Building with Musl

[Andrew Bainbridge]

Hi all

Are there any instructions on how to build Dropbear with Musl (an alternative libc)? There's a brief mention of it on the Dropbear homepage, but nothing in INSTALL.

I'm building on a Raspberry Pi 3, running Raspbian 8 (Jesse). I'm attempting to build a dbclient that will run on a slightly odd Qualcomm Snapdragon based embedded Linux device. Both the Pi and the Snapdragon use the ARMv7 instruction set, so this should be easy.

Here's what I've tried...

Got https://www.musl-libc.org/releases/musl-1.1.15.tar.gz.
./configure and then make install. All good.

Got http://zlib.net/zlib-1.2.8.tar.xz.
export PATH="$PATH:/usr/local/musl/bin"
export CC=musl-gcc
./configure --static. make. All good.

Got https://matt.ucc.asn.au/dropbear/releases/dropbear-2016.73.tar.bz2.
export CFLAGS="-I ../zlib-1.2.8"
export LDFLAGS="-L ../zlib-1.2.8"
./configure
make PROGRAMS="dbclient" STATIC=1
Not all good :-(

Lots of stuff built. I've got libtommath.a and libtomcrypt.a. But make dies saying:

musl-gcc -I ../zlib-1.2.8 -I./libtomcrypt/src/headers/ -I. -I.  -I../zlib-1.2.8 -DDROPBEAR_CLIENT   -c -o dbutil.o dbutil.c
In file included from dbutil.c:64:0:
includes.h:160:25: fatal error: linux/types.h: No such file or directory
#include <linux/types.h>
                         ^
compilation terminated.
<builtin>: recipe for target 'dbutil.o' failed
make: *** [dbutil.o] Error 1

I’m pretty sure a Musl build should even try to #include linux/types.h. Any ideas?

Thanks,
Andy
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