[Mach-O] wip

macho/mold.h

@@ -454,7 +454,7 @@ public:
   void compute_size(Context &ctx) override;
   void copy_buf(Context &ctx) override;
 
-  std::string contents{"\0"};
+  std::string contents{1, '\0'};
 };
 
 class OutputIndirectSymtabSection : public Chunk {

test/macho/dead-strip.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+set -e
+cd $(dirname $0)
+mold=`pwd`/../../ld64.mold
+echo -n "Testing $(basename -s .sh $0) ... "
+t=$(pwd)/../../out/test/macho/$(basename -s .sh $0)
+mkdir -p $t
+
+cat <<EOF | cc -o $t/a.o -c -xc -
+#include <stdio.h>
+
+char msg1[] = "Hello world";
+char msg2[] = "Howdy world";
+
+void hello() {
+  printf("%s\n", msg1);
+}
+
+void howdy() {
+  printf("%s\n", msg2);
+}
+
+int main() {
+  hello();
+}
+EOF
+
+clang -fuse-ld=$mold -o $t/exe $t/a.o -Wl,-dead_strip
+$t/exe | grep -q 'Hello world'
+
+echo OK