[Bug ada/11581] [3.4 Regression] gnat1 segfaults if it does receive any arguments

["ro at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11581


ro at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ro at techfak dot uni-
                   |                            |bielefeld dot de


------- Additional Comments From ro at gcc dot gnu dot org  2003-07-24 19:57 -------
The same problem happens with jc1 and f771 on sparc-sun-solaris2.8.  It seems to
happen on all platforms which crash on strlen(NULL).

All crashes show the same stack trace:

#0  0xff1b3200 in strlen () from /usr/lib/libc.so.1
#1  0x00490ff4 in output_file_directive (asm_file=0x879898, input_name=0x0)
    at /vol/gnu/src/gcc/gcc-dist/gcc/toplev.c:1403
#2  0x00495e14 in init_asm_output (name=0x657800 "")
    at /vol/gnu/src/gcc/gcc-dist/gcc/toplev.c:4077
#3  0x004966ac in lang_dependent_init (name=0x0)
    at /vol/gnu/src/gcc/gcc-dist/gcc/toplev.c:4409
#4  0x0049694c in do_compile () at /vol/gnu/src/gcc/gcc-dist/gcc/toplev.c:4517
#5  0x00496a78 in toplev_main (argc=1, argv=0xffbef4cc)
    at /vol/gnu/src/gcc/gcc-dist/gcc/toplev.c:4567

In toplev.c (output_file_directive), strlen is called with a NULL input_name.
The fix may be to simply initialize toplev.c (main_input_filename) to <stdin>,
as cppfiles.c does.  cc1, cc1plus, and cc1obj are not affected and simply
emit <stdin>.s instead.