[libc++][patch] Sort out common Linux linking issues.

[Dmitri Gribenko]

+ Sylvestre Ledru

On Tue, Apr 1, 2014 at 6:37 PM, Sebastian Redl
<sebastian.redl at getdesigned.at> wrote:
> Following the recent inquiry and David Chisnall's advice, I have created
> a patch that makes libc++ work a lot smoother on Linux. It allows a
> plain "clang++ -stdlib=libc++" command line to work no matter what ABI
> library is used, and fixes the linking errors I encountered.
>
> However, I have absolutely no idea what it does on other platforms.
>
> Log Message:
>
>     Sort out common Linux linking issues.
>
>     Using libc++ on Linux was problematic because using libsupc++ didn't
> pull in
>     all necessary symbols, whereas linking against a dynamic ABI library
> required
>     the user to explicitly link against the ABI library.
>
>     This patch adds a new property, LIBCXX_CXX_ABI_LINK, that can be set
> to dynamic
>     (the default) or static. In dynamic mode, it links against the
> dynamic library,
>     and substitutes its unversioned .so file with a linker script that links
>     against both libc++ and the ABI library. In static mode, it uses
> --whole-archive
>     to force inclusion of the entire ABI library into the libc++.so.
>
>     It also automatically uses libstdc++ for dynamic mode and libsupc++
> for static
>     mode if either was selected; the two ABI names are now synonyms.
>
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>



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main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/