Move GCC dependency and usage to Linux only

GCC is now only required on Linux for building and testing, and related environment variables and gcov usage are set conditionally for Linux. This avoids unnecessary GCC dependency and configuration on non-Linux platforms.

Author: ReenigneArcher

packaging/sunshine.rb

@@ -31,7 +31,6 @@ class Sunshine < Formula
 
   depends_on "cmake" => :build
   depends_on "doxygen" => :build
-  depends_on GCC_FORMULA => [:build, :test]
   depends_on "graphviz" => :build
   depends_on "node" => :build
   depends_on "pkgconf" => :build
@@ -48,6 +47,7 @@ class Sunshine < Formula
   end
 
   on_linux do
+    depends_on GCC_FORMULA => [:build, :test]
     depends_on "avahi"
     depends_on "gnu-which"
     depends_on "libayatana-appindicator"
@@ -85,10 +85,12 @@ def install
     ENV["BUILD_VERSION"] = "@BUILD_VERSION@"
     ENV["COMMIT"] = "@GITHUB_COMMIT@"
 
-    # Use GCC because gcov from llvm cannot handle our paths
-    gcc_path = Formula[GCC_FORMULA]
-    ENV["CC"] = "#{gcc_path.opt_bin}/gcc-#{GCC_VERSION}"
-    ENV["CXX"] = "#{gcc_path.opt_bin}/g++-#{GCC_VERSION}"
+    if OS.linux?
+      # Use GCC because gcov from llvm cannot handle our paths
+      gcc_path = Formula[GCC_FORMULA]
+      ENV["CC"] = "#{gcc_path.opt_bin}/gcc-#{GCC_VERSION}"
+      ENV["CXX"] = "#{gcc_path.opt_bin}/g++-#{GCC_VERSION}"
+    end
 
     args = %W[
       -DBUILD_WERROR=ON
@@ -192,8 +194,12 @@ def caveats
       # Change to the source directory for gcovr to work properly
       cd "#{buildpath}/build" do
         # Use GCC version to match what was used during compilation
-        gcc_path = Formula[GCC_FORMULA]
-        gcov_executable = "#{gcc_path.opt_bin}/gcov-#{GCC_VERSION}"
+        if OS.linux?
+          gcc_path = Formula[GCC_FORMULA]
+          gcov_executable = "#{gcc_path.opt_bin}/gcov-#{GCC_VERSION}"
+        else
+          gcov_executable = "gcov"
+        end
 
         system "gcovr", ".",
           "-r", "../src",