[PATCH] debug/gdb: include expat for gdb-cross

Yann E. MORIN yann.morin.1998@free.fr
Sun Mar 3 14:58:00 GMT 2013


Trevor, All,

On Sunday 03 March 2013 Trevor Woerner wrote:
> On Sun, Mar 3, 2013 at 9:02 AM, Yann E. MORIN <yann.morin.1998@free.fr> wrote:
> > This is wrong:
> >   - 'do_expat' is used to detect whether the expat lib shall be downloaded
> >     and extracted;
> >   - 'do_expat' is then mis-used:
> >     - it is never used to build expat for the host, but is used to decide
> >       whether to enable/disable expat in the cross-gdb
> >     - it is used to decide whether to build expat for the target, but is
> >       always set when the native-gdb is selected, so the check is pointless.
> 
> So if I understand you correctly, the only thing the build needs to
> determine is if expat needs to be included in the sysroot?

Sorta. Crosstool-NG only builds a static version of libexpat, and never
installs it in the sysroot (ditto ncurses).

So, we only need to know whether we need to build expat (ncurses) for the
target, and point gdb's configure to the place we installed it.

The reason for not installing expat/ncurses in the sysroot is that the
libs are not part of the toolchain. They are only used for internal
components, and should not be exposed in the sysroot, in case the user
wants another version, or different compile flags, or a patched version.

This is purely internal to crosstool-NG.

> > What should be done is:
> >   - rename 'do_expat' to 'need_expat' (ditto for 'do_ncurses')
> >   - use 'need_expat' only to decide whether to download/extract libexpat
> >   - cross-gdb: always enable expat support
> >   - native-gdb: ditto
> 
> In other words, if the build doesn't interfere with gdb's ./configure,
> gdb's ./configure will naturally look for and link in the host's
> expat?

Almost, as we still need to tell the native-gdb's ./configure where to
find our internally built target expat/ncurses.

But for the cross-gdb, it should automatically find the host's libs,
indeed, so you still need to install the devel packages on your host.

Regards,
Yann E. MORIN.

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