https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125059
--- Comment #18 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-16 branch has been updated by Harald Anlauf <[email protected]>: https://gcc.gnu.org/g:ef03d3cfb45e0d75c137223c805ad75a3b7e319d commit r16-8905-gef03d3cfb45e0d75c137223c805ad75a3b7e319d Author: Harald Anlauf <[email protected]> Date: Thu May 7 22:34:52 2026 +0200 Fortran: fix automatic deallocation with derived type IO [PR111952,PR125059] The implementation of derived type IO wrongly forced allocatable instances of the DT as static, which prevented automatic deallocation of local variables. The motivation was an attempt to prevent optimizations leading to certain testcase failures. Howver, the underlying reason of the problem was a wrong fnspec of _gfortran_transfer_derived that declared the IO variable as being only read ('r'). Declare the corresponding parameter as being written ('w'). PR fortran/111952 PR fortran/125059 gcc/fortran/ChangeLog: * trans-decl.cc (gfc_finish_var_decl): Remove bogus code forcing a DT variable with DTIO as static. * trans-io.cc (gfc_build_io_library_fndecls): Fix fnspec attribute. gcc/testsuite/ChangeLog: * gfortran.dg/dtio_37.f90: New test. (cherry picked from commit 1904b9207203bbe45d6ce6a472d6a0c7e1bbd873)
