ eval echo $(nix-instantiate --eval --expr 'with (import <nixpkgs>) {}; clang.default_cxx_stdlib_compile')
preFixup = ''
substituteInPlace "$out"/share/vim-plugins/clang_complete/plugin/clang_complete.vim \
--replace "let g:clang_library_path = '' + "''" + ''" "let g:clang_library_path='${llvmPackages.clang.cc}/lib/libclang.so'"
'';