Re: How to request -mthumb to be applied to all tools built for arm

["Yann E. MORIN" <yann dot morin dot 1998 at anciens dot enib dot fr>]

Hello Lev!
Hello All!

On Tuesday 29 December 2009 14:05:45 lev@lingnu.com wrote:
> I was trying to use CT_TARGET_CFLAGS=-mthum -mthumb-interwork to reduce
> size of all utilities and libs which I build using crosstoll v1.5.1
> But  it did not produce reduced binaries.

crosstool-NG 1.5.x and before do not support Thumb and Interworking,
see below.

> Please advice, how to make crosstols to produce reduced utilities and make
> it gcc default.

Please try with the mercurial repository. There is integrated support for
Thumb and interworking in there. It's still experimental, so you'll have
to enable EXPERIMENTAL:
  Paths and misc options  --->
    [*] Try features marked as EXPERIMENTAL
  Target options  --->
    Target Architecture (arm)  --->
    Default instruction set mode (thumb (EXPERIMENTAL))  --->
    [ ] Use Thumb-interworking (READ HELP)

This *should* build a toolchain with Thumb-compiled libraries (C library,
libstdc++, libgcc, and so on...), and that will generate Thumb binaries
by default, without the need to use -mthumb every time you call gcc.

And please report back whether it works for you.

Regards,
Yann E. MORIN.

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