crt0.o from newlib has ARM32-only routines when building gcc for arm-eabi

[David Fernandez <david dot fernandez dot work at googlemail dot com>]

Hi there,

I've been building a arm-eabi toolchain recently, using binutils-2.22,
gcc-4.7.1 and newlib-1.20.0 (I think).

The problem is that when I build for cortex-m3 (-march=armv7-m
-mcpu=cortex-m3 -mthumb), I get the routine _CRTStartup assembled as
ARM32 (definitely not thumb or thumb-2). The file crt0.o seems generated
during gcc build.

Is that expected? As crt0.S in newlib has #ifdefs to choose the right
thumb-2, thumb or ARM specific assembler depending on the predefined macros.

The only thing I can think of is that it might be forced by the gcc
build system, perhaps because linux does not support thumb-only
platforms (?)...

It might be a very silly thing, but if anybody could tell what is the
problem, it would be great.

Cheers
David Fernandez

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