Re: [boost] [Boost-commit] svn:boost r66442 - in trunk/boost: math/tools test test/impl

Subject: Re: [boost] [Boost-commit] svn:boost r66442 - in trunk/boost: math/tools test test/impl
From: Jürgen Hunold (juergen.hunold_at_[hidden])
Date: 2010-11-07 15:26:53

Hi !

On Sunday, 7. November 2010 21:05:06 admin_at_[hidden] wrote:
> Author: wash
> Date: 2010-11-07 15:05:04 EST (Sun, 07 Nov 2010)
> New Revision: 66442
> URL: http://svn.boost.org/trac/boost/changeset/66442
> 
> Log:
> Clang hand-holding, mostly for issues caused by Clang defining GCC macros.

I do not think that removing the inclusion of "fenv.h" for clang is the right 
solution. According to 
http://llvm.org/bugs/show_bug.cgi?id=6907
it is a known compiler bug that clang fails to correctly load "fenv.h" in 
certain environments (several gcc versions installed...)
I've been working around this by simply adding (see below)

> Text files modified:
>    trunk/boost/math/tools/config.hpp           |     2 +-
>    trunk/boost/test/execution_monitor.hpp      |    15 ++++++++-------
>    trunk/boost/test/impl/execution_monitor.ipp |    18 +++++++++---------
>    3 files changed, 18 insertions(+), 17 deletions(-)
> 
> Modified: trunk/boost/math/tools/config.hpp
> ===========================================================================
> === --- trunk/boost/math/tools/config.hpp   (original)
> +++ trunk/boost/math/tools/config.hpp   2010-11-07 15:05:04 EST (Sun, 07
> Nov 2010) @@ -255,7 +255,7 @@
>  } // namespace tools
>  }} // namespace boost namespace math
> 
> -#if (defined(__linux__) && !defined(__UCLIBC__)) || defined(__QNX__) ||
> defined(__IBMCPP__) +#if (defined(__linux__) && !defined(__UCLIBC__) &&
> !defined(__clang__)) || defined(__QNX__) || defined(__IBMCPP__)
> 
>     #include <fenv.h>

#if defined(__clang__)
#include </usr/include/fenvh.>
#else

for  my local working copies.

>         return ~old_cw & BOOST_FPE_ALL;
> -#elif defined(__GLIBC__) && defined(__USE_GNU)
> +#elif defined(__GLIBC__) && defined(__USE_GNU) && !defined(BOOST_CLANG)
> 
>      ::feclearexcept(BOOST_FPE_ALL);

And this actually removes fp-Support from Boost.Test.

Not good.

Please find a better solution.
And/Or mark the relevant places with Todo containing a reference to the clang 
bug report.

Yours,

Jürgen
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