https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126116
--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by Jerry DeLisle <[email protected]>: https://gcc.gnu.org/g:2463358ca6a787216d3ef59cd2f0566cdbf59eb0 commit r15-11364-g2463358ca6a787216d3ef59cd2f0566cdbf59eb0 Author: Jerry DeLisle <[email protected]> Date: Wed Jul 8 10:22:04 2026 -0700 fortran: [PR126116] Internal file I/O corrupts NEWUNIT state Before this fix, Performing an internal file I/O (such as WRITE to a character variable) incorrectly corrupts the internal unit management table in libgfortran. This patch adds a bool to the gfc_unit structure to allow tracking whether a gfc_unit was created for purposes of internal I/O to avoid the breakage. PR libfortran/126116 libgfortran/ChangeLog: * io/io.h (struct gfc_unit): Add bool for tracking. Fix some white space problems. * io/unit.c (close_unit_1): Add a declaration for this function so it can be called before it has been defined. Use the new bool. (is_internal_reserved): New helper function. Returns true only if the unit is not null and the internal unit kind is zero meaning its not a character string. (find_unit): Use the new helper function (find_or_create_unit): Use the new helper. (get_unit): Set the new bool. (close_unit): Update the close_unit_1 argument list. (close_units): Likewise. gcc/testsuite/ChangeLog: * gfortran.dg/pr126116.f90: New test. (cherry picked from commit 11be877aea73b0b26638078908a42dd0f97d81d7)
