Re: [PATCH 6/13] Coarray shared memory library

On Thu, Feb 12, 2026 at 08:17:21PM -0800, Steve Kargl wrote:
> On Wed, Feb 11, 2026 at 10:58:32AM +0100, Tobias Burnus wrote:
> > Jerry D wrote:
> > > +    foreach flags $option_list {
> > > +        verbose "Testing $nshort (libcaf_shmem), $flags" 1
> > > +        set gfortran_aux_module_flags "-fcoarray=lib $flags -lcaf_shmem"
> > > +        dg-test $test "-fcoarray=lib $flags -lcaf_shmem" {}
> > > +        cleanup-modules ""
> > > +    }
> > 
> > As mentioned in 13/13, the current implementation seems to assume that POSIX
> > threads are available; additionally, -lpthread or -pthread might be needed
> > for linking. In any case, it seems as if some check is required whether
> > caf_shmem is actually available; otherwise, the shmem tests have to be
> > skipped.
> > 
> 
> Unfortunately, I don't know how to fix.  In libgomp/configure.txt one sees
> 
> % more libgomp/configure.txt
> # This is the target specific configuration file.  This is invoked by the
> # autoconf generated configure script.  Putting it in a separate shell file
> # lets us skip running autoconf when modifying target specific information.
> 
> # This file switches on the shell variable ${target}, and sets the
> # following shell variables:
> #  config_path          An ordered list of directories to search for
> #                       sources and headers.  This is relative to the
> #                       config subdirectory of the source tree.
> #  XCFLAGS              Add extra compile flags to use.
> #  XLDFLAGS             Add extra link flags to use.
> #  tmake_file           A list of machine-description-specific
> #                       makefile fragments.
> ...
>   *-*-freebsd*)
>         # Need to link with -lpthread so libgomp.so is self-contained.
>         XLDFLAGS="${XLDFLAGS} -lpthread"
>         ;;
> 
> It looks like AIX also needs -lpthread added to its linker flags.  
> In libgfortran/configure.host, there are target specific checks,
> but adding the above with would unconditional add -lpthread to 
> the linker flags even if caf_shmem is not used.

If I manually add -lpthread to caf.exp, then I see

                === gfortran Summary ===

# of expected passes            74989
# of unexpected failures        37
# of expected failures          343
# of unsupported tests          95
/home/kargl/gcc/obj/gcc/gfortran  version 16.0.1 20260204 (experimental) (GCC) 

which means caf_shmem seems to work on FreeBSD.
-- 
Steve