From 7b2628c8d65f1f4c2ed8a9367741107b3cb076ba Mon Sep 17 00:00:00 2001
From: Michka Popoff <michkapopoff@gmail.com>
Date: Tue, 14 Feb 2023 23:22:17 +0400
Subject: [PATCH] build.zig: enable headerpad_max_install_names on MacOs

Fixes error during packing on MacOS with Homebrew:
Error: Failed changing dylib ID of /usr/local/Cellar/fastfec/0.1.9/lib/libfastfec.dylib
  from @rpath/libfastfec.dylib
    to /usr/local/opt/fastfec/lib/libfastfec.dylib
Error: Failed to fix install linkage

and

  Error: Failed changing install name in /opt/homebrew/Cellar/fastfec/0.1.9/bin/fastfec
    from /opt/homebrew/opt/pcre/lib/libpcre.1.dylib
      to @@HOMEBREW_PREFIX@@/opt/pcre/lib/libpcre.1.dylib

See https://github.com/ziglang/zig/issues/13388, where this is inspired from
---
 build.zig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/build.zig b/build.zig
index 4836924..04f581b 100644
--- a/build.zig
+++ b/build.zig
@@ -12,6 +12,11 @@ pub fn linkPcre(vendored_pcre: bool, libExe: *std.build.LibExeObjStep) void {
             libExe.linkSystemLibrary("libpcre");
         }
     }
+    if (libExe.target.isDarwin()) {
+      // useful for package maintainers
+      // see https://github.com/ziglang/zig/issues/13388
+      libExe.headerpad_max_install_names = true;
+    }
 }
 
 pub fn build(b: *std.build.Builder) !void {
@@ -45,6 +50,11 @@ pub fn build(b: *std.build.Builder) !void {
         // Library build step
         const fastfec_lib = b.addSharedLibrary("fastfec", null, .unversioned);
         fastfec_lib.setTarget(target);
+        if (fastfec_lib.target.isDarwin()) {
+          // useful for package maintainers
+          // see https://github.com/ziglang/zig/issues/13388
+          fastfec_lib.headerpad_max_install_names = true;
+        }
         fastfec_lib.setBuildMode(mode);
         fastfec_lib.install();
         fastfec_lib.linkLibC();