Previously, invalid C/C++ wrappers calling Fortran subroutines with single-character string arguments that failed to include the hidden string length argument could cause a crash at run-time. The crash could occur because when tail call optimization takes place, the caller's arguments are overwritten, which could have lead to stack corruption if the string length argument hadn't been provided. GCC offers a workaround for this problem; the -ftail-call-workaround option is now available, which disables tail call optimization for Fortran subroutines with character arguments. Red Hat recommends that users fix the C/C++ wrappers instead of using this workaround option.