Re: [RFT PATCH v4 0/8] Sysroot series

[Ralf Wildenhues]

* Charles Wilson wrote on Fri, Aug 06, 2010 at 02:47:59PM CEST:
> On 8/6/2010 1:19 AM, Ralf Wildenhues wrote:
> > Wrt. lib and lib32, lib64, can we find out all files GCC needs by asking
> > it several -print-* questions?  Plus maybe optimistically searching for
> > libc and ld*.so?
> 
> Well, if the test is skipped for $build=w32, maybe we can rely on ldd?
> That is, use the system compiler to build a hello world all, use ldd to
> figure out what libs it is linked to, and where they come from?

Sounds like a good idea, and not a big limitation.

Note that there are non-binutils ldd tools out there (Solaris, IRIX,
Tru64) where output differs at least in the amount of whitespace and
possibly additional empty lines; and AIX ldd may print things like:

$ ldd /bin/ls
/bin/ls needs:
         /usr/lib/libc.a(shr.o)
         /unix
         /usr/lib/libcrypt.a(shr.o)

and BSD ldd prepends "$prog:\n" etc.; in case of doubt looking at
gnulib/m4/ldd.m4 (or just ignoring all tools that don't look like GNU;
or just using the gnulib ldd.m4; however you like) helps.

Thanks,
Ralf