Use custom gcc version for dockcross/linux-arm64-full

[Pibmy]

Hello,

I'm trying to compile an application with the dockcross/linux-arm64-full for a raspberry-pi4. But compiling with the default configuration it uses gcc 11.2.0 version of the compiler and when I run the compiled code in the raspberry I get the message:

• /lib/aarch64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found
• /lib/aarch64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.29'

The ldd version on raspberry is:

ubuntu@ubuntu:~$ ldd --version
ldd (Ubuntu GLIBC 2.31-0ubuntu9.2) 2.31

The os-release is:

ubuntu@ubuntu:~$ cat /etc/os-release 
NAME="Ubuntu"
VERSION="20.04.3 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.3 LTS"
VERSION_ID="20.04"

Is it possible to get dockcross/linux-arm64-full with gcc 9.3 ?
I tried to recompile the image modifying the BR2_GCC_VERSION parameter of buildroot.config file but it fails :(

An other solution would be to use the dockcross/linux-arm64-lts image but i need the qt5-core qt5-network dependencies and i failed to compile them for the image.

Thank for your help.

[bensuperpc]

I'm thinking maybe downgrading the GLIBC version, unfortunately it is not possible to change some GLIBC options (Like version...) with buildroot, it is possible crosstool-ng, I'll look into it when I have time.

I can advise you to use buildroot (Vers. Buildroot 2021.08) rather than modifying directly in the configuration file, but otherwise:

There are several other lines to change to go back to GCC 9.3:

dockcross/linux-arm64-full/buildroot.config

Lines 247 to 262 in 6dd95fc

	#
	# GCC Options
	#
	# BR2_GCC_VERSION_9_X is not set
	# BR2_GCC_VERSION_10_X is not set
	BR2_GCC_VERSION_11_X=y
	BR2_GCC_SUPPORTS_DLANG=y
	BR2_GCC_VERSION="11.2.0"
	BR2_EXTRA_GCC_CONFIG_OPTIONS=""
	BR2_TOOLCHAIN_BUILDROOT_CXX=y
	BR2_TOOLCHAIN_BUILDROOT_FORTRAN=y
	# BR2_TOOLCHAIN_BUILDROOT_DLANG is not set
	BR2_GCC_ENABLE_LTO=y
	BR2_GCC_ENABLE_OPENMP=y
	BR2_GCC_ENABLE_GRAPHITE=y
	BR2_PACKAGE_HOST_GDB_ARCH_SUPPORTS=y

dockcross/linux-arm64-full/buildroot.config

Lines 363 to 366 in 6dd95fc

	BR2_TOOLCHAIN_GCC_AT_LEAST_9=y
	BR2_TOOLCHAIN_GCC_AT_LEAST_10=y
	BR2_TOOLCHAIN_GCC_AT_LEAST_11=y
	BR2_TOOLCHAIN_GCC_AT_LEAST="11"

There may be other lines to change and possible compatibility issues with other software in buildroot, going through buildroot GUI is easier to configure the toolchain.

I hope this will help you,

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[saxbophone]

As an aside, it would be helpful for the versions of C/C++ compilers that are shipped with the images to be documented.

My use case: I'm using C++20 and the exact features of this new dialect of the language that are available depends on the compiler version.

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[saxbophone]

This issue is still valid

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This issue is stale because it has been open 120 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[saxbophone]

This issue is still valid

[baiwfg2]

As an aside, it would be helpful for the versions of C/C++ compilers that are shipped with the images to be documented.

My use case: I'm using C++20 and the exact features of this new dialect of the language that are available depends on the compiler version.

Yes, I agree. If the version of gcc is tagged into image name, we can identify which image is suitable for download.

[baiwfg2]

My raspbian gcc version is :

pi@raspberrypi:~ $ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.9/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Raspbian 4.9.2-10' --with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.9 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-armhf --with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
Thread model: posix
gcc version 4.9.2 (Raspbian 4.9.2-10)
pi@raspberrypi:~ $ strings /lib/arm-linux-gnueabihf/libc.so.6 | grep GLIBC_
GLIBC_2.4
GLIBC_2.5
GLIBC_2.6
GLIBC_2.7
GLIBC_2.8
GLIBC_2.9
GLIBC_2.10
GLIBC_2.11
GLIBC_2.12
GLIBC_2.13
GLIBC_2.14
GLIBC_2.15
GLIBC_2.16
GLIBC_2.17
GLIBC_2.18
GLIBC_PRIVATE

Apprently the latest image of dockcross/linux-armv6 cannot generate binary whose GLIBC version is lower than GLIBC_2.18

[baiwfg2]

Finally I found dockcross/linux-armv6:20200324-880bfd0 which contains gcc 4.8 rather than 11.3 in newest images. I think you can also find your gcc version from https://hub.docker.com/r/dockcross/linux-arm64-full/tags @Pibmy

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