Create a static GCC Musl toolchain for ARM device

Michele13 · 05-11-2018, 09:43 AM

Hello Everybody! This is my first post, I hope you can help me.

I love a lot to compile things from source, and recentrly I've discovered the Musl libc library. I use it to cross-compile simple static binaries such as busybox, rsync, etc. Now I would like to cross-compile a static host-x-host compiler for arm. I'm using the following sources packages:

Binutils 2.30
GCC 7.3.0
GMP 6.1.2
MPC 1.1.0
MPFR 4.0.1
Linux 4.15.3
Musl (libc) 1.1.19

I've managed to build everything successfully, however when I try to build a C Program such as "Hello World" it outputs this error:

Code:

/home/michele/tmp/a.out:(.data+0x0): multiple definition of `__dso_handle'
/home/michele/tmp/toolchain/output/lib/gcc/arm-linux-musleabi/7.3.0/crtbegin.o:(.data+0x0): first defined here
/home/michele/tmp/a.out: In function `_init':
:(.init+0x0): multiple definition of `_init'
/home/michele/tmp/toolchain/output/lib/gcc/arm-linux-musleabi/7.3.0/../../../../arm-linux-musleabi/lib/crti.o:(.init+0x0): first defined here
/home/michele/tmp/a.out: In function `_start':
:(.text+0x0): multiple definition of `_start'
/home/michele/tmp/toolchain/output/lib/gcc/arm-linux-musleabi/7.3.0/../../../../arm-linux-musleabi/lib/crt1.o:crt1.c:(.text+0x0): first defined here
/home/michele/tmp/a.out: In function `_start_c':
:(.text+0x1c): multiple definition of `_start_c'
/home/michele/tmp/toolchain/output/lib/gcc/arm-linux-musleabi/7.3.0/../../../../arm-linux-musleabi/lib/crt1.o:crt1.c:(.text._start_c+0x0): first defined here
/home/michele/tmp/a.out: In function `main':
:(.text+0xe8): multiple definition of `main'
/tmp/ccegcMMo.o:hello.c:(.text+0x0): first defined here
/home/michele/tmp/a.out: In function `_fini':
:(.fini+0x0): multiple definition of `_fini'
/home/michele/tmp/toolchain/output/lib/gcc/arm-linux-musleabi/7.3.0/../../../../arm-linux-musleabi/lib/crti.o:(.fini+0x0): first defined here
/home/michele/tmp/toolchain/output/lib/gcc/arm-linux-musleabi/7.3.0/crtend.o:(.tm_clone_table+0x0): multiple definition of `__TMC_END__'
/home/michele/tmp/a.out::(.data+0x4): first defined here
/home/michele/tmp/toolchain/output/lib/gcc/arm-linux-musleabi/7.3.0/libgcc.a(_dvmd_lnx.o): In function `__aeabi_idiv0':
/home/michele/tmp/toolchain/tmp/build-gcc/arm-linux-musleabi/libgcc/../../../src/gcc/libgcc/config/arm/lib1funcs.S:1545: undefined reference to `raise'
collect2: error: ld returned 1 exit status

I have installed qemu-user-static and binfmt-support, this way I am able to run gcc. What could have I done wrong? Could someone instruct me to build a static relocatable native host-x-host cross-compiler for arm? It needs to run on armv6 (and beyond) with soft floating point.

I already have a cross-compiler, i've built it using the same package versions and it works. I'm using it to build this version of GCC

Thanks for the help

P.S feel free to correct my English, I usually don't pay too much attention on how I write when I post a topic because I'm too focused on my problem

AwesomeMachine · 05-11-2018, 09:55 PM

The second last line is what cause ld to fail. Can I look at the command line your using?

Michele13 · 05-12-2018, 02:16 AM

Create Sysroot directory

Code:

mkdir -p /home/michele/tmp/toolchain/output/arm-linux-musleabi/
ln -s . /home/michele/tmp/toolchain/output/arm-linux-musleabi/usr

Linux Headers

Code:

make mrproper
ARCH=arm make headers_check
ARCH=arm make INSTALL_HDR_PATH=/home/michele/tmp/toolchain/output/arm-linux-musleabi/ headers_install

Musl Libc
Inside the Musl Libc folder I run:

Code:

./configure --target=arm-linux-musleabi --disable-shared --prefix=/
make
make DESTDIR=/home/michele/tmp/toolchain/output/arm-linux-musleabi/usr install

Now I export some variables to make binutils and GCC static.

Code:

export CC="arm-linux-musleabi-gcc -static -Wl,-Bstatic -static-libgcc
export CXX="arm-linux-musleabi-g++ -static -Wl,-Bstatic -static-libgcc

Binutils

Code:

../src/binutils/configure --host=arm-linux-musleabi --target=arm-linux-musleabi --build=x86_64-linux-gnu --prefix=/home/michele/tmp/toolchain/output --disable-nls --disable-multilib --disable-shared
make
make install

GCC

Code:

../src/gcc/configure --host=arm-linux-musleabi --target=arm-linux-musleabi --build=x86_64-linux-gnu --enable-languages=c,c++ --disable-nls --disable-multilib --disable-libsanitizer --disable-shared --disable-libmudflap --prefix=/home/michele/tmp/toolchain/output/ --with-arch=armv7 --with-float=soft
make
make install

Yes, I've disabled shared libraries so all the programs that will be compiled by the final compiler will be static

AwesomeMachine · 05-13-2018, 03:29 PM

It's helpful that you posted all that stuff, but which command gives you the error in the first post? ld is the linker. So, something is looking for a library.

Michele13 · 05-13-2018, 04:43 PM

Quote:

Originally Posted by AwesomeMachine

which command gives you the error in the first post?

Code:

./gcc ~/hello.c -o ~/tmp/hello.arm