Missing dependencies in m2/ ?

[Jeff Law <jeffreyalaw@gmail.com>]

I've been getting sporatic errors like this since the introduction of 
the modula-2 front-end:

> In file included from ../../..//gcc/gcc/m2/mc-boot/GSFIO.c:29:
> ../../..//gcc/gcc/system.h:556:20: error: conflicting declaration of C function 'const char* strsignal(int)'
>   556 | extern const char *strsignal (int);
>       |                    ^~~~~~~~~
> In file included from /usr/include/c++/12/cstring:42,
>                  from ../../..//gcc/gcc/system.h:241:
> /usr/include/string.h:478:14: note: previous declaration 'char* strsignal(int)'
>   478 | extern char *strsignal (int __sig) __THROW;
>       |              ^~~~~~~~~
> In file included from ../../..//gcc/gcc/system.h:707:
> ../../..//gcc/gcc/../include/libiberty.h:112:14: error: ambiguating new declaration of 'char* basename(const char*)'
>   112 | extern char *basename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);
>       |              ^~~~~~~~
> /usr/include/string.h:524:26: note: old declaration 'const char* basename(const char*)'
>   524 | extern "C++" const char *basename (const char *__filename)
>       |                          ^~~~~~~~
> make[1]: *** [../../..//gcc/gcc/m2/Make-lang.in:1364: m2/mc-boot/GSFIO.o] Error 1


They seem to come and go without rhyme or reason.  For example build 
#1885 on lm32-elf failed, while #1884 passed.

Aside from the fact that I coonfigure with --enable-languages=c,c++ and 
yet modula-2 stuff still gets built (can that be fixed?) it seems like 
we're missing dependencies to ensure that the generated config.h file is 
made before building the modula-2 stuff.

In a good build you'll see something like this:

config.status: creating auto-host.h
[ ... ]
Build GSFIO.o:
g++ -g -c -I. -I../../..//gcc/gcc/m2/mc-boot-ch 
-I../../..//gcc/gcc/m2/mc-boot -I../../..//gcc/gcc/../include 
-I../../..//gcc/gcc -I. -Im2/mc-boot -I../../..//gcc/gcc 
-I../../..//gcc/gcc/m2/mc-boot -I../../..//gcc/gcc/../include 
-I../../..//gcc/gcc/../libcpp/include -I../../..//gcc/gcc/../libcody 
-I../../..//gcc/gcc/../libdecnumber 
-I../../..//gcc/gcc/../libdecnumber/dpd -I../libdecnumber 
-I../../..//gcc/gcc/../libbacktrace 
../../..//gcc/gcc/m2/mc-boot/GSFIO.c -o m2/mc-boot/GSFIO.o

Which naturally works just fine.

In a bad build, auto-host.h is _not_ created before trying to build GSFIO.o.

Can you please take care of this.  It's rather annoying to have builds 
failing in the continuous testing system like this, particularly when 
modula-2 isn't even enabled.

Jeff