Eric, adding those flags worked. Thanks!
Rob, yes, bug report from libressl matched with what I was getting. 

Can you please explain what was wrong? I installed the GNU compilers using Homebrew. I realize I should have used “brew link gcc5” or something, but instead, I went to /usr/local/bin and manually created the symlinks (gcc, gfortran, g++, etc) pointing to gcc-5, gfortran-5, etc. Did I miss something?

I did not face this issue when I did the same thing (Homebrew gcc + compile MPICH + manual symlinks) on a Macbook. The only difference I see there is that the build is apple-darwin14.4.0.


On Oct 30, 2015, at 8:57 AM, Eric A. Borisch <eborisch@gmail.com> wrote:

You will need to add '-Wa,-q' for CFLAGS and CXXFLAGS for gcc* on
Yosemite and above. This will use the clang assembler. (See man as)

<plug>The MacPorts mpich package does this automatically when needed.</plug>

- Eric

On Fri, Oct 30, 2015 at 10:13 AM, Rob Latham <robl@mcs.anl.gov> wrote:


On 10/28/2015 12:46 PM, Ghosh, Debojyoti wrote:

Hi,

I am getting a compilation error while trying to compile MPICH on my Mac
desktop. I installed the latest GNU compilers using Homebrew.

gcc -v
Using built-in specs.
COLLECT_GCC=gcc

COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/5.2.0/libexec/gcc/x86_64-apple-darwin14.5.0/5.2.0/lto-wrapper
Target: x86_64-apple-darwin14.5.0
Configured with: ../configure --build=x86_64-apple-darwin14.5.0
--prefix=/usr/local/Cellar/gcc/5.2.0
--libdir=/usr/local/Cellar/gcc/5.2.0/lib/gcc/5
--enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-5
--with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr
--with-mpc=/usr/local/opt/libmpc --with-isl=/usr/local/opt/isl
--with-system-zlib --enable-libstdcxx-time=yes --enable-stage1-checking
--enable-checking=release --enable-lto
--with-build-config=bootstrap-debug --disable-werror
--with-pkgversion='Homebrew gcc 5.2.0'
--with-bugurl=https://github.com/Homebrew/homebrew/issues
--enable-plugin --disable-nls --enable-multilib
Thread model: posix
gcc version 5.2.0 (Homebrew gcc 5.2.0)


We test with gcc-5.2 on our mac build bots, so it's definitely possible.

I am getting the following error while compiling MPICH:
  CC       src/mpltrmem.lo
/var/folders/qf/q3tp7kgn0gz6qj5_c2nr4qqm001qq3/T//ccyirdXM.s:491:suffix
or operands invalid for `movq'
/var/folders/qf/q3tp7kgn0gz6qj5_c2nr4qqm001qq3/T//ccyirdXM.s:495:suffix
or operands invalid for `movq'
make[2]: *** [src/mpltrmem.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2


When the assembler is suspicous ('movq') then it sure seems like there's a
toolchain mismatch.

Does this bug report from libressl sound like your environment?
https://github.com/libressl-portable/portable/issues/121

==rob


--
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA
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