IAR: Regression in 3.21.0, unable to compile project

I have a project which uses the IAR compiler, using a toolchain file.

With CMake version 3.20.5, this compiles without problems. After updating to CMake 3.21, it fails with the following error:

-- Check for working C compiler: C:/Program Files/IAR Systems/Embedded Workbench 9.0/arm/bin/iccarm.exe - broken
CMake Error at C:/Users/BDOMI/scoop/apps/cmake/3.21.0/share/cmake-3.21/Modules/CMakeTestCCompiler.cmake:66 (message):
  The C compiler

    "C:/Program Files/IAR Systems/Embedded Workbench 9.0/arm/bin/iccarm.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: C:/DIST/dev/topas_core_2/build/topas_rel/CMakeFiles/CMakeTmp

    Run Build Command(s):C:\qp\qtools\bin\make.exe -f Makefile cmTC_d8493/fast && C:/qp/qtools/bin/make  -f CMakeFiles\cmTC_d8493.dir\build.make CMakeFiles/cmTC_d8493.dir/build
    make[1]: Entering directory 'C:/DIST/dev/topas_core_2/build/topas_rel/CMakeFiles/CMakeTmp'
    Building C object CMakeFiles/cmTC_d8493.dir/testCCompiler.c.o
    C:\PROGRA~1\IARSYS~1\EMBEDD~1.0\arm\bin\iccarm.exe  --silent C:\DIST\dev\topas_core_2\build\topas_rel\CMakeFiles\CMakeTmp\testCCompiler.c  -IC:\PROGRA~1\IARSYS~1\EMBEDD~1.0\arm\inc\c --cpu Cortex-M4 --fpu VFPv4_sp --vectorize --no_wrap_diagnostics --mfc  -e -o CMakeFiles\cmTC_d8493.dir\testCCompiler.c.o
    Linking C executable cmTC_d8493.elf
    C:\Users\BDOMI\scoop\apps\cmake\3.21.0\bin\cmake.exe -E cmake_link_script CMakeFiles\cmTC_d8493.dir\link.txt --verbose=1
    C:\qp\qtools\mingw32\bin\ld.exe --silent CMakeFiles/cmTC_d8493.dir/testCCompiler.c.o --inline --merge_duplicate_sections  -o cmTC_d8493.elf
    C:\qp\qtools\mingw32\bin\ld.exe: unrecognized option '--silent'
    C:\qp\qtools\mingw32\bin\ld.exe: use the --help option for usage information

The problem seems to be that the wrong linker is used.

The correct linker for IAR would be C:/Program Files/IAR Systems/Embedded Workbench 9.0/arm/bin/ilinkarm.exe, which is also found in the CMakeCache.txt file. However, the error message shows that CMake tries to use the C:\qp\qtools\mingw32\bin\ld.exe linker, which is not correct.

Are there any changes in the toolchain file necessary when updating to version 3.21?

CMakeOutput.log CMakeError.log