Centos 7 build linked with glibc 2.27 instead of 2.17

[samuel-cc-4451]

First of all, thanks for supporting centos 7..

Encountered this error while trying to use the centos toolchain.

-- The C compiler identification is GNU 15.2.0
-- The CXX compiler identification is GNU 15.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: /home/myhome/x-tools/x86_64-centos7-linux-gnu/bin/x86_64-centos7-linux-gnu-gcc
-- Check for working C compiler: /home/myhome/x-tools/x86_64-centos7-linux-gnu/bin/x86_64-centos7-linux-gnu-gcc - broken
CMake Error at /home/myhome/cmake/share/cmake-3.25/Modules/CMakeTestCCompiler.cmake:70 (message):
  The C compiler
    "/home/myhome/x-tools/x86_64-centos7-linux-gnu/bin/x86_64-centos7-linux-gnu-gcc"
  is not able to compile a simple test program.
  It fails with the following output:
    Change Dir: /builds/cbuild/CMakeFiles/CMakeScratch/TryCompile-s5dgPf
    
    Run Build Command(s):/bin/gmake -f Makefile cmTC_e95f0/fast && /bin/gmake  -f CMakeFiles/cmTC_e95f0.dir/build.make CMakeFiles/cmTC_e95f0.dir/build
    gmake[1]: Entering directory `/builds/cbuild/CMakeFiles/CMakeScratch/TryCompile-s5dgPf'
    Building C object CMakeFiles/cmTC_e95f0.dir/testCCompiler.c.o
    /home/myhome/x-tools/x86_64-centos7-linux-gnu/bin/x86_64-centos7-linux-gnu-gcc   -fPIE -std=gnu99 -o CMakeFiles/cmTC_e95f0.dir/testCCompiler.c.o -c /builds/cbuild/CMakeFiles/CMakeScratch/TryCompile-s5dgPf/testCCompiler.c
    Linking C executable cmTC_e95f0
    /home/myhome/cmake/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e95f0.dir/link.txt --verbose=1
    /home/myhome/x-tools/x86_64-centos7-linux-gnu/bin/x86_64-centos7-linux-gnu-gcc CMakeFiles/cmTC_e95f0.dir/testCCompiler.c.o -o cmTC_e95f0  -Wl,-rpath,/home/myhome/x-tools/x86_64-centos7-linux-gnu/x86_64-centos7-linux-gnu/lib64 
    /home/myhome/x-tools/x86_64-centos7-linux-gnu/bin/../lib/gcc/x86_64-centos7-linux-gnu/15.2.0/../../../../x86_64-centos7-linux-gnu/bin/ld: /lib64/libc.so.6: version `GLIBC_2.27' not found (required by /home/myhome/x-tools/x86_64-centos7-linux-gnu/bin/../lib/gcc/x86_64-centos7-linux-gnu/15.2.0/../../../../x86_64-centos7-linux-gnu/bin/ld)
    collect2: error: ld returned 1 exit status
    gmake[1]: *** [cmTC_e95f0] Error 1
    gmake[1]: Leaving directory `/builds/cbuild/CMakeFiles/CMakeScratch/TryCompile-s5dgPf'
    gmake: *** [cmTC_e95f0/fast] Error 2
    
    
  
  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:96 (project)

The issue apparantly is with ld build with glibc 2.27 instead of 2.17 (the centos 7) version..

[tttapa]

The toolchains themselves require newer versions of glibc to run. They target CentOS 7 (i.e., the binaries produced by the toolchain can run on CentOS), but running the compilers etc. on CentOS is not supported.

The idea here is that as a developer, you have a build machine that's relatively up-to-date (glibc 2.27 or later), and you want to build your software on that machine, in a way that the resulting binaries are compatible with older systems (glibc 2.17 or later).

[samuel-cc-4451]

Got it.. thanks 👍

[tttapa]

If you need the toolchains themselves to run on CentOS 7, you have two main options:

• Either build the toolchains in a CentOS 7 Docker container by modifying this project's Dockerfile (you can look at older versions of this repo, which used to do this, see also CentOS 7 binaries don't work #3);
• or use the toolchains in this repository (build=bionic,host=bionic,target=centos7) to cross-compile another toolchain for CentOS 7 (build=bionic,host=centos7,target=centos7). Crosstool-NG calls this a "Canadian cross" build. (This is what I used here: https://github.com/tttapa/docker-arm-cross-toolchain/blob/7637368f54f682dde6d515e3f924e9b92230d037/Dockerfile#L77-L99)

[samuel-cc-4451]

I think targeting centos 7 is good enough for me..

Will try this out in case it doesn't work out..

Thanks a lot 👍

[taolinke]

Since gcc-15 toolchain not work on centos 7, Is there any version of toolchains works on centos 7?

[taolinke]

Since gcc-15 toolchain not work on centos 7, Is there any version of toolchains works on centos 7?

I found it. #3 (comment). Thanks.

[tttapa]

@taolinke I'm curious, what makes you choose CentOS 7 for development in 2026?