Bruno Haible <bruno@xxxxxxxxx> writes:
> 2007-05-17 Bruno Haible <bruno@xxxxxxxxx>
>
> * lib/autoconf/c.m4 (_AC_LANG_OPENMP, AC_OPENMP): New macros.
> * doc/autoconf.texi (Generic Compiler Characteristics): Document
> AC_OPENMP.
> * NEWS: Mention AC_OPENMP.
Thanks much. I installed that, after tweaking the documentation a
bit. Here's the documentation I installed:
@defmac AC_OPENMP
@acindex{OPENMP}
@cvindex _OPENMP
OpenMP (@url{http://www.openmp.org/}) specifies extensions of C, C++,
and Fortran that simplify optimization of shared memory parallelism,
which is a common problem on multicore CPUs.
If the current language is C, the macro @code{AC_C_OPENMP} sets the
variable @code{OPENMP_CFLAGS} to the C compiler flags needed for
supporting OpenMP@. @code{OPENMP_CFLAGS} is set to empty if the
compiler already supports OpenMP, if it has no way to activate OpenMP
support, or if the user rejects OpenMP support by invoking
@samp{configure} with the @samp{--disable-openmp} option.
@code{OPENMP_CFLAGS} needs to be used when compiling programs, when
preprocessing program source, and when linking programs. Therefore you
need to add @code{$(OPENMP_CFLAGS)} to the @code{CFLAGS} of C programs
that use OpenMP@. If you preprocess OpenMP-specific C code, you also
need to add @code{$(OPENMP_CFLAGS)} to @code{CPPFLAGS}. The presence of
OpenMP support is revealed at compile time by the preprocessor macro
@code{_OPENMP}.
Linking a program with @code{OPENMP_CFLAGS} typically adds one more
shared library to the program's dependencies, so its use is recommended
only on programs that actually require OpenMP.
If the current language is C++, @code{AC_OPENMP} sets the variable
@code{OPENMP_CXXFLAGS}, suitably for the C++ compiler. The same remarks
hold as for C.
If the current language is Fortran 77 or Fortran, @code{AC_OPENMP} sets
the variable @code{OPENMP_FFLAGS} or @code{OPENMP_FCFLAGS},
respectively. Similar remarks as for C hold, except that
@code{CPPFLAGS} is not used for Fortran, and no preprocessor macro
signals OpenMP support.
@end defmac
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