built-in recognition bug in gcc 2.2.2

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Article #27

#27

From: Jason Merrill
Date: Sat, 31 Oct 1992 22:48

39 lines
1401 bytes

When building the GNU m4-1.0 distribution, the obstack.c compile died with
the error

obstack.c:26: conflicting types for `abort'
<built-in>:0: previous declaration of `abort'

Now, according to c-decl.c, 

...
  else if (TREE_CODE (olddecl) == FUNCTION_DECL
	   && DECL_BUILT_IN (olddecl))
    {
      if (!TREE_PUBLIC (newdecl))
	{
	...
	}
      else if (!types_match)
	warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
    }
...

So it seems to me this should be a warning, not an error.  So I stepped
through here with gdb, and found that although olddecl->decl->filename was
set to "<built-in>", olddecl->decl->bit_field_flag was 0, indicating that
the function was not built in...

Here is an input file which reproduces the bug:

-----
int abort();

main()
{
}
-----

--
Jason Merrill
jason@jarthur.claremont.edu

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Message-ID: <1992Oct31.224846.10131@muddcs.claremont.edu>

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From: jason@jarthur.claremont.edu (Jason Merrill)
Subject: built-in recognition bug in gcc 2.2.2
Message-ID: <1992Oct31.224846.10131@muddcs.claremont.edu>
Sender: gnulists@ai.mit.edu
Organization: Harvey Mudd College, Claremont, CA 91711
Distribution: gnu
Date: Sat, 31 Oct 1992 22:48:46 GMT
Approved: bug-gcc@prep.ai.mit.edu
Lines: 40