From 1e55ee2961eabd6016dfef1793996ded97c9054c Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 23 Jun 2022 01:32:17 +0200
Subject: [PATCH] getSelfExe(): Support macOS

---
 src/libutil/util.cc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 82628461c..28df30fef 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -29,6 +29,7 @@
 
 #ifdef __APPLE__
 #include <sys/syscall.h>
+#include <mach-o/dyld.h>
 #endif
 
 #ifdef __linux__
@@ -635,10 +636,17 @@ Path getDataDir()
 
 std::optional<Path> getSelfExe()
 {
-    static std::optional<Path> cached = []()
+    static auto cached = []() -> std::optional<Path>
     {
         #if __linux__
         return readLink("/proc/self/exe");
+        #elif __APPLE__
+        char buf[1024];
+        uint32_t size = sizeof(buf);
+        if (_NSGetExecutablePath(buf, &size) == 0)
+            return buf;
+        else
+            return std::nullopt;
         #else
         return std::nullopt;
         #endif