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* libgfortran.h (options_t): Add stderr_unit. * io/io.h (error_stream): Declare. * io/open.c (new_unit): Do not terminate abnormally if opening file preconnected to stdin, stdout, or stderr. * io/unit.c (init_units): Initialize stderr_unit. * io/unix.c (error_stream): New function. * runtime/environ.c (GFORTRAN_STDERR_UNIT): New environment variable. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@94090 138bc75d-0d04-0410-961f-82ee72b054a4