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Re: CrossGCC FAQ update.
Michael Schwingen wrote:
>
> On Thu, May 06, 1999 at 07:24:52PM +0000, Jonathan Larmour wrote:
>
> [libiberty]
> > > > Do I have a choice ?
> >
> > No. It is required by gcc and others.
>
> Hm - when compiling, or on the target?
Sorry, only when compiling. The target doesn't (necessarily) need it,
although it may be required if you are using more complex stuff like
libstdc++ on the target.
> > To reduce the number of multilibs, edit the appropriate file commencing with
> > "t-" in the relevant subdirectory of gcc/config. For example, the options
> > for m68k-elf are in "gcc/config/m68k/t-m68kelf". The macros to change are
> > MULTILIB_OPTIONS, MULTILIB_DIRNAMES, MULTILIB_MATCHES and
> > MULTILIB_EXCEPTIONS.
>
> Ah, great - that *definitely* belongs in the FAQ, IMHO.
I should add that these options are documented in the GCC info files. The
above ones are under "Fragments->Target Fragment" in gcc.texi. It is also
worth looking at MULTILIB_DEFAULTS in "Target Macros->Driver" in tm.texi,
which I forgot to mention. With the example above, MULTILIB_DEFAULTS would
be defined in gcc/config/m68k/m68k-none.h (although this file is included
from the specific m68k files as it happens on m68k).
> > > - how do I disable building all these other libraries I do not need, but
> > > which cause compilation errors sometimes?
> >
> > The simplest answer is probably just to move them out of the way
> > temporarily. Even just renaming them will work, e.g. "mv libstdc++
> > libstdc++.foo"
>
> That's what I did (and edit the toplevel Makefile, IIRC). However, it would
> be nice if I could simply tell configure that I want to build a 'small'
> compiler without the optional stuff - that would make it a lot easier do
> automatically build new compiler versions.
If you're using the "build from one tree" approach (as you should), you
shouldn't need to change the makefile, I believe. It should detect what is
and is not present.
But there's no explicit way to do it from the command-line. It would be
desirable, but would take a bit of effort. Volunteers to do it would be
welcome, of course :-).
Jifl
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