libghostty-vt: fix linker tests for darwin

nix/libghostty-vt.nix

@@ -103,14 +103,25 @@ stdenv.mkDerivation (finalAttrs: {
       --replace-fail "$out" "$dev"
   '';
 
-  passthru.tests = {
+  passthru.tests = let
+    sharedExt = stdenv.hostPlatform.extensions.sharedLibrary;
+    sharedLibName = version:
+      if stdenv.hostPlatform.isDarwin
+      then "libghostty-vt.${version}${sharedExt}"
+      else "libghostty-vt${sharedExt}.${version}";
+    linkCheck = bin: pat:
+      if stdenv.hostPlatform.isDarwin
+      then ''otool -L "${bin}" | grep -q ${pat}''
+      else ''ldd "${bin}" 2>/dev/null | grep -q ${pat}'';
+  in {
     sanity-check = let
       version = "${lib.versions.major finalAttrs.version}.${lib.versions.minor finalAttrs.version}.${lib.versions.patch finalAttrs.version}";
     in
       runCommand "sanity-check" {} (builtins.concatStringsSep "\n" [
         ''
-          ${lib.getExe' stdenv.cc "nm"} "${finalAttrs.finalPackage}/lib/libghostty-vt.so.${version}" | grep -q 'T ghostty_terminal_new'
+          set +o pipefail
-          ${lib.getExe' stdenv.cc "nm"} "${finalAttrs.finalPackage.dev}/lib/libghostty-vt.a" | grep -q 'T ghostty_terminal_new'
+          ${lib.getExe' stdenv.cc "nm"} "${finalAttrs.finalPackage}/lib/${sharedLibName version}" | grep -qE 'T _?ghostty_terminal_new'
+          ${lib.getExe' stdenv.cc "nm"} "${finalAttrs.finalPackage.dev}/lib/libghostty-vt.a" | grep -qE 'T _?ghostty_terminal_new'
         ''
         (
           lib.optionalString simd
@@ -167,7 +178,7 @@ stdenv.mkDerivation (finalAttrs: {
           then "yes"
           else "no"
         }"
-        ldd "$out/bin/test" 2>/dev/null | grep -q libghostty-vt
+        ${linkCheck "$out/bin/test" "libghostty-vt"}
 
         runHook postInstallCheckHooks
       '';
@@ -205,7 +216,7 @@ stdenv.mkDerivation (finalAttrs: {
           then "yes"
           else "no"
         }"
-        ! ldd "$out/bin/test" 2>/dev/null | grep -q libghostty-vt
+        ! ${linkCheck "$out/bin/test" "libghostty-vt"}
 
         runHook postInstallCheckHooks
       '';
@@ -240,7 +251,7 @@ stdenv.mkDerivation (finalAttrs: {
       installCheckPhase = ''
         runHook preInstallCheckHooks
 
-        ldd "$out/bin/test" 2>/dev/null | grep -q libghostty-vt
+        ${linkCheck "$out/bin/test" "libghostty-vt"}
 
         runHook postInstallCheckHooks
       '';