Fix build.sh to use Homebrew Clang on mac by PLAZMAMA · Pull Request #527 · PufferAI/PufferLib

PLAZMAMA · 2026-04-13T03:07:57Z

Original issue

Commit ab75881 addresses the -lomp5 compilation error on mac, however this doesn't fix the root cause.

Root Cause

The root cause is that mac's non-standard clang(Apple Clang) links differently than normal clang. For example, the -fopenmp flag isn't supported in apple clang so it creates a compilation error even after the "-lomp5 fix".

This means that this issue will happen with other libs in the future and will have to be fixed and maintained constantly.

The Fix

This PR addresses the original issue and root cause by forcing the user to use "real" clang in a clear way which makes compilation identical on Linux and Mac.

Additional Notes

Installing real clang on mac is really easy, its just brew install llvm. So this shouldn't make mac user's life that much harder.
Additionally, its worth noting that I became aware of the -lomp5 and -fopenmp issues from this PR PufferLib 4.0 macOS installation fixes #507 first

Working Build Commands on Mac

./build.sh breakout --local
./build.sh breakout --cpu

wasaysir · 2026-05-09T00:56:09Z

I wasn't able to get this working out of the box. I tried running ./build.sh breakout --local and ./build.sh breakout --cpu and neither worked out of the box, pointing to issues with clang.

Before trying his fix, I ran brew install llvm. Here's the results of trying each command:
./build.sh breakout --local:

Compiling breakout...
./build.sh: line 154: /usr/local/opt/llvm/bin/clang: No such file or directory

./build.sh breakout --cpu:

Compiling static library for breakout...
./build.sh: line 225: /usr/local/opt/llvm/bin/clang: No such file or directory

I'm running on an M2 Macbook Air.

Here's the result of my clang --version:

Homebrew clang version 22.1.4
Target: arm64-apple-darwin24.6.0
Thread model: posix
InstalledDir: /opt/homebrew/Cellar/llvm/22.1.4/bin
Configuration file: /opt/homebrew/Cellar/llvm/22.1.4/etc/clang/arm64-apple-darwin24.cfg

Should it work out of the box, or do I have a misconfiguration before I can get this working?

PLAZMAMA · 2026-05-09T01:01:41Z

yes, it should technically work out of the box.
Can you try running brew --prefix llvm and let show me the output?
Btw, great comment reply!
You went into more detail than 90% of error reports I see on this site.

wasaysir · 2026-05-09T05:08:07Z

Here's the result for brew --prefix llvm:

/opt/homebrew/opt/llvm

Also I opened a new terminal session and I think things are looking better now. I'm not sure what I might have screwed up in the previous session, but running ./build.sh breakout --cpu I get this:

./build.sh breakout --cpu
Compiling static library for breakout...
clang: warning: argument unused during compilation: '-fno-semantic-interposition' [-Wunused-command-line-argument]
Compiling CPU training backend...
Built: pufferlib/_C.cpython-312-darwin.so

However when running ./build.sh breakout --local I get the following:

