Centos 7 build linked with glibc 2.27 instead of 2.17

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..

Start with the CentOS toolchain used by the CMake compiler check at CMakeLists.txt:96, then inspect how its ld executable is built and which glibc version it requires. Reproduce the failing CMake test and verify that the toolchain can link a simple C program using the CentOS 7 glibc 2.17 environment.