MacOS github action currently fails

[glikely]

Operating System Info

macOS 15

Other OS

No response

OBS Studio Version

31.0.3

OBS Studio Version (Other)

No response

OBS Studio Log URL

n/a

OBS Studio Crash Log URL

n/a

Expected Behavior

The MacOS github action fails to build on a pristine clone of obs-plugintemplate. Here's a link to the build result showing the failure. It appears that detection of the MacOS SDK version is failing.

https://github.com/glikely/obs-plugintemplate/actions/runs/14550478987

Current Behavior

The build currently fails with the follow log output

  -- The C compiler identification is AppleClang 16.0.0.16000026
  -- The CXX compiler identification is AppleClang 16.0.0.16000026
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Check for working C compiler: /Applications/Xcode_16.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang - skipped
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- Detecting CXX compiler ABI info
  -- Detecting CXX compiler ABI info - done
  -- Check for working CXX compiler: /Applications/Xcode_16.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ - skipped
  -- Detecting CXX compile features
  -- Detecting CXX compile features - done
  CMake Error at cmake/macos/compilerconfig.cmake:21 (string):
  -- Configuring incomplete, errors occurred!
    string sub-command REGEX, mode MATCH needs at least 5 arguments total to
    command.
  Call Stack (most recent call first):
    CMakeLists.txt:10 (include)
  
  
  CMake Error at cmake/macos/compilerconfig.cmake:25 (message):
  
    Your macOS SDK version () is too low.  The macOS 15.0 SDK (Xcode 16.0) is
    required to build OBS.
    Callstack:
    .github/scripts/build-macos:114
  Call Stack (most recent call first):
    CMakeLists.txt:10 (include)
  
  
  Error:     ✖︎ script execution error
       .github/scripts/build-macos:153
    
  Error: Process completed with exit code 2.`

This is based on current tip of tree for the plugin template:

013ffca

Steps to Reproduce

Create a github repo and put the current tip-of-tree from obs-plugintemplate to the repo

Anything else we should know?

No response

[Trouffman]

This is related to a change in cmake 4 that does not detect the MACOS sdk as previously.

This is also linked to #145

[glikely]

I suspected as much. However, the linked patch doesn't solve the problem for me. It still doesn't find the SDK and the build fails

[glikely]

And unfortunately, there isn't an easy way to work around it by downgrading to cmake 3 because homebrew only packages the latest release. Lots of projects seem to be impacted by the breaking changes

[glikely]

I've been able to fix the xcode version detection with a simpler fix than the pull request, but the build still fails when building obs-studio with a similar error. I've not yet found a solution without modifying the obs-studio source directly.

Here's the change I've made to complierconfig.cmake:

diff --git a/cmake/macos/compilerconfig.cmake b/cmake/macos/compilerconfig.cmake
index 603078d..c743ee4 100644
--- a/cmake/macos/compilerconfig.cmake
+++ b/cmake/macos/compilerconfig.cmake
@@ -17,9 +17,11 @@ add_compile_options("$<$<NOT:$<COMPILE_LANGUAGE:Swift>>:-fopenmp-simd>")
 # Ensure recent enough Xcode and platform SDK
 set(_obs_macos_minimum_sdk 15.0) # Keep in sync with Xcode
 set(_obs_macos_minimum_xcode 16.0) # Keep in sync with SDK
-message(DEBUG "macOS SDK Path: ${CMAKE_OSX_SYSROOT}")
-string(REGEX MATCH ".+/MacOSX.platform/Developer/SDKs/MacOSX([0-9]+\\.[0-9])+\\.sdk$" _ ${CMAKE_OSX_SYSROOT})
-set(_obs_macos_current_sdk ${CMAKE_MATCH_1})
+execute_process(
+  COMMAND xcrun --sdk macosx --show-sdk-version
+  OUTPUT_VARIABLE _obs_macos_current_sdk
+  WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+  OUTPUT_STRIP_TRAILING_WHITESPACE)
 message(DEBUG "macOS SDK version: ${_obs_macos_current_sdk}")
 if(_obs_macos_current_sdk VERSION_LESS _obs_macos_minimum_sdk)
   message(

The odd thing is that the obs-studio build runs fine on my local mac, but won't build in the github action. I'm still trying to track down the difference.

[Trouffman]

Correct. this impact in 2 locations

• A. at the plugin level
• B. at the obs deps build level

White fixing the code in the plugin fix point A.

It will still fail at point B because the action are leveraging the obs-deps that are pre-ready and in the repo "obs-deps".

The version in obs-deps did not had the fix for that issue.

Locally there is a manual fix possible (fix the code as suggested on the temporary obs-deps folder)

For the GitHub action I suspect this will need a new obs-deps build with that fox...

[glikely]

Hmmm... I'm seeing something different. obs-deps is installing fine. It is the obs-studio source tree that I'm having problems with. I've got a fix I've settled on now. Given that there isn't yet an obs-studio tag contining the cmake fix, I've forked the repo, cherry picked the relevant commits from the master branch, and switched my plugin to use that branch.

Here's the passing build:
https://github.com/glikely/obs-plugintemplate/actions/runs/14618253470 (fixed)

The commit for switching to the fixed fork of obs-studio:
glikely@4d33ba3 (fixed)

And here is the commit for the change I described above:
glikely@cd82b82

[glikely]

I've sent a PR to the obs-studio project to backport the build system fix into the 31.0.x release branch

[Trouffman]

You can already fix this by applying the changes from #149

[glikely]

Add a "Fixes" tag to your commit and it will automatically close this issue when it is merged. :-)