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Bug 4988

Summary: Mac: VIDEO_METAL/VIDEO_VULKAN options cannot be enabled using CMake
Product: SDL Reporter: kvryonides
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: icculus, lassi
Version: don't knowKeywords: target-2.0.14
Hardware: x86_64   
OS: macOS 10.15   

Description kvryonides 2020-02-16 13:31:54 UTC 
I am trying to build the latest source from the default branch and I am using MacOS Catalina version 10.15.3 (19D76).

Compiling SDL2 using CMake and setting options VIDEO_METAL/VIDEO_VULKAN to ON fails to enable them. Building SDL2 2.0.10 from source works correctly and Metal/Vulkan support is enabled.

The relevant output I get from CMake is the following:
-- Performing Test HAVE_FRAMEWORK_METAL
-- Performing Test HAVE_FRAMEWORK_METAL - Failed

--   VIDEO_METAL            (Wanted: 0): OFF
--   VIDEO_VULKAN           (Wanted: 0): OFF

When using /.configure, I think it works correctly although I have not tried to build and link against it because I can see it print the following at the end:

Video drivers   : dummy cocoa metal opengl opengl_es2 vulkan

I believe I have tracked the issue to potentially this line and commit: https://hg.libsdl.org/SDL/rev/b87ba0fad17e#l1.44

My assumption is that check_c_source_compiles() fails to compile the provided  input because it is an objective-c source (for example using #import)and not a c source.
Comment 1 Ryan C. Gordon 2020-06-27 06:03:39 UTC 
This is fixed in https://hg.libsdl.org/SDL/rev/e7828d3a7576

--ryan.
Comment 2 lassi 2020-09-15 02:04:44 UTC 
*** Bug 5204 has been marked as a duplicate of this bug. ***