From b9fd4b6b279bd10846ea10f9046550dd92f1726b Mon Sep 17 00:00:00 2001
From: jnozsc <470215+jnozsc@users.noreply.github.com>
Date: Fri, 15 May 2020 13:07:31 -0700
Subject: [PATCH] nvc: use llvm as runtime dependency

---
 Formula/nvc.rb | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/Formula/nvc.rb b/Formula/nvc.rb
index 2ee07be3c6a58..fec921acf2c8e 100644
--- a/Formula/nvc.rb
+++ b/Formula/nvc.rb
@@ -1,8 +1,20 @@
 class Nvc < Formula
   desc "VHDL compiler and simulator"
   homepage "https://github.com/nickg/nvc"
-  url "https://github.com/nickg/nvc/releases/download/r1.4.0/nvc-1.4.0.tar.gz"
-  sha256 "1a874bde284408c137a93b22f8f12b5b8c3368cefe30f3a5458ccdeffa0c6ad6"
+  revision 1
+
+  stable do
+    url "https://github.com/nickg/nvc/releases/download/r1.4.0/nvc-1.4.0.tar.gz"
+    sha256 "1a874bde284408c137a93b22f8f12b5b8c3368cefe30f3a5458ccdeffa0c6ad6"
+    # Upstream issue, only fix on master branch
+    # at the end of installation, nvc tries to donwload from IEEE,
+    # however the IEEE website changes the download path
+    # this patch fixes this issue
+    patch do
+      url "https://github.com/nickg/nvc/commit/db4565c33f7effcab4c8b886d664398a85b653f6.patch?full_index=1"
+      sha256 "41a7de8c78730cbf674246abdc3e824ba26723db963536cb019ed9deb77dc0a3"
+    end
+  end
 
   bottle do
     sha256 "b80db7d1bf860cf294e21504ca5016949379eb09f5e91f2ada221f7c93e0a470" => :mojave
@@ -19,8 +31,10 @@ class Nvc < Formula
   end
 
   depends_on "check" => :build
-  depends_on "llvm" => :build
   depends_on "pkg-config" => :build
+  # llvm 8+ is not supported https://github.com/nickg/nvc/commit/c3d1ae5700cfba6070293ad1bb5a6c198c631195
+  # and llvm 7 has issue on stable https://github.com/nickg/nvc/commit/dfd5606a182e00d5f7a9e28902234b374c7b2863
+  depends_on "llvm@6"
 
   resource "vim-hdl-examples" do
     url "https://github.com/suoto/vim-hdl-examples.git",
@@ -30,7 +44,7 @@ class Nvc < Formula
   def install
     system "./autogen.sh" if build.head?
     system "./tools/fetch-ieee.sh"
-    system "./configure", "--with-llvm=#{Formula["llvm"].opt_bin}/llvm-config",
+    system "./configure", "--with-llvm=#{Formula["llvm@6"].opt_bin}/llvm-config",
                           "--prefix=#{prefix}",
                           "--with-system-cc=/usr/bin/clang"
     system "make"