Cannot build MentOS on macOS M2

[anta40]

The doc says to build MentOS on macOS, these packages are needed:

• i386-elf-binutils
• i386-elf-gcc

I already did, and can built xv6. But when building MentOS, running make fails because it invokes Apple's compiler, not i386-elf-gcc

[  1%] Building C object libc/CMakeFiles/libc.dir/src/err.c.o
cc: error: unsupported argument 'i686' to option '-march='
make[2]: *** [libc/CMakeFiles/libc.dir/src/err.c.o] Error 1
make[1]: *** [libc/CMakeFiles/libc.dir/all] Error 2
make: *** [all] Error 2

OK, how to modify the CMake config/Makefile/etc so it's i386-elf-gcc which is should be called instead?

[anta40]

My cmake knowledge is very rusty. Apologies.
I tried this:

$ cmake .. -D CMAKE_C_COMPILER=i386-elf-gcc
-- The C compiler identification is GNU 14.1.0
-- The ASM compiler identification is GNU
-- Found assembler: /opt/homebrew/bin/i386-elf-gcc
-- Checking whether C compiler has -isysroot
-- Checking whether C compiler has -isysroot - yes
-- Checking whether C compiler supports OSX deployment target flag
-- Checking whether C compiler supports OSX deployment target flag - no
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: /opt/homebrew/bin/i386-elf-gcc
-- Check for working C compiler: /opt/homebrew/bin/i386-elf-gcc - broken
CMake Error at /opt/homebrew/share/cmake/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "/opt/homebrew/bin/i386-elf-gcc"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: '/Users/andretampubolon/Lab/OSDev/MentOS/mentos-git/build/CMakeFiles/CMakeScratch/TryCompile-T1F4hq'

    Run Build Command(s): /opt/homebrew/bin/cmake -E env VERBOSE=1 /opt/homebrew/bin/gmake -f Makefile cmTC_4e7c6/fast
    /opt/homebrew/bin/gmake  -f CMakeFiles/cmTC_4e7c6.dir/build.make CMakeFiles/cmTC_4e7c6.dir/build
    gmake[1]: Entering directory '/Users/andretampubolon/Lab/OSDev/MentOS/mentos-git/build/CMakeFiles/CMakeScratch/TryCompile-T1F4hq'
    Building C object CMakeFiles/cmTC_4e7c6.dir/testCCompiler.c.o
    /opt/homebrew/bin/i386-elf-gcc   -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk -o CMakeFiles/cmTC_4e7c6.dir/testCCompiler.c.o -c /Users/andretampubolon/Lab/OSDev/MentOS/mentos-git/build/CMakeFiles/CMakeScratch/TryCompile-T1F4hq/testCCompiler.c
    i386-elf-gcc: error: unrecognized command-line option '-arch'
    gmake[1]: *** [CMakeFiles/cmTC_4e7c6.dir/build.make:81: CMakeFiles/cmTC_4e7c6.dir/testCCompiler.c.o] Error 1
    gmake[1]: Leaving directory '/Users/andretampubolon/Lab/OSDev/MentOS/mentos-git/build/CMakeFiles/CMakeScratch/TryCompile-T1F4hq'
    gmake: *** [Makefile:134: cmTC_4e7c6/fast] Error 2





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:9 (project)


-- Configuring incomplete, errors occurred!