Hi Lance,

Can try adding the "--compiler=gcc" flag to your configure.py command? That should use your custom gcc compiler since it's the first one that's found on your path. When you run "make," you should see a line that looks like "On MacOS, using  gcc 4.8.5", but with your version of gcc. The latest gcc that I have tested is 5.4.0 on Ubuntu 16.04, so I do not know if everything will compile with gcc 6.3.0

--
Billy K. Poon
Research Scientist, Molecular Biophysics and Integrated Bioimaging
Lawrence Berkeley National Laboratory
1 Cyclotron Road, M/S 33R0345
Berkeley, CA 94720
Tel: (510) 486-5709
Fax: (510) 486-5909

On Wed, Aug 16, 2017 at 2:49 PM, Lance Westerhoff <lance@quantumbioinc.com> wrote:

Hello All-

How does one introduce an alternate gcc compiler for CCTBX on Mac? I must be missing it in the documentation.

I don’t want to use the old one in /usr/bin (and instead I want to you my newer one in /opt/gcc). I’ve tried all of the standard methods used by other build systems (change the $PATH, set $CXX and $CC, etc) but to no avail. These environment variables seem to be disregarded. We do use this compiler for building CCTBX on linux without too much trouble, so I think the support should be there.

Specifically:

mac-build64:build jenkins$ env | grep CXX
CXX=/opt/gcc/current/bin/g++

mac-build64:build jenkins$ env | grep CC
CC=/opt/gcc/current/bin/gcc

mac-build64:build jenkins$ which gcc
/opt/gcc/current/bin/gcc

mac-build64:build jenkins$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/gcc/gcc-6.3.0-08092017/libexec/gcc/x86_64-apple-darwin11.4.2/6.3.0/lto-wrapper
Target: x86_64-apple-darwin11.4.2
Configured with: ../gcc-6.3.0/configure --prefix=/opt/gcc/gcc-6.3.0-08092017 --enable-languages=c,c++,fortran,objc --with-gmp=/opt/gcc/gcc-6.3.0-08092017 --with-mpfr=/opt/gcc/gcc-6.3.0-08092017 --with-mpc=/opt/gcc/gcc-6.3.0-08092017 --enable-libgomp --disable-multilib
Thread model: posix
gcc version 6.3.0 (GCC)

mac-build64:build jenkins$ /opt/python/current/bin/python ../modules/cctbx_project/libtbx/configure.py cctbx
Python: 2.7.9 "/opt/python/current/bin/python"
Compiler: default
....
This script is only applicable to Linux - exiting.
Done.

mac-build64:build jenkins$ make
./bin/libtbx.scons -j "`./bin/libtbx.show_number_of_processors`"
scons: Reading SConscript files ...
On MacOS, using  clang 4.2.0
Xcode 4.6.3
Build version 4H1503
...


Thanks for your help!

-Lance
____________________
Lance M. Westerhoff, Ph.D.
President and General Manager
QuantumBio Inc.

WWW:    http://www.quantumbioinc.com
Email:    lance@quantumbioinc.com




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