Fix “This version of lld does not support linking”

Author: kabiroberai

Dockerfile

@@ -1,9 +1,14 @@
 FROM alpine:3.20
 
-RUN apk add cmake ninja clang lld python3 git
+RUN apk add cmake ninja clang lld python3 git patch
 
 ENV CC=clang CXX=clang++
 
+COPY build.sh /work/build.sh
+COPY patches /work/patches
+COPY llvm-project /work/llvm-project
+RUN patch -p1 -d /work/llvm-project < /work/patches/lld-support-macho-files.patch
+
 WORKDIR /work
 
 ENTRYPOINT [ "/bin/sh" ]

build.sh

@@ -6,7 +6,7 @@ root="${PWD}"
 stage="${root}/build/bin"
 install="${root}/build/install"
 
-rm -rf "${install}" "${stage}" output
+rm -rf "${install}" "${stage}" output/toolset.tar.gz
 mkdir -p "${install}" "${stage}" output
 
 echo "[info] Building..."

docker-compose.yml

@@ -3,8 +3,7 @@ services:
     build:
       context: .
     volumes:
-      - .:/work
-      - build:/work/build
+      - ./output:/work/output
     container_name: builder
     stdin_open: true
     tty: true

patches/lld-support-macho-files.patch

@@ -0,0 +1,16 @@
+diff --git a/lld/MachO/InputFiles.cpp b/lld/MachO/InputFiles.cpp
+index 47135196b369..c3f7c434ffca 100644
+--- a/lld/MachO/InputFiles.cpp
++++ b/lld/MachO/InputFiles.cpp
+@@ -157,11 +157,6 @@ static bool checkCompatibility(const InputFile *input) {
+   if (platformInfos.empty())
+     return true;
+ 
+-  // Swift LLVM fork downstream change start
+-  error("This version of lld does not support linking for platform " + getPlatformName(platformInfos.front().target.Platform));
+-  return false;
+-  // Swift LLVM fork downstream change end
+-
+   auto it = find_if(platformInfos, [&](const PlatformInfo &info) {
+     return removeSimulator(info.target.Platform) ==
+            removeSimulator(config->platform());