build failed (link error) because C object file (stdlib_system_subprocess.c.o) is architecture x86_64 and not arm64

[sto3014]

Description

• in shell change to stdlib repository
• cmake -B build -G Ninja
• cmake --build build

error:
Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: archive member: src/libfortran_stdlib.a(stdlib_system_subprocess.c.o) cputype (16777223) does not match previous archive members cputype (16777228) (all members must match).

with -DCMAKE_VERBOSE_MAKEFILE=on one can see that the compile flag -arch is set to x86_64:

• /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -DSTDLIB_EXTERNAL_BLAS -DSTDLIB_EXTERNAL_LAPACK -I"/Users/dieterstockhausen/Library/Mobile Documents/comappleCloudDocs/Projekte/ThirdParty/Fortran/stdlib/build/src/mod_files" -O2 -g -DNDEBUG -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.5.sdk -fPIC -MD -MT src/CMakeFiles/fortran_stdlib.dir/stdlib_system_subprocess.c.o -MF src/CMakeFiles/fortran_stdlib.dir/stdlib_system_subprocess.c.o.d -o src/CMakeFiles/fortran_stdlib.dir/stdlib_system_subprocess.c.o -c '/Users/dieterstockhausen/Library/Mobile Documents/comappleCloudDocs/Projekte/ThirdParty/Fortran/stdlib/src/stdlib_system_subprocess.c'

If I take this command and change -arch to arm64 and compile stdlib_system_subprocess.c the linker is able to link libfortran_stdlib.a (I used the link command from the previous CMAKE logging).

This issue does not occur on Ubuntu 24.04.2 LTS (arm64).

Expected Behaviour

Do we need a fix, or is there a workaround for setting the architecture to arm64?

Version of stdlib

latest

Platform and Architecture

MacOS/ARM

Additional Information

No response