[llvm-commits] [PATCH] Configure: if we compile with clang, check that it is not broken

[Eric Christopher]

At that point I'd want an m4 macro somewhere that encapsulates all of it.

-eric


On Tue, Jan 8, 2013 at 8:40 PM, NAKAMURA Takumi <geek4civic at gmail.com>wrote:

> Could we enhance it to detect also broken gccs?
>
> 2013/1/9 Dmitri Gribenko <gribozavr at gmail.com>:
> > Hello,
> >
> > Some linux distibutions (for example, Mageia 2, Fedora 17) ship Clang
> > that is essentially broken for the end user.  Clang can not find or
> > compile libstdc++ headers.
> >
> > The issue is that our configure prefers clang over gcc, thus selecting
> > a broken Clang when a working GCC is available.
> >
> > The attached patch detects the issue by compiling a simple program.
> > If it does not compile -- configure stops with an error suggesting the
> > user to select a different compiler.
> >
> > Unfortunately, my autoconf skills are not good enough to implement a
> > better strategy -- to find the first *working* compiler.  But the
> > current patch to reject a broken compiler is a strict improvement.
> >
> > Edward Diener tested this on affected platforms. [1]
> >
> > Please review.  My biggest concern is about including cxxabi.h
> unconditionally.
> >
> > Dmitri
> >
> > [1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-January/057716.html
> >
> > --
> > 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>*/
> >
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> >
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