libsodium segment fault on ARMv5 - c

Question

I can use libsodium 1.0.7 just fine in Ubuntu but there seems to be some issue when trying to cross-compile the libsodium library to an armv5 architecture (armv5tejl-unknown-linux-gnueabihf).
I have used ./configure --host=armv5tejl-unknown-linux-gnueabihf and then make DESTDIR=/home/myself/ARM/.
All files are generated fine (headers and static & shared library files) and I can compile and link a small test C-program which then generates a segmentation fault when it's executed on my ARMv5 target (toolchain and all is fine, everything else I compile & link not using libsodium runs perfectly fine on my ARM machine):
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sodium.h"
int main()
{
printf("sodium_init()=%d\n",sodium_init()); // Fine, = 0
unsigned char pbk[crypto_box_PUBLICKEYBYTES];
unsigned char sbk[crypto_box_SECRETKEYBYTES];
crypto_box_keypair(pbk,sbk); // <-- Segmentation fault.
}
I have also tried the official cross-compile for ARM instructions at https://download.libsodium.org/doc/installation/index.html but configure fails due to a missing nosys.specs file. Is there somewhere I can download this (I have goggled it and it seems that it has to be specifically generated for the libsodium package)?

Answer 1

I managed to solve it with some help here : github.com/jedisct1/libsodium/issues/331
– Tias
Right, I finally managed to make it run on my ARMv5 target by doing
the following, many thanks for pointing me to the ARM toolchain that
contained the nosys.spec & libnosys.a files :
Downloaded ARM toolchain
gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2 from
https://launchpad.net/gcc-arm-embedded
Downloaded libsodium-1.0.7 from https://download.libsodium.org/libsodium/releases/
Note: This is for making a static
libsodium.a Example below assuming home folder =
/home/user tar xvjf gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2
tar xvzf libsodium-1.0.7.tar.gz
cp ./gcc-arm-none-eabi-4_9-2015q3/arm-none-eabi/lib/nosys.spec ./libsodium-1.0.7/
cp ./gcc-arm-none-eabi-4_9-2015q3/arm-none-eabi/lib/libnosys.a ./libsodium-1.0.7/ Folder gcc-arm-none-eabi-4_9-can
be deleted at this point. cd ./libsodium-1.0.7/
mkdir ARMv5
export LDFLAGS='-static -g --specs=nosys.specs -L/home/user/libsodium-1.0.7/ -lnosys -lc'
./configure --host=armv5tejl-unknown-linux-gnueabihf --enable-static --prefix=/home/user/libsodium-1.0.7/ARMv5/
make DESTDIR=/home/user/libsodium-1.0.7/ARMv5/ Key
discoveries for me : Hint from jedisct1 where to get the
ARM toolchain containing both the nosys.spec and
libnosys.a files. Found out to add linker flag
-lc to make libsodium with libc (contaning
__libc_start_main, abort,
__libc_csu_fini and __libc_csu_init)