Merge pull request #741 from tdsmith/weak-imports-opt-in

Add permit_weak_imports directive

Library/Homebrew/extend/ENV/shared.rb

@@ -293,6 +293,8 @@ module SharedEnvExtension
 
   def permit_arch_flags; end
 
+  def permit_weak_imports; end
+
   private
 
   def cc=(val)

Library/Homebrew/extend/ENV/super.rb

@@ -78,6 +78,7 @@ module Superenv
     # g - Enable "-stdlib=libc++" for clang.
     # h - Enable "-stdlib=libstdc++" for clang.
     # K - Don't strip -arch <arch>, -m32, or -m64
+    # w - Pass -no_weak_imports to the linker
     #
     # On 10.8 and newer, these flags will also be present:
     # s - apply fix for sed's Unicode support

Library/Homebrew/extend/os/mac/extend/ENV/std.rb

@@ -146,4 +146,8 @@ module Stdenv
 
     append "CFLAGS", "-I#{MacOS::X11.include}" unless MacOS::CLT.installed?
   end
+
+  def permit_weak_imports
+    remove "LDFLAGS", "-Wl,-no_weak_imports"
+  end
 end

Library/Homebrew/extend/os/mac/extend/ENV/super.rb

@@ -107,6 +107,10 @@ module Superenv
     ENV.x11 = MacOS::X11.installed?
   end
 
+  def permit_weak_imports
+    remove "HOMEBREW_CCCFG", "w"
+  end
+
   # These methods are no longer necessary under superenv, but are needed to
   # maintain an interface compatible with stdenv.
   alias_method :macosxsdk, :noop