I'm trying to build an older version of GCC toolchain for ARM under x86 because there is a bug with GCC > v5 for Cortex-M0. I'm following the combination of the following instructions:

So my overall procedure is as follows:

# Download GCC-5.5.0 from https://gcc.gnu.org/releases.html
tar xzf gcc-$VERSION.tar.gz
cd gcc-$VERSION
cd ..
mkdir objdir
cd objdir
../gcc-5.5.0/configure --prefix=$HOME/embedded/gcc-arm-none-eabi-5.5.0 --disable-multilib --enable-languages=c,c++ --target=arm-none-eabi
make -j$(nproc) # use all cores
make install

Then the following files are created under ~/embedded/arm-none-eabi-5.5.0/bin/:

arm-none-eabi-c++  arm-none-eabi-gcc-5.5.0   arm-none-eabi-gcov
arm-none-eabi-cpp  arm-none-eabi-gcc-ar      arm-none-eabi-gcov-dump
arm-none-eabi-g++  arm-none-eabi-gcc-nm      arm-none-eabi-gcov-tool
arm-none-eabi-gcc  arm-none-eabi-gcc-ranlib

However, the following command fails:

arm-none-eabi-gcc -c -mcpu=cortex-m0 -O0 -ggdb (......)

Compiling crt0_v6m.S
as: unrecognized option '-mcpu=cortex-m0'
make: *** [/home/ceremcem/ChibiOS/os/common/startup/ARMCMx/compilers/GCC/rules.mk:253: build/obj/crt0_v6m.o] Error 1

I can verify that the command uses newly produced binaries:

$ which arm-none-eabi-gcc

This means that the newly compiled GCC toolchain does not accept the mcpu option. What could be wrong with building the GCC toolchain phase that causes -mcpu=cortex-m0 option to fail?

  • Have you installed the appropriate cross-binutils? It’s as that’s complaining, and that’s part of binutils. – Stephen Kitt Apr 7 at 16:47
  • Yes and no. I'm already installed and using arm-none-eabi-gcc v7.3.1 so I assumed the rest of the dependencies are already satisfied by the v7.3.1 installation and ./contrib/download_prerequisites command. Should I build something else? – ceremcem Apr 7 at 16:52
  • What version of Debian are you using? – Stephen Kitt Apr 7 at 20:33
  • I'm using Debian Buster/sid (testing). I would like to achieve a distro agnostic solution though. – ceremcem Apr 7 at 20:37
  • Right, I understand that, I was wondering since Debian 9 has gcc-arm-none-eabi version 5.4.1. – Stephen Kitt Apr 7 at 20:39

Your GCC doesn’t appear to be using the right as, and probably wouldn’t use the right ld either; you need to add

--with-as=/usr/bin/arm-none-eabi-as --with-ld=/usr/bin/arm-none-eabi-ld

to your ./configure line.

You’re also likely to run into issues related to Debian’s multi-arch approach, which GCC 5 doesn’t support directly. Your best bet is to download the last Debian package of GCC 5.5 in source form, and use that (with patches) to build your cross-compiler. Then it will use the ARM C library which was installed as a dependency of the cross-GCC package you installed.

dget https://snapshot.debian.org/archive/debian-debug/20180412T094604Z/pool/main/g/gcc-5/gcc-5_5.5.0-12.dsc
cd gcc-5-5.5.0
debian/rules patch

then configure and build as before. (Ignore the cross-building documentation in debian/README.cross.)

  • This didn't solve all issues but made the problem proceed to another step: Now it can't find stdint.h while compiling an application, very much like the problem I've faced 4 years ago: stackoverflow.com/q/23973971/1952991 – ceremcem Apr 7 at 17:49
  • That’s because it’s looking for headers in the upstream location, not in the multiarch location; see my updated answer for a fix. – Stephen Kitt Apr 7 at 19:14
  • No luck, very same issue persists. Note that the /usr/lib/gcc/arm-none-eabi/7.3.1/include/ folder contains many *.h files but the include folder in newly compiled gcc installation location is still empty. – ceremcem Apr 7 at 20:26

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