[PATCH][libcxx] Support command line configuration of ABI libraries for testing

[Daniel Dunbar]

Hi Michael,

Two comments on the patch:

1. Please wrap lines to 80 columns.

2. As written, the usage isn't quite "extra" link libraries, rather it
completely replaces the link libraries. I would propose making that part of
the name and just calling it ldflags or link_flags, and have it completely
override the link line (which would still get extended if use_system_lib is
available).

 - Daniel



On Thu, Feb 7, 2013 at 1:10 AM, Michael van der Westhuizen <
r1mikey at gmail.com> wrote:

> Hi Daniel,
>
> The attached patch adds support for specifying the ABI libraries to link
> against for testing purposes.  This, with the CMake ABI library support
> patch I sent previously, allows me to build and test against all three
> supported ABI libraries without source tree modifications.
>
> The patch adds a lit parameter called extra_link_libs, which specifies the
> "-l" arguments to use when linking tests.  If not present, the lit.cfg
> maintains the existing behaviour (on Linux this is suitable for libsupc++
> only).
>
> To use this, from my libc++ build directory I run the following to build
> and test against all supported ABI libraries:
>
> $ rm -rf * && cmake -DLIBCXX_CXX_ABI=libsupc++
> '-DLIBCXX_LIBSUPCXX_INCLUDE_PATHS=/usr/include/c++/4.7;/usr/include/x86_64-linux-gnu/c++/4.7'
> -DLIT_EXECUTABLE=/home/michael/llvm/utils/lit/lit.py ../libcxx && make -j 4
> && make check-libcxx
> $ rm -rf * && cmake -DLIBCXX_CXX_ABI=libcxxabi
> '-DLIBCXX_LIBCXXABI_INCLUDE_PATHS=/home/michael/libcxxabi/include'
> -DLIT_EXECUTABLE=/home/michael/llvm/utils/lit/lit.py '-DLLVM_LIT_ARGS=-sv
> --param extra_link_libs="-lc++abi -lunwind -lc -lm -lpthread -lrt -lgcc_s"'
> ../libcxx && make -j 4 && make check-libcxx
> $ rm -rf * && cmake -DLIBCXX_CXX_ABI=libcxxrt
> '-DLIBCXX_LIBCXXRT_INCLUDE_PATHS=/home/michael/libcxxrt/src'
> -DLIT_EXECUTABLE=/home/michael/llvm/utils/lit/lit.py '-DLLVM_LIT_ARGS=-sv
> --param extra_link_libs="-lcxxrt -lc -lm -lpthread -lrt -lgcc_s"' ../libcxx
> && make -j 4 && make check-libcxx
>
> This should be usable for testing against compiler-rt as well.
>
> I'll flesh out some build instructions for all the ABI variants on Linux
> and submit those as a separate patch.
>
> I suppose the next big challenge would be having the driver support ABI
> library configuration, but that's a bit beyond me at the moment!
>
> I'll send a separate mail to cfe-dev with current Linux test results for
> the various ABI libraries.
>
> Michael
>
>
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