This macro tries to find out how to compile programs that use OpenMP a standard API and set of compiler directives for parallel programming (see http://www-unix.mcs/)
On success, it sets the OPENMP_CFLAGS/OPENMP_CXXFLAGS/OPENMP_F77FLAGS output variable to the flag (e.g. -omp) used both to compile *and* link OpenMP programs in the current language.
NOTE: You are assumed to not only compile your program with these flags, but also link it with them as well.
If you want to compile everything with OpenMP, you should set:
CFLAGS="$CFLAGS $OPENMP_CFLAGS" #OR# CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS" #OR# FFLAGS="$FFLAGS $OPENMP_FFLAGS"
(depending on the selected language).
The user can override the default choice by setting the corresponding environment variable (e.g. OPENMP_CFLAGS).
ACTION-IF-FOUND is a list of shell commands to run if an OpenMP flag is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is not found. If ACTION-IF-FOUND is not specified, the default action will define HAVE_OPENMP.
Download the latest version of ax_openmp.m4 or browse the macro’s revision history.
Copyright © 2008 Steven G. Johnson email@example.com
Copyright © 2015 John W. Peterson firstname.lastname@example.org
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