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Bug 5204

Summary: Metal support is not detected properly by CMake on macOS
Product: SDL Reporter: lassi
Component: buildAssignee: Sam Lantinga <slouken>
Status: RESOLVED DUPLICATE QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.1   
Hardware: All   
OS: macOS 10.15   

Description lassi 2020-06-20 13:53:59 UTC 
Hello all,

After recent updates on my MBP my setup to build my project with MoltenVK suddenly stopped working. Long story short, it turns out, for some reason HAVE_FRAMEWORK_METAL was not working.

When building with cmake, logs are plagued with:

CMakeFiles/cmTC_5407b.dir/src.c.o:1:1: error: source file is not valid UTF-8
… (2000 lines later)
CMakeFiles/cmTC_5407b.dir/src.c.o:2:934: warning: null character ignored [-Wnull-character] ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
702 warnings and 20 errors generated.
make[1]: *** [cmTC_5407b] Error 1
make: *** [cmTC_5407b/fast] Error 2

Every single character in those files seems to be somehow wrong. I tried to get this string into vscode and check encoding and line endings but it does not work. However, when I changed flags for this from -x objective-c => -ObjC it works fine. I do not code objective-c so I have no idea why this is more correct.

My environment version is:
AppleClang 11.0.3.11030032 (latest Xcode)
macOS 10.15.4
cmake version 3.17.1

I previously sent this bug report here:
https://discourse.libsdl.org/t/macos-build-issues-not-detecting-metal/27557
Comment 1 lassi 2020-09-15 02:04:44 UTC 
duplicate of #4988 and fixed

*** This bug has been marked as a duplicate of bug 4988 ***