`./build.sh breakout --local` output

Compiling breakout...
ld: warning: can't parse dwarf compilation unit info in /var/folders/pt/5rc8_4vx4fxgfsq0kq0cq63h0000gn/T/breakout-3c3a0b.o
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      -[GLFWContentView scrollWheel:] in libraylib.a(rglfw.o)
  "_objc_msgSend$sendEvent:", referenced from:
      __glfwDestroyWindowCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
      __glfwPollEventsCocoa in libraylib.a(rglfw.o)
      __glfwWaitEventsCocoa in libraylib.a(rglfw.o)
      __glfwWaitEventsTimeoutCocoa in libraylib.a(rglfw.o)
      ____glfwInitCocoa_block_invoke in libraylib.a(rglfw.o)
  "_objc_msgSend$separatorItem", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$set", referenced from:
      __glfwSetCursorPosCocoa in libraylib.a(rglfw.o)
      __glfwSetCursorCocoa in libraylib.a(rglfw.o)
      _updateCursorMode in libraylib.a(rglfw.o)
      -[GLFWContentView cursorUpdate:] in libraylib.a(rglfw.o)
  "_objc_msgSend$setAcceptsMouseMovedEvents:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setActivationPolicy:", referenced from:
      __glfwInitCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setAlphaValue:", referenced from:
      __glfwSetWindowOpacityCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setBackgroundColor:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setCollectionBehavior:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowResizableCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setContentAspectRatio:", referenced from:
      __glfwSetWindowAspectRatioCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setContentMaxSize:", referenced from:
      __glfwSetWindowSizeLimitsCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setContentMinSize:", referenced from:
      __glfwSetWindowSizeLimitsCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setContentView:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setContentsScale:", referenced from:
      __glfwCreateWindowSurfaceCocoa in libraylib.a(rglfw.o)
      -[GLFWContentView viewDidChangeBackingProperties] in libraylib.a(rglfw.o)
  "_objc_msgSend$setDelegate:", referenced from:
      __glfwInitCocoa in libraylib.a(rglfw.o)
      __glfwTerminateCocoa in libraylib.a(rglfw.o)
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwDestroyWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setFrame:display:", referenced from:
      __glfwSetWindowSizeCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
      _acquireMonitorCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setFrameAutosaveName:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setFrameOrigin:", referenced from:
      __glfwSetWindowPosCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setHasShadow:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setIgnoresMouseEvents:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMousePassthroughCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setKeyEquivalentModifierMask:", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$setLayer:", referenced from:
      __glfwCreateWindowSurfaceCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setLevel:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowFloatingCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setMainMenu:", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$setMiniwindowTitle:", referenced from:
      __glfwSetWindowTitleCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setOpaque:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setResizeIncrements:", referenced from:
      __glfwSetWindowAspectRatioCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setRestorable:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setServicesMenu:", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$setString:", referenced from:
      -[GLFWContentView unmarkText] in libraylib.a(rglfw.o)
  "_objc_msgSend$setString:forType:", referenced from:
      __glfwSetClipboardStringCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setStyleMask:", referenced from:
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowResizableCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowDecoratedCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setSubmenu:", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$setTabbingMode:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setTitle:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowTitleCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setValues:forParameter:", referenced from:
      __glfwCreateContextNSGL in libraylib.a(rglfw.o)
      _swapIntervalNSGL in libraylib.a(rglfw.o)
  "_objc_msgSend$setView:", referenced from:
      __glfwCreateContextNSGL in libraylib.a(rglfw.o)
  "_objc_msgSend$setWantsBestResolutionOpenGLSurface:", referenced from:
      __glfwCreateContextNSGL in libraylib.a(rglfw.o)
  "_objc_msgSend$setWantsLayer:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwCreateWindowSurfaceCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$setWindowsMenu:", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$sharedApplication", referenced from:
      __glfwInitCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$standardUserDefaults", referenced from:
      __glfwInitCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$stop:", referenced from:
      -[GLFWApplicationDelegate applicationDidFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$string", referenced from:
      -[GLFWContentView insertText:replacementRange:] in libraylib.a(rglfw.o)
  "_objc_msgSend$stringForType:", referenced from:
      __glfwGetClipboardStringCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$stringWithFormat:", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
  "_objc_msgSend$stringWithUTF8String:", referenced from:
      -[GLFWApplicationDelegate applicationWillFinishLaunching:] in libraylib.a(rglfw.o)
      __glfwSetClipboardStringCocoa in libraylib.a(rglfw.o)
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowTitleCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$styleMask", referenced from:
      __glfwSetWindowMonitorCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowResizableCocoa in libraylib.a(rglfw.o)
      __glfwSetWindowDecoratedCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$types", referenced from:
      __glfwGetClipboardStringCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$unhide", referenced from:
      __glfwSetCursorPosCocoa in libraylib.a(rglfw.o)
      __glfwSetCursorCocoa in libraylib.a(rglfw.o)
      _updateCursorMode in libraylib.a(rglfw.o)
      -[GLFWContentView cursorUpdate:] in libraylib.a(rglfw.o)
      -[GLFWContentView mouseExited:] in libraylib.a(rglfw.o)
  "_objc_msgSend$unsignedIntValue", referenced from:
      __glfwPollMonitorsCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$update", referenced from:
      -[GLFWApplicationDelegate applicationDidChangeScreenParameters:] in libraylib.a(rglfw.o)
      -[GLFWWindowDelegate windowDidResize:] in libraylib.a(rglfw.o)
      -[GLFWWindowDelegate windowDidMove:] in libraylib.a(rglfw.o)
      -[GLFWContentView updateLayer] in libraylib.a(rglfw.o)
  "_objc_msgSend$updateTrackingAreas", referenced from:
      -[GLFWContentView initWithGlfwWindow:] in libraylib.a(rglfw.o)
  "_objc_msgSend$valueForKey:", referenced from:
      __glfwPollMonitorsCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$visibleFrame", referenced from:
      __glfwGetMonitorWorkareaCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$windowNumber", referenced from:
      __glfwWindowHoveredCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$windowNumberAtPoint:belowWindowWithWindowNumber:", referenced from:
      __glfwWindowHoveredCocoa in libraylib.a(rglfw.o)
  "_objc_msgSend$zoom:", referenced from:
      __glfwCreateWindowCocoa in libraylib.a(rglfw.o)
      __glfwRestoreWindowCocoa in libraylib.a(rglfw.o)
      __glfwMaximizeWindowCocoa in libraylib.a(rglfw.o)
ld: symbol(s) not found for architecture arm64

