Re: [Boost-build] problems when building boost with clang

Subject: Re: [Boost-build] problems when building boost with clang
From: Vladimir Prus (ghost_at_[hidden])
Date: 2010-12-09 06:03:52

On Thursday, December 09, 2010 13:57:34 John Maddock wrote:
> > I tried to build BOOST with clang 2.8 compiler today, but I encountered
> > some
> > failures. This is the first time ever I tried to build BOOST, so most
> > likely
> > I'm doing something wrong. I would appreciate any help to resolve this
> > issue.
> > 
> > I saw an announcement dated March 20, 2010 that clang++ successfully
> > builds
> > BOOST on
> > http://blog.llvm.org/2010/05/clang-builds-boost.html, so I followed
> > instructions on how to do it and I expected to see similar results. The
> > difference is that I used 2.8 version of the clang compiler and that I
> > compiled on Linux, not on Mac OS.
> > 
> > 
> > (1) First, for comparison reason, I've built BOOST with gcc 4.4.3
> > compiler,
> > installed on my system.
> > I saw some failures/skipped targets...
> > 
> > ...failed updating 58 targets...
> > ...skipped 12 targets...
> > ...updated 763 targets...
> > 
> > Is it expected results for gcc?
> > 
> > The reason why some tests failed is because some headers are missing:
> > 
> > e.g.
> > gcc.compile.c++
> > /home/kromanova/Boost_1_44_0/build-gcc/boost/bin.v2/libs/regex/build/gcc-
> > 4.4.3/debug/has_icu_test.o libs/regex/build/has_icu_test.cpp:12:30:
> > error: unicode/uversion.h: No such
> > file or directory
> > libs/regex/build/has_icu_test.cpp:13:28: error: unicode/utypes.h: No such
> > file or directory
> > libs/regex/build/has_icu_test.cpp:14:27: error: unicode/uchar.h: No such
> > file or directory
> > libs/regex/build/has_icu_test.cpp:15:26: error: unicode/coll.h: No such
> > file
> > or directory
> > 
> > Am I missing something???
> 
> That should *not* cause any tests to fail, and you should *not* see those
> messages: they should be directed to file as part of the regex lib's
> configuration process.
> 
> > (2) I was not sure whether gcc compilation results are expected or not,
> > but
> > I hoped at least to get similar failed/skipped rate for the clang 2.8
> > compiler. However the results were much worse:
> > 
> > ...failed updating 63 targets...
> > ...skipped 309 targets...
> > ...updated 461 targets...
> > 
> > When I analyzed the log file, at some point things went differently
> > (compared to building BOOST with gcc), namely, pch.hpp.pchi file was not
> > found. Do you know why this file is not where it's expected to be? Many
> > tests are skipped/failed later because this file is missing.
> > Do you know how could I resolve this issue?
> 
> Looks like pch-support for the clang compiler is broken inside Boost.Build.
> Vladimir?

I'd suggest passing pch=off to Boost.Build. I never looked at clang support, so
cannot immediately comment what might be wrong.

- Volodya

-- 
Vladimir Prus
http://vladimir_prus.blogspot.com
Boost.Build: http://boost.org/boost-build2