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Add ARM64 (aarch64) build support for Darling on Linux #3

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kkHAIKE wants to merge 2 commits into from
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Add ARM64 (aarch64) build support for Darling on Linux #3

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b6112fd
Add ARM64 (aarch64) build support for Darling on Linux
kkHAIKE Mar 3, 2026
a196f59
Add ARM64 (aarch64) build support for Darling on Linux, part2
kkHAIKE May 15, 2026
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12 changes: 9 additions & 3 deletions runtime/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -15,15 +15,21 @@ endif(COMMAND cmake_policy)
add_definitions(-D__STDC_NO_ATOMICS__)

# Override DEBUG CFLAGS because -O0 has been triggering strange bugs
set(CMAKE_C_FLAGS_DEBUG "-ggdb -DOBJC_IS_DEBUG_BUILD=1")
set(CMAKE_CXX_FLAGS_DEBUG "-ggdb -DOBJC_IS_DEBUG_BUILD=1")
set(CMAKE_C_FLAGS_DEBUG "-ggdb")
set(CMAKE_CXX_FLAGS_DEBUG "-ggdb")

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -nostdinc -O2 -D__DARWIN_UNIX03 -fPIC -fblocks -fobjc-legacy-dispatch -fvisibility-inlines-hidden -fstrict-aliasing -fno-delete-null-pointer-checks")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nostdinc -nostdinc++ -O2 -std=gnu++14 -D__DARWIN_UNIX03 -fPIC -fblocks -fobjc-legacy-dispatch \
-fno-rtti -fno-exceptions -Wno-c++11-narrowing -fvisibility-inlines-hidden -Wno-invalid-offsetof -Wno-deprecated-objc-isa-usage \
-Wno-cast-of-sel-type -Wstrict-aliasing=2 -Wstrict-overflow=4 -fstrict-aliasing -fno-delete-null-pointer-checks")

add_definitions(-DOBJC_NO_GC -DOBJC_IS_DEBUG_BUILD=1)
# OBJC_IS_DEBUG_BUILD must match objc-config.h's DEBUG (which is !NDEBUG).
# Release/RelWithDebInfo/MinSizeRel inject -DNDEBUG -> DEBUG=0 -> need =0.
# Debug and empty build types do not -> DEBUG=1 -> need =1.
add_compile_definitions(
OBJC_NO_GC
$<IF:$<OR:$<CONFIG:Release>,$<CONFIG:RelWithDebInfo>,$<CONFIG:MinSizeRel>>,OBJC_IS_DEBUG_BUILD=0,OBJC_IS_DEBUG_BUILD=1>
)
add_definitions(-DTARGET_OS_IPHONE=0 -DOS_OBJECT_USE_OBJC=0 -D_LIBCPP_VISIBLE="")

include_directories(${CMAKE_CURRENT_SOURCE_DIR})
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19 changes: 19 additions & 0 deletions runtime/isa.h
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,25 @@
uintptr_t extra_rc : 8
# define RC_ONE (1ULL<<56)
# define RC_HALF (1ULL<<7)
# elif defined(DARLING) && defined(PLATFORM_MacOSX)
// Darling on ARM64 macOS: use same layout as x86_64 to cover
// the full macOS virtual address space (MACH_VM_MAX_ADDRESS 0x7FFFFE000000)
# define ISA_MASK 0x00007ffffffffff8ULL
# define ISA_MAGIC_MASK 0x001f800000000001ULL
# define ISA_MAGIC_VALUE 0x001d800000000001ULL
# define ISA_HAS_CXX_DTOR_BIT 1
# define ISA_BITFIELD \
uintptr_t nonpointer : 1; \
uintptr_t has_assoc : 1; \
uintptr_t has_cxx_dtor : 1; \
uintptr_t shiftcls : 44; /*MACH_VM_MAX_ADDRESS 0x7FFFFE000000*/ \
uintptr_t magic : 6; \
uintptr_t weakly_referenced : 1; \
uintptr_t unused : 1; \
uintptr_t has_sidetable_rc : 1; \
uintptr_t extra_rc : 8
# define RC_ONE (1ULL<<56)
# define RC_HALF (1ULL<<7)
# else
# define ISA_MASK 0x0000000ffffffff8ULL
# define ISA_MAGIC_MASK 0x000003f000000001ULL
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