[Bug fortran/125324] -fcoarray=shared should imply -pthread / gfortran.dg/coarray_51.f90 FAILs with undefined reference to `pthread_mutex_trylock'

[jvdelisle at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125324

Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2026-05-21
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #2 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Tobias, is this machine this problem is on part of the compiler farm?

If so I could test myself. If not, here is a draft patch:


diff --git a/gcc/fortran/gfortranspec.cc b/gcc/fortran/gfortranspec.cc
index 13b240013e8..d2aaf3e4e59 100644
--- a/gcc/fortran/gfortranspec.cc
+++ b/gcc/fortran/gfortranspec.cc
@@ -428,7 +428,10 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.\n\n"
        }

       if (need_caf_shmem)
-       append_option (OPT_l, CAF_SHMEM_LIBRARY, 1);
+       {
+         append_option (OPT_pthread, NULL, 1);
+         append_option (OPT_l, CAF_SHMEM_LIBRARY, 1);
+       }
     }

 #ifdef ENABLE_SHARED_LIBGCC

I need to know if it fixes it.