From e6364478be7fd717b418363a374b511ee64d439d Mon Sep 17 00:00:00 2001
From: Michael Holmes <i.am@ceph3.us>
Date: Tue, 12 Dec 2023 10:17:08 -0500
Subject: [PATCH] gerbil: fix soname of libgerbil on darwin

The soname/identification of libgerbil on darwin is not correctly fixed up,
resulting in any binaries linked with libgerbil to attempt to link to
libgerbil in the temporary build dir from the gerbil derivation. This
means that any compiled gerbil program won't work as the propagated soname
will result in the binary being unable to correctly link with libgerbil.

Adding an Darwin-only step to use `install_name_tool` to fix up the soname
of libgerbil fixes this issue. We're using realpath here as the qualified
path to `libgerbil` is `$out/gerbil/$version/lib/libgerbil.so` and this is
an easier way to obtain the qualified path.

Fixes NixOS/nixpkgs#272967.
---
 pkgs/development/compilers/gerbil/build.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/compilers/gerbil/build.nix b/pkgs/development/compilers/gerbil/build.nix
index a0922ff9ccac..af983be968b0 100644
--- a/pkgs/development/compilers/gerbil/build.nix
+++ b/pkgs/development/compilers/gerbil/build.nix
@@ -106,6 +106,9 @@ stdenv.mkDerivation rec {
     ./install.sh
     (cd $out/bin ; ln -s ../gerbil/bin/* .)
     runHook postInstall
+  '' + lib.optionalString stdenv.isDarwin ''
+    libgerbil="$(realpath "$out/gerbil/lib/libgerbil.so")"
+    install_name_tool -id "$libgerbil" "$libgerbil"
   '';
 
   dontStrip = true;