Support core GCC formula as a GCC compiler.

It is activated by the same mechanism as the Homebrew/versions compilers
which now check if the GCC formula uses the same, correct version.

References Homebrew/homebrew#28418.

3 files changed, 25 insertions, 9 deletions

diff --git a/Library/Homebrew/extend/ENV/shared.rb b/Library/Homebrew/extend/ENV/shared.rb
index 924ac77ca..2964fbd16 100644
--- a/Library/Homebrew/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/ENV/shared.rb
@@ -185,11 +185,29 @@ module SharedEnvExtension
     append "LDFLAGS", "-B#{ld64.bin}/"
   end
 
+  def gcc_version_formula(version)
+    gcc_formula = Formulary.factory("gcc")
+    return gcc_formula if gcc_formula.version.to_s.include?(version)
+
+    gcc_name = 'gcc' + version.delete('.')
+    Formulary.factory(gcc_name)
+  end
+
   def warn_about_non_apple_gcc(gcc)
+    gcc_name = 'gcc' + gcc.delete('.')
+
     begin
-      gcc_name = 'gcc' + gcc.delete('.')
-      gcc = Formulary.factory(gcc_name)
-      if !gcc.opt_prefix.exist?
+      gcc_formula = gcc_version_formula(gcc)
+      if gcc_formula.name == "gcc"
+        return if gcc_formula.opt_prefix.exist?
+        raise <<-EOS.undent
+        The Homebrew GCC was not installed.
+        You must:
+          brew install gcc
+        EOS
+      end
+
+      if !gcc_formula.opt_prefix.exist?
         raise <<-EOS.undent
         The requested Homebrew GCC, #{gcc_name}, was not installed.
         You must:
diff --git a/Library/Homebrew/extend/ENV/std.rb b/Library/Homebrew/extend/ENV/std.rb
index c8beee949..bbf5d3b03 100644
--- a/Library/Homebrew/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/ENV/std.rb
@@ -73,9 +73,8 @@ module Stdenv
 
     if cc =~ GNU_GCC_REGEXP
       warn_about_non_apple_gcc($1)
-      gcc_name = 'gcc' + $1.delete('.')
-      gcc = Formulary.factory(gcc_name)
-      self.append_path('PATH', gcc.opt_prefix/'bin')
+      gcc_formula = gcc_version_formula($1)
+      self.append_path('PATH', gcc_formula.opt_prefix/'bin')
     end
 
     # Add lib and include etc. from the current macosxsdk to compiler flags:
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index 14253ff88..138741757 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -135,9 +135,8 @@ module Superenv
     end
 
     if self['HOMEBREW_CC'] =~ GNU_GCC_REGEXP
-      gcc_name = 'gcc' + $1.delete('.')
-      gcc = Formulary.factory(gcc_name)
-      paths << gcc.opt_prefix/'bin'
+      gcc_formula = gcc_version_formula($1)
+      paths << gcc_formula.opt_prefix/'bin'
     end
 
     paths.to_path_s