Open MPI with icc: "Open MPI requires a C99 compiler"

Question

If I run

../configure CC=icc CXX=icpc F77=ifort FC=ifort

the configuring stops with

============================================================================
== Compiler and preprocessor tests
============================================================================

*** C compiler and preprocessor
checking for gcc... (cached) icc
checking whether we are using the GNU C compiler... (cached) yes
checking whether icc accepts -g... (cached) yes
checking for icc option to accept ISO C89... (cached) none needed
checking whether icc understands -c and -o together... (cached) yes
checking for icc option to accept ISO C99... unsupported
configure: WARNING: Open MPI requires a C99 compiler
configure: error: Aborting.

I'm trying to build Open MPI 3.0.0 from source. I'm using the Intel compilers version 18.0.0 20170811. The environment is Arch Linux.

Why is Open MPI having a problem with icc not being C99 compliant?

Have a look at software.intel.com/en-us/articles/… and open-mpi.org/faq/?category=building#build-intel-compilers — Vladimir F Героям слава
– Vladimir F Героям слава, Commented Nov 15, 2017 at 17:31
@HighPerformanceMark Specifying CFLAGS="-std=c99" didn't make a difference. — Raul Laasner
– Raul Laasner, Commented Nov 15, 2017 at 17:36
@VladimirF I checked those websites but I still believe I'm doing everything correctly. — Raul Laasner
– Raul Laasner, Commented Nov 15, 2017 at 17:36
I'm surprised that nothing comes up when I google this issue. What I'm trying to do is clearly a standard procedure. Maybe there's something different in the newest versions of OpenMPI or the Intel compilers. — Raul Laasner
– Raul Laasner, Commented Nov 15, 2017 at 17:36
It might be the new OpenMPI 3 problem. Can you have a look into the config.log file to see which exact test was performed and what kind of error was reported? — Vladimir F Героям слава
– Vladimir F Героям слава, Commented Nov 15, 2017 at 18:18

Raul Laasner · Accepted Answer · 2017-11-15 18:51:45Z

1

There seems to be a problem with the latest ICC if used in combination with glibc 2.26. The problem is still present with version 18.0.0. For now, the fix is to include the flag -D_Float128=__float128:

../configure CC=icc CXX=icpc FC=ifort CFLAGS="-D_Float128=__float128"

answered Nov 15, 2017 at 18:51

Raul Laasner

1,5951 gold badge19 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Raul Laasner Over a year ago

@pds Arch Linux.

Stephen Rauch · Accepted Answer · 2018-09-28 01:22:09Z

0

If you don't need to use the classic C++ you can choose to compile with C99

../configure C99=icc CXX=icpc FC=ifort

edited Sep 28, 2018 at 1:22

Stephen Rauch♦

50.1k32 gold badges118 silver badges143 bronze badges

answered Sep 28, 2018 at 0:55

user10426959

1

Collectives™ on Stack Overflow

Open MPI with icc: "Open MPI requires a C99 compiler"

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related