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

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.

-- 
Steve