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Add Apple Silicon (arm64) macOS build support. #17

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14 changes: 14 additions & 0 deletions build/osx/arm64_osx.mk
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##
## arm64 OSX (Apple Silicon) Makefile
## Tested on Apple M4
## Use make
##
TargetCPU :=arm64
OS :=osx
# -include: modern macOS g++ is clang++/libc++, which lacks abi::__forced_unwind
# that the OSX sources expect from libstdc++-era toolchains.
CXXFLAGS := -O3 -fPIC -pedantic -arch arm64 -include forced_unwind_stub.h

# Standard part

include common.mk
6 changes: 6 additions & 0 deletions build/osx/forced_unwind_stub.h
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// Apple libc++ has no abi::__forced_unwind (Linux libstdc++ pthread cancel).
// Force-included by arm64_osx.mk so upstream snap_threads.cpp compiles unchanged.
#pragma once
namespace __cxxabiv1 {
struct __forced_unwind {};
}