Merge #7023

7023: Shellsplit build config r=deivid-rodriguez a=deivid-rodriguez

### What was the end-user problem that led to this PR?

The problem was #6940. Build configurations with multiple whitepaced parameter are no longer properly handled.

### What was your diagnosis of the problem?

My diagnosis was not mine, was @jeremy's: Since [shellscaping / shelljoining build arguments to the rubygems gem installer](https://github.com/bundler/bundler/issues/6940), these are no longer properly passed

### What is your fix for the problem, implemented in this PR?

My fix is not mine, it's @jeremy's: shellsplit settings before passing them.

### Why did you choose this fix out of the possible options?

I chose this fix because it works and it sounds like the proper followup to https://github.com/rubygems/rubygems/pull/2441.

Fixes #6940.

Co-authored-by: David Rodríguez <deivid.rodriguez@riseup.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/bundler/installer/gem_installer.rb b/lib/bundler/installer/gem_installer.rb
index e5e245f970..9689911d6c 100644
--- a/lib/bundler/installer/gem_installer.rb
+++ b/lib/bundler/installer/gem_installer.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "shellwords"
+
 module Bundler
   class GemInstaller
     attr_reader :spec, :standalone, :worker, :force, :installer
@@ -56,7 +58,9 @@ module Bundler
 
     def spec_settings
       # Fetch the build settings, if there are any
-      Bundler.settings["build.#{spec.name}"]
+      if settings = Bundler.settings["build.#{spec.name}"]
+        Shellwords.shellsplit(settings)
+      end
     end
 
     def install