Move the compiler-selecting methods to ENV/shared

Closes Homebrew/homebrew#30210.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Homebrew/extend/ENV/shared.rb

@@ -13,6 +13,9 @@ module SharedEnvExtension
                           'llvm-gcc' => :llvm,
                           'clang'    => :clang }
 
+  COMPILERS = COMPILER_SYMBOL_MAP.values +
+    GNU_GCC_VERSIONS.map { |n| "gcc-4.#{n}" }
+
   SANITIZED_VARS = %w[
     CDPATH GREP_OPTIONS CLICOLOR_FORCE
     CPATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH OBJC_INCLUDE_PATH
@@ -108,6 +111,18 @@ module SharedEnvExtension
     end
   end
 
+  def determine_cc
+    COMPILER_SYMBOL_MAP.invert.fetch(compiler, compiler)
+  end
+
+  COMPILERS.each do |x|
+    define_method x do
+      @compiler = x
+      self.cc  = determine_cc
+      self.cxx = determine_cxx
+    end
+  end
+
   # If the given compiler isn't compatible, will try to select
   # an alternate compiler, altering the value of environment variables.
   # If no valid compiler is found, raises an exception.

Library/Homebrew/extend/ENV/std.rb

@@ -95,47 +95,46 @@ module Stdenv
     end
   end
 
-  def gcc_4_0_1
-    self.cc  = MacOS.locate("gcc-4.0")
-    self.cxx = MacOS.locate("g++-4.0")
-    set_cpu_cflags '-march=nocona -mssse3'
-    @compiler = :gcc_4_0
+  def determine_cc
+    s = super
+    MacOS.locate(s) || Pathname.new(s)
   end
-  alias_method :gcc_4_0, :gcc_4_0_1
+
+  def determine_cxx
+    path = determine_cc
+    dir, base = path.dirname, path.basename
+    dir / base.to_s.sub("gcc", "g++").sub("clang", "clang++")
+  end
+
+  def gcc_4_0
+    super
+    set_cpu_cflags '-march=nocona -mssse3'
+  end
+  alias_method :gcc_4_0_1, :gcc_4_0
 
   def gcc
-    self.cc  = MacOS.locate("gcc-4.2")
-    self.cxx = MacOS.locate("g++-4.2")
+    super
     set_cpu_cflags
-    @compiler = :gcc
   end
   alias_method :gcc_4_2, :gcc
 
   GNU_GCC_VERSIONS.each do |n|
     define_method(:"gcc-4.#{n}") do
-      gcc = "gcc-4.#{n}"
-      gxx = gcc.gsub('c', '+')
-      self.cc = MacOS.locate(gcc)
-      self.cxx = MacOS.locate(gxx)
+      super()
       set_cpu_cflags
-      @compiler = gcc
     end
   end
 
   def llvm
-    self.cc  = MacOS.locate("llvm-gcc")
-    self.cxx = MacOS.locate("llvm-g++")
+    super
     set_cpu_cflags
-    @compiler = :llvm
   end
 
   def clang
-    self.cc  = MacOS.locate("clang")
-    self.cxx = MacOS.locate("clang++")
+    super
     replace_in_cflags(/-Xarch_#{Hardware::CPU.arch_32_bit} (-march=\S*)/, '\1')
     # Clang mistakenly enables AES-NI on plain Nehalem
     set_cpu_cflags '-march=native', :nehalem => '-march=native -Xclang -target-feature -Xclang -aes'
-    @compiler = :clang
   end
 
   def remove_macosxsdk version=MacOS.version

Library/Homebrew/extend/ENV/super.rb

@@ -103,11 +103,6 @@ module Superenv
     if MacOS::Xcode.without_clt? then MacOS.sdk_path.to_s else "" end
   end
 
-  def determine_cc
-    cc = compiler
-    COMPILER_SYMBOL_MAP.invert.fetch(cc, cc)
-  end
-
   def determine_cxx
     determine_cc.to_s.gsub('gcc', 'g++').gsub('clang', 'clang++')
   end
@@ -250,22 +245,6 @@ module Superenv
   end
   alias_method :j1, :deparallelize
 
-  COMPILER_SYMBOL_MAP.values.each do |compiler|
-    define_method compiler do
-      @compiler = compiler
-      self.cc  = determine_cc
-      self.cxx = determine_cxx
-    end
-  end
-
-  GNU_GCC_VERSIONS.each do |n|
-    define_method(:"gcc-4.#{n}") do
-      @compiler = "gcc-4.#{n}"
-      self.cc  = determine_cc
-      self.cxx = determine_cxx
-    end
-  end
-
   def make_jobs
     self['MAKEFLAGS'] =~ /-\w*j(\d)+/
     [$1.to_i, 1].max