From c880be445cb99aafc3e60268b4fb9a13c6ce9bd1 Mon Sep 17 00:00:00 2001
From: Conrad Kreyling <conrad@kreyling.biz>
Date: Fri, 2 Feb 2024 13:35:11 -0500
Subject: [PATCH] Enable ARM64 support on LLVM builds

---
 .github/workflows/llvm.yml | 2 ++
 build/Helpers.lua          | 5 +++++
 build/LLVM.lua             | 6 ++++++
 build/llvm/LLVM.lua        | 2 +-
 4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/llvm.yml b/.github/workflows/llvm.yml
index 57dc21d4b..87b31a680 100644
--- a/.github/workflows/llvm.yml
+++ b/.github/workflows/llvm.yml
@@ -10,8 +10,10 @@ jobs:
       matrix:
         config:
           - { os: ubuntu-22.04, platform: x64, cxx: g++-11, cc: gcc-11 }
+          - { os: ubuntu-22.04, platform: arm64, cxx: g++-11, cc: gcc-11 }
           - { os: macos-11, platform: x64, cxx: clang++, cc: clang }
           - { os: macos-12, platform: x64, cxx: clang++, cc: clang }
+          - { os: macos-12, platform: arm64, cxx: clang++, cc: clang }
 
     runs-on: ${{ matrix.config.os }}
 
diff --git a/build/Helpers.lua b/build/Helpers.lua
index 0a2e030d1..96a323547 100644
--- a/build/Helpers.lua
+++ b/build/Helpers.lua
@@ -10,6 +10,7 @@ newoption {
    allowed = {
       { "x86",  "x86 32-bits" },
       { "x64",  "x64 64-bits" },
+      { "arm64","ARM64 64-bits" },
    }
 }
 
@@ -251,11 +252,15 @@ function AddPlatformSpecificFiles(folder, filename)
     filter { "toolset:msc*", "architecture:x86" }
       files { path.join(folder, "i686-pc-win32-msvc", filename) }
   elseif os.istarget("macosx") then
+    filter { "architecture:arm64" }
+      files { path.join(folder, "arm64-apple-darwin12.4.0", filename) }
     filter { "architecture:x86_64" }
       files { path.join(folder, "x86_64-apple-darwin12.4.0", filename) }
     filter {"architecture:x86" }
       files { path.join(folder, "i686-apple-darwin12.4.0", filename) }
   elseif os.istarget("linux") then
+    filter { "architecture:arm64" }
+      files { path.join(folder, "arm64-linux-gnu" .. (UseCxx11ABI() and "-cxx11abi" or ""), filename) }
     filter { "architecture:x86_64" }
       files { path.join(folder, "x86_64-linux-gnu" .. (UseCxx11ABI() and "-cxx11abi" or ""), filename) }
   else
diff --git a/build/LLVM.lua b/build/LLVM.lua
index 86fa1be6b..9ac89c54c 100644
--- a/build/LLVM.lua
+++ b/build/LLVM.lua
@@ -172,6 +172,12 @@ function SetupLLVMLibs()
       "LLVMX86CodeGen",
       "LLVMX86Desc",
       "LLVMX86Info",
+      "LLVMAArch64AsmParser",
+      "LLVMAArch64CodeGen",
+      "LLVMAArch64Desc",
+      "LLVMAArch64Disassembler",
+      "LLVMAArch64Info",
+      "LLVMAArch64Utils",
       "LLVMipo",
       "LLVMInstrumentation",
       "LLVMVectorize",
diff --git a/build/llvm/LLVM.lua b/build/llvm/LLVM.lua
index f375b39e9..015743965 100644
--- a/build/llvm/LLVM.lua
+++ b/build/llvm/LLVM.lua
@@ -254,7 +254,7 @@ function cmake(gen, conf, builddir, options)
 		.. ' -DLLVM_ENABLE_ZSTD=false'
 		.. ' -DLLVM_INCLUDE_DOCS=false'
 		.. ' -DLLVM_INCLUDE_EXAMPLES=false'
-		.. ' -DLLVM_TARGETS_TO_BUILD="X86"'
+		.. ' -DLLVM_TARGETS_TO_BUILD="X86;AArch64"'
 		.. ' -DLLVM_TOOL_BUGPOINT_BUILD=false'
 		.. ' -DLLVM_TOOL_BUGPOINT_PASSES_BUILD=false'
 		.. ' -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=false'