🚀 go-pugleaf

It seems the preprocessor in GCC 2.3.1 sometimes gets confused as to
what file to report errors in.  Consider the following five-line file foo.c:

extern int a;
extern int b;
#line 1 "./foo.y"
foo
#include "foo.h"

And the one-line file foo.h:

extern int x;

Running `gcc foo.c' reports the error at the erroneous `foo' as follows:

In file included from foo.c:2:
./foo.h:1: syntax error before `extern'

That should be `In file included from foo.y:2:'.  Line two of foo.c is
not in error.

This was on a 486 running Interactive Unix 2.2.1 (configured as
--with-gnu-as i386-isc), and also on an IBM RT running AOS/4.3BSD
(configured as romp-aos), but I doubt the bug is system-dependent.

On the 486, the complete -v output is the following:

Reading specs from /usr/local/gnu/lib/gcc-lib/i386-isc/2.3.1/specs
gcc version 2.3.1
 /usr/local/gnu/lib/gcc-lib/i386-isc/2.3.1/cpp -lang-c -v -undef -D__GNUC__=2 -Dunix -Di386 -D__unix__ -D__i386__ -D__unix -D__i386 foo.c /tmp/cca21680.i
GNU CPP version 2.3.1 (80386, BSD syntax)
 /usr/local/gnu/lib/gcc-lib/i386-isc/2.3.1/cc1 /tmp/cca21680.i -quiet -dumpbase foo.c -version -o /tmp/cca21680.s
GNU C version 2.3.1 (80386, BSD syntax) compiled by GNU C version 2.3.1.
In file included from foo.c:2:
./foo.h:1: syntax error before `extern'