Place object files for absolute source paths under build_root - close #30

spec/build_tests_spec.rb

@@ -662,6 +662,15 @@ EOF
     ]
   end
 
+  it "creates object files under the build root for absolute source paths" do
+    test_dir("simple")
+    result = run_test(rsconsfile: "absolute_source_path.rb")
+    expect(result.stderr).to eq ""
+    slines = lines(result.stdout)
+    expect(slines[0]).to match(%r{^CC build/.*/abs\.o$})
+    expect(slines[1]).to eq "LD abs.exe"
+  end
+
   context "backward compatibility" do
     it "allows a builder to call Environment#run_builder in a non-threaded manner" do
       test_dir("simple")

spec/rscons/environment_spec.rb

@@ -91,12 +91,13 @@ module Rscons