wasaysir · 2026-05-09T05:35:26Z

After running the command as bash -x build.sh breakout --local I was able to retrieve the exact command used:

/opt/homebrew/opt/llvm/bin/clang -g -O0 -Wall -ferror-limit=3 -Werror=incompatible-pointer-types -Werror=return-type -Wno-error=incompatible-pointer-types-discards-qualifiers -Wno-incompatible-pointer-types-discards-qualifiers -Wno-error=array-parameter -I/opt/homebrew/opt/llvm/include -I./raylib-5.5_macos/include -I./src -I./vendor ocean/breakout/breakout.c -o breakout raylib-5.5_macos/lib/libraylib.a -framework Cocoa -framework IOKit -framework CoreVideo -framework OpenGL -L/opt/homebrew/opt/llvm/lib -lm -lpthread -fopenmp -DPLATFORM_DESKTOP

wasaysir · 2026-05-09T05:37:40Z

I think I figured it out. I installed anaconda a while ago, and it looks like anaconda overrode the default MacOS linker with its own. This created a conflict when interacting with the llvm clang since they were on separate DWARF versions. Resetting to the default linker made it work perfectly.

I can confirm that your PR works on my machine. 😄

PLAZMAMA · 2026-05-09T15:37:06Z

Great! FYI, when I stopped working in this PR only local and cpu worked. This experience is nowhere near what Pufferlib can actually offer!

Please use Linux machine with an Nvidia GPU if you want to actually see an environment train at the true puffer speed.
Even on my Mac I just ssh into a Linux box.

Fix build.sh to use Homebrew LLVM paths on mac

cd1d1f4

PLAZMAMA mentioned this pull request Apr 13, 2026

PufferLib 4.0 macOS installation fixes #507

Open

fix accidental += when initializing INCLUDES in mac platform branch

cd52edc

PLAZMAMA changed the title ~~Fix build.sh to use Homebrew LLVM paths on mac~~ Fix build.sh to use Homebrew Clang on mac Apr 13, 2026

PLAZMAMA added 3 commits April 13, 2026 13:35

set CC and CXX and symlink lomp5

b932c13

compress syntax

942c7f5

fix '}' unexpected syntax issue

c5ae351

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Fix build.sh to use Homebrew Clang on mac#527

Fix build.sh to use Homebrew Clang on mac#527
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PLAZMAMA:root-cause-macos-clang-fix

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