[mpich-discuss] Building with Clang

[Jed Brown]

I tried compiling version 1.4 and current svn using clang-2.9 and get errors
like

mpich2-1.4$ ./configure --prefix=/home/jed/petsc/mpich-clang CC=clang
CFLAGS= -fPIC -Wall -Wwrite-strings -Wno-strict-aliasing
-Wno-unknown-pragmas -g3  --disable-cxx --disable-f77 --disable-fc
--enable-shared --enable-sharedlibs=libtool --with-device=ch3:sock
--without-mpe --with-pm=hydra --enable-g=meminit --enable-fast
[...]
configure:6876: error: Creating shared libraries using libtool not yet
supported

mpich2-svn$ ./configure --prefix=/home/jed/usr/mpich-clang --enable-shared
--enable-sharedlibs=gcc --enable-error-checking=runtime
--enable-error-messages=all --enable-timer-type=clock_gettime
--with-python=python2 --with-pm=hydra CC=clang CXX=clang++ F77=gfortran
FC=gfortran
configure:6846: error: Cannot build shared libraries with this compiler

It's not clear to me what test is actually failing here since there doesn't
seem to be any relevant output in config.log. This version of clang
certainly can create shared libraries.

Any ideas what is special here?
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