[PATCH] PR123012 Namelist input of variable accessed by use association with renaming fails

[Jerry D]

Planning to commit this soon.

Patch developed by Steve. I did one fix-up after reading that
giving strlen a NULL pointer can be undefined on some systems.

Regression tested on x86_64-linux-gnu.

Thanks Steve.

Regards all,

Jerry

$ git show
commit 2df097c4934ac47eadbd8b9b5d23e7bec8bb1049 (HEAD -> master)
Author: Steve Kargl <kargl@gcc.gnu.org>
Date:   Wed Jan 7 15:14:23 2026 -0800

     Fortran: Fix namelist with use association and renaming

             PR fortran/123012

     gcc/fortran/ChangeLog:

             * trans-io.cc (transfer_namelist_element): Adjust the
             conditions determining when to use the local name or
             the var name to build the object name.

     gcc/testsuite/ChangeLog:

             * gfortran.dg/namelist_99.f90: New test.

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