fix(plv8): add headerpad_max_install_names for macOS builds

Add -headerpad_max_install_names linker flag to prevent 'install_name_tool:
changing install names or rpaths can't be redone' errors on macOS. This
allocates sufficient header space for install_name_tool to modify the
shared library during post-install processing.

Author: yvan-sraka

nix/ext/plv8.nix

@@ -57,7 +57,7 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optionals stdenv.isDarwin [
     "CC=${clang}/bin/clang"
     "CXX=${clang}/bin/clang++"
-    "SHLIB_LINK=-L${v8}/lib -lv8_monolith -Wl,-rpath,${v8}/lib"
+    "SHLIB_LINK=-L${v8}/lib -lv8_monolith -Wl,-rpath,${v8}/lib -Wl,-headerpad_max_install_names"
   ]
   ++ lib.optionals (!stdenv.isDarwin) [ "SHLIB_LINK=-lv8" ];
 
@@ -76,6 +76,7 @@ stdenv.mkDerivation (finalAttrs: {
       "-undefined"
       "dynamic_lookup"
       "-flat_namespace"
+      "-headerpad_max_install_names"
     ]
   );
 

nix/ext/plv8/default.nix

@@ -89,7 +89,7 @@ let
       ++ lib.optionals stdenv.isDarwin [
         "CC=${clang}/bin/clang"
         "CXX=${clang}/bin/clang++"
-        "SHLIB_LINK=-L${v8}/lib -lv8_monolith -Wl,-rpath,${v8}/lib"
+        "SHLIB_LINK=-L${v8}/lib -lv8_monolith -Wl,-rpath,${v8}/lib -Wl,-headerpad_max_install_names"
       ]
       ++ lib.optionals (!stdenv.isDarwin) [ "SHLIB_LINK=-lv8" ];
 
@@ -107,6 +107,7 @@ let
         "-undefined"
         "dynamic_lookup"
         "-flat_namespace"
+        "-headerpad_max_install_names"
       ];
 
       # No configure script.