Need to turn off precompiled headers to build Mac universal binary.

[abcbarryn]

MAME version

0.283

System information

Darwin dynamic8.s2.abcm.com 25.2.0 Darwin Kernel Version 25.2.0: Tue Nov 18 21:03:25 PST 2025; root:xnu-12377.61.12~1/RELEASE_ARM64_T8122 arm64
Xcode 26.2

INI configuration details

N/A

Emulated system/software

N/A

Incorrect behaviour

clang++: error: cannot use 'precompiled-header' output with multiple -arch options

Expected behaviour

Ability to compile a universal MacOS binary or cross compile an X86_64 binary on an Apple silicon ARM64 Mac.

Steps to reproduce

In the makefile on an Apple silicon Mac set these options:

ARCHOPTS = -Xclang -target-sdk-version=11.1 --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.1 -arch x86_64
ARCHOPTS_C = -Xclang -target-sdk-version=11.1 --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.1 -arch x86_64
ARCHOPTS_CXX = -Xclang -target-sdk-version=11.1 --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.1 -arch x86_64
ARCHOPTS_OBJC = -Xclang -target-sdk-version=11.1 --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.1 -arch x86_64
ARCHOPTS_OBJCXX = -Xclang -target-sdk-version=11.1 --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.1 -arch x86_64
# OPT_FLAGS =
LDOPTS = -Xclang -target-sdk-version=11.1 -Wl,-macos_version_min,11.1 --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk -mmacosx-version-min=11.1 -arch x86_64

The run:
make TARGETOS=macosx REGENIE=1 TOOLS=1

Additional details

I can build an X86_64 MAME binary on an Intel Mac and then use lipo to combine it with an ARM64 binary to make a universal binary, but I can't cross compile an X86_64 binary on an ARM64 Mac, or pass multiple -arch flags to compile a universal binary. I have been unable to find where to successfully set the NoPCH flag in the build system to disable precompiled headers so this will work.

[abcbarryn]

Note: I installed the SDK for MacOS 11.1 so my binaries would work on older Intel Macs, but this is not needed to reproduce this issue. MacOS 26 supports Intel-based Macs, specifically the late 2019 Mac Pro, late 2019 16-inch MacBook Pro, late 2020 13-inch MacBook Pro (4-port), and late 2020 27-inch iMac.

[ksherlock]

FWIW, I cross-compile an x64 build (using a separate build directory) with something like:

make -j9 ARCHOPTS="-target x86_64-apple-macos11" BUILDDIR=build-x64 \
  UNAME="Darwin x86_64 i386" UNAME_M=x86_64 UNAME_P=i386
  && mv mame mame-x64

The UNAME stuff was necessary when I first got it working, but that was a few years ago and may not be needed anymore. maybe it wasn't even needed then.

[abcbarryn]

Thank you very much! I'll try that!

[abcbarryn]

That worked. I actually ended up using:
make -j9 ARCHOPTS="-target x86_64-apple-macos11.1 -Xclang -target-sdk-version=11.1 --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk -mmacosx-version-min=11.1" UNAME="Darwin x86_64 i386" UNAME_M=x86_64 UNAME_P=i386 REGENIE=1 TOOLS=1