test build hooks overwriting entire vars hash as a non-backwards-compatiblity test

build_tests/typical/backward_compatible_build_hooks.rb

@@ -1,25 +0,0 @@
-class MyObject < Rscons::Builder
-  def run(options)
-    target, sources, cache, env, vars = options.values_at(:target, :sources, :cache, :env, :vars)
-    env.run_builder(env.builders["Object"].new(target: target, sources: sources, cache: cache, env: env, vars: vars), target, sources, cache, vars)
-  end
-end
-
-build do
-  Environment.new(echo: :command) do |env|
-    env.add_builder(MyObject)
-    env.append('CPPPATH' => Rscons.glob('src/**'))
-    env.add_build_hook do |build_op|
-      if build_op[:builder].name == "MyObject" && build_op[:sources].first =~ %r{one\.c}
-        build_op[:vars]["CFLAGS"] << "-O1"
-        build_op[:sources] = ['src/two/two.c']
-      elsif build_op[:builder].name == "MyObject" && build_op[:target] =~ %r{two\.o}
-        new_vars = build_op[:vars].clone
-        new_vars["CFLAGS"] << "-O2"
-        build_op[:vars] = new_vars
-      end
-    end
-    env.MyObject('one.o', 'src/one/one.c')
-    env.MyObject('two.o', 'src/two/two.c')
-  end
-end

build_tests/typical/build_hooks_override_vars.rb

@@ -0,0 +1,17 @@
+build do
+  Environment.new(echo: :command) do |env|
+    env.append('CPPPATH' => Rscons.glob('src/**'))
+    env.add_build_hook do |build_op|
+      if build_op[:builder].name == "Object" && build_op[:sources].first =~ %r{one\.c}
+        build_op[:vars]["CFLAGS"] << "-O1"
+        build_op[:sources] = ['src/two/two.c']
+      elsif build_op[:builder].name == "Object" && build_op[:target] =~ %r{two\.o}
+        new_vars = build_op[:vars].clone
+        new_vars["CFLAGS"] << "-O2"
+        build_op[:vars] = new_vars
+      end
+    end
+    env.Object('one.o', 'src/one/one.c')
+    env.Object('two.o', 'src/two/two.c')
+  end
+end

spec/build_tests_spec.rb

@@ -402,6 +402,18 @@ EOF
     expect(`./build_hook.exe`).to eq "Hello from two()\n"
   end
 
+  it 'supports build hooks to override the entire vars hash' do
+    test_dir("typical")
+    result = run_rscons(rsconscript: "build_hooks_override_vars.rb")
+    expect(result.stderr).to eq ""
+    expect(lines(result.stdout)).to include *[
+      'gcc -c -o one.o -MMD -MF one.mf -Isrc -Isrc/one -Isrc/two -O1 src/two/two.c',
+      'gcc -c -o two.o -MMD -MF two.mf -Isrc -Isrc/one -Isrc/two -O2 src/two/two.c'
+    ]
+    expect(File.exists?('one.o')).to be_truthy
+    expect(File.exists?('two.o')).to be_truthy
+  end
+
   it 'rebuilds when user-specified dependencies change' do
     test_dir('simple')
 
@@ -851,18 +863,6 @@ EOF
       expect(result.stderr).to match /Failed to build/
       expect(result.stdout).to match /Failed command was: gcc/
     end
-
-    it 'supports build hooks to override construction variables' do
-      test_dir("typical")
-      result = run_rscons(rsconscript: "backward_compatible_build_hooks.rb")
-      expect(result.stderr).to eq ""
-      expect(lines(result.stdout)).to include *[
-        'gcc -c -o one.o -MMD -MF one.mf -Isrc -Isrc/one -Isrc/two -O1 src/two/two.c',
-        'gcc -c -o two.o -MMD -MF two.mf -Isrc -Isrc/one -Isrc/two -O2 src/two/two.c'
-      ]
-      expect(File.exists?('one.o')).to be_truthy
-      expect(File.exists?('two.o')).to be_truthy
-    end
   end
 
   context "CFile builder" do