mold(v1.1.1): fix read_symlink("/proc/self/exe") error in macOS

mold-macos.patch

diff --git a/elf/lto.cc b/elf/lto.cc
index 30060ed4..38f9aa17 100644
--- a/elf/lto.cc
+++ b/elf/lto.cc
@@ -88,6 +88,11 @@
 #include <sstream>
 #include <unistd.h>
 
+#if defined(__APPLE__) && defined(__MACH__)
+#include <sys/param.h>
+#include <mach-o/dyld.h>
+#endif
+
 #if 0
 # define LOG std::cerr
 #else
@@ -591,7 +596,15 @@ static void restart_process(Context<E> &ctx) {
   args.push_back("--:lto-pass2");
   args.push_back(nullptr);
 
+#if defined(__APPLE__) && defined(__MACH__)
+  char path[MAXPATHLEN+1];
+  uint32_t size = sizeof(path);
+  _NSGetExecutablePath(path, &size);
+  std::string self = std::string(path);
+#else
   std::string self = std::filesystem::read_symlink("/proc/self/exe");
+#endif
+
 
   std::cout << std::flush;
   std::cerr << std::flush;
diff --git a/elf/subprocess.cc b/elf/subprocess.cc
index edd13a10..0bd2942c 100644
--- a/elf/subprocess.cc
+++ b/elf/subprocess.cc
@@ -12,6 +12,11 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
+#if defined(__APPLE__) && defined(__MACH__)
+#include <sys/param.h>
+#include <mach-o/dyld.h>
+#endif
+
 #define DAEMON_TIMEOUT 30
 
 namespace mold::elf {
@@ -247,7 +252,14 @@ void daemonize(Context<E> &ctx, std::function<void()> *wait_for_client,
 }
 
 static std::string get_self_path() {
+#if defined(__APPLE__) && defined(__MACH__)
+  char path[MAXPATHLEN+1];
+  uint32_t size = sizeof(path);
+  _NSGetExecutablePath(path, &size);
+  return std::string(path);
+#else
   return std::filesystem::read_symlink("/proc/self/exe");
+#endif
 }
 
 template <typename E>

$ sw_vers  
ProductName:    macOS
ProductVersion: 12.2.1
BuildVersion:   21D62

$ sysctl machdep.cpu.brand_string
machdep.cpu.brand_string: Apple M1 Max