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Cxx-Options for -std=c++11 #3700

@amigalemming

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@amigalemming

In the llvm-ffi package I have C wrappers around C++ functions of LLVM in the file support.cpp. However, the C++ header files of LLVM-3.5 and later use new C++11 features. Thus I have added

CC-Options: -std=c++11

to llvm-ffi.cabal. Alternatively, I added -std=c++11 to the CFlags field of llvm.pc for use by pkg-config.
Now I get these warnings:

cc1: warning: command line option ‘-std=c++11’ is valid for C++/ObjC++ but not for C [enabled by default]

This is nothing serious, the package works fine. However, the warnings are annoying. Would it help to have a Cxx-Options field for Cabal descriptions? However, I do not know whether the Cabal file is the right place for the -std=c++11 option. Unfortunately, pkg-config does not have CxxFlags, too.

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