workaround for enabling rvv

Author: howjmay

riscv-gnu-toolchain.rb

@@ -36,6 +36,7 @@ class RiscvGnuToolchain < Formula
 
   # enabling multilib by default, must choose to build without
   option "with-NOmultilib", "Build WITHOUT multilib support"
+  option "with-enable-rvv", "Workaround to enable RISCV Vector Extension"
 
   depends_on "gawk" => :build
   depends_on "gnu-sed" => :build
@@ -51,10 +52,15 @@ def install
     # disable crazy flag additions
     ENV.delete "CPATH"
 
+    if build.with?("enable-rvv")
+      puts "Enable RISCV Vector Extension"
+      system "cd", "gcc", " | ", "git", "checkout", "releases/gcc-13"
+    end
+
     # need to pull in needed submodules (now that they are disabled above)
     system "git", "submodule", "update", "--init", "--recursive", "newlib"
     system "git", "submodule", "update", "--init", "--recursive", "binutils"
-    system "git", "submodule", "update", "--init", "--recursive", "gcc"
+    system "git", "submodule", "update", "--init", "--recursive", "gcc"    
 
     args = [
       "--prefix=#{prefix}",

riscv-tools.rb

@@ -5,8 +5,10 @@ class RiscvTools < Formula
   version "0.2"
   sha256 "cb919eb7cf11071c6d11c721a9e77893a2dbe9158466e444eb3dd8476a89b7b4"
 
+  option "with-enable-rvv", "Workaround to enable RISCV Vector Extension"
+  
   # install rest of tools
-  depends_on "riscv-gnu-toolchain"
+  depends_on "riscv-gnu-toolchain" => [:build, "--with-enable-rvv"]
   depends_on "riscv-isa-sim"
   depends_on "riscv-pk"