From f71590d4c49493b533da81a55962c7429f5b5151 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Wed, 26 Mar 2025 23:19:35 +0100
Subject: [PATCH] build.zig: Statically link LLVM libraries for experimental
 targets if requested.

---
 build.zig | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

diff --git a/build.zig b/build.zig
index 9794514f1f..6f045f086b 100644
--- a/build.zig
+++ b/build.zig
@@ -326,7 +326,12 @@ pub fn build(b: *std.Build) !void {
             try addCmakeCfgOptionsToExe(b, cfg, exe, use_zig_libcxx);
         } else {
             // Here we are -Denable-llvm but no cmake integration.
-            try addStaticLlvmOptionsToModule(exe.root_module);
+            try addStaticLlvmOptionsToModule(exe.root_module, .{
+                .llvm_has_m68k = llvm_has_m68k,
+                .llvm_has_csky = llvm_has_csky,
+                .llvm_has_arc = llvm_has_arc,
+                .llvm_has_xtensa = llvm_has_xtensa,
+            });
         }
         if (target.result.os.tag == .windows) {
             // LLVM depends on networking as of version 18.
@@ -809,7 +814,12 @@ fn addCmakeCfgOptionsToExe(
     }
 }
 
-fn addStaticLlvmOptionsToModule(mod: *std.Build.Module) !void {
+fn addStaticLlvmOptionsToModule(mod: *std.Build.Module, options: struct {
+    llvm_has_m68k: bool,
+    llvm_has_csky: bool,
+    llvm_has_arc: bool,
+    llvm_has_xtensa: bool,
+}) !void {
     // Adds the Zig C++ sources which both stage1 and stage2 need.
     //
     // We need this because otherwise zig_clang_cc1_main.cpp ends up pulling
@@ -833,6 +843,22 @@ fn addStaticLlvmOptionsToModule(mod: *std.Build.Module) !void {
         mod.linkSystemLibrary(lib_name, .{});
     }
 
+    if (options.llvm_has_m68k) for (llvm_libs_m68k) |lib_name| {
+        mod.linkSystemLibrary(lib_name, .{});
+    };
+
+    if (options.llvm_has_csky) for (llvm_libs_csky) |lib_name| {
+        mod.linkSystemLibrary(lib_name, .{});
+    };
+
+    if (options.llvm_has_arc) for (llvm_libs_arc) |lib_name| {
+        mod.linkSystemLibrary(lib_name, .{});
+    };
+
+    if (options.llvm_has_xtensa) for (llvm_libs_xtensa) |lib_name| {
+        mod.linkSystemLibrary(lib_name, .{});
+    };
+
     mod.linkSystemLibrary("z", .{});
     mod.linkSystemLibrary("zstd", .{});
 
@@ -1321,6 +1347,33 @@ const llvm_libs = [_][]const u8{
     "LLVMSupport",
     "LLVMDemangle",
 };
+const llvm_libs_m68k = [_][]const u8{
+    "LLVMM68kDisassembler",
+    "LLVMM68kAsmParser",
+    "LLVMM68kCodeGen",
+    "LLVMM68kDesc",
+    "LLVMM68kInfo",
+};
+const llvm_libs_csky = [_][]const u8{
+    "LLVMCSKYDisassembler",
+    "LLVMCSKYAsmParser",
+    "LLVMCSKYCodeGen",
+    "LLVMCSKYDesc",
+    "LLVMCSKYInfo",
+};
+const llvm_libs_arc = [_][]const u8{
+    "LLVMARCDisassembler",
+    "LLVMARCCodeGen",
+    "LLVMARCDesc",
+    "LLVMARCInfo",
+};
+const llvm_libs_xtensa = [_][]const u8{
+    "LLVMXtensaDisassembler",
+    "LLVMXtensaAsmParser",
+    "LLVMXtensaCodeGen",
+    "LLVMXtensaDesc",
+    "LLVMXtensaInfo",
+};
 
 fn generateLangRef(b: *std.Build) std.Build.LazyPath {
     const doctest_exe = b.addExecutable(.{