[gentoo-musl] Anyone had any luck with an ARMv5 softfloat toolchain?

[Stuart Longland]

Hi all,

Has anyone had any luck building a cross toolchain for ARMv5 (softfloat)?

binutils and gcc (stage 1) build without issue:
> # armv5tel-softfloat-linux-musleabi-gcc --version
> armv5tel-softfloat-linux-musleabi-gcc (Gentoo 5.4.0-r3 p1.3, pie-0.6.5) 5.4.0
> Copyright (C) 2015 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> # armv5tel-softfloat-linux-musleabi-as --version
> GNU assembler (Gentoo 2.27 p1.0) 2.27
> Copyright (C) 2016 Free Software Foundation, Inc.
> This program is free software; you may redistribute it under the terms of
> the GNU General Public License version 3 or later.
> This program has absolutely no warranty.
> This assembler was configured for a target of `armv5tel-softfloat-linux-musleabi'.

musl libc?  Not so much:

> armv5tel-softfloat-linux-musleabi-gcc -std=c99 -nostdinc -ffreestanding -fexcess-precision=standard -frounding-math -Wa,--n
> oexecstack -D_XOPEN_SOURCE=700 -I./arch/arm -I./arch/generic -Iobj/src/internal -I./src/internal -Iobj/include -I./include
>  -pipe -fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -Werror=
> implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -include vis.h -O2 -pipe -Wl,
> --sort-section,alignment -Wl,--sort-common -Wl,--gc-sections -Wl,--hash-style=both -Wl,--no-undefined -Wl,--exclude-libs=AL
> L -Wl,-Bsymbolic-functions -Wl,-O1 -Wl,--as-needed -nostdlib -shared \
> -Wl,-e,_dlstart -o lib/libc.so (… lots of .lo files…) -lgcc
> rm -f lib/libc.a
> armv5tel-softfloat-linux-musleabi-ar rc lib/libc.a (… lots of files)
> armv5tel-softfloat-linux-musleabi-ranlib lib/libc.a
> /usr/libexec/gcc/armv5tel-softfloat-linux-musleabi/ld: cannot find crt1.o: No such file or directory
> /usr/libexec/gcc/armv5tel-softfloat-linux-musleabi/ld: cannot find crti.o: No such file or directory
> /usr/libexec/gcc/armv5tel-softfloat-linux-musleabi/ld: cannot find -lc
> /usr/libexec/gcc/armv5tel-softfloat-linux-musleabi/ld: cannot find crtn.o: No such file or directory
> collect2: error: ld returned 1 exit status

For the sake of brevity on a mailing list I have chopped a bit out of
that build log, but I can post the full version somewhere if people want
to have a look.

My aim is to bootstrap an armv5te environment for running on some
industrial computers, which could really benefit from use of musl rather
than glibc.  (128MB RAM only goes so far.)

Regards,
-- 
Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind...
  ...it's backed up on a tape somewhere.