https://bugs.gentoo.org/771744
https://github.com/WebKit/WebKit/pull/12358

From 5cda2bac84e6900401810b56ba4de82de714cae0 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Tue, 4 Apr 2023 04:31:01 +0100
Subject: [PATCH] postprocess-asm rule doesn't respect RUBY_EXECUTABLE
 https://bugs.webkit.org/show_bug.cgi?id=254965

Reviewed by NOBODY (OOPS!).

postprocess-asm is a Ruby script with #/!/usr/bin/env ruby as its shebang which
looks up Ruby in PATH. webkit, however, has RUBY_EXECUTABLE as a CMake option.
It's possible for the Ruby used by CMake (and the other rules during the build)
to be different to the first Ruby found in PATH. This makes the usage for postprocess-asm
consistent with other uses in webkit.

* Source/JavaScriptCore/CMakeLists.txt
--- a/Source/JavaScriptCore/CMakeLists.txt
+++ b/Source/JavaScriptCore/CMakeLists.txt
@@ -1507,7 +1507,7 @@ endif ()
 if (CMAKE_COMPILER_IS_GNUCXX AND GCC_OFFLINEASM_SOURCE_MAP)
     message(STATUS "Enabling asm postprocessing")
 
-    set(LowLevelInterpreter_LAUNCHER "${JavaScriptCore_SCRIPTS_SOURCES_DIR}/postprocess-asm")
+    set(LowLevelInterpreter_LAUNCHER "${RUBY_EXECUTABLE} ${JavaScriptCore_SCRIPTS_SOURCES_DIR}/postprocess-asm")
     get_target_property(PROP_RULE_LAUNCH_COMPILE LowLevelInterpreterLib RULE_LAUNCH_COMPILE)
     if (PROP_RULE_LAUNCH_COMPILE)
         set(LowLevelInterpreter_LAUNCHER "${LowLevelInterpreter_LAUNCHER} ${PROP_RULE_LAUNCH_COMPILE}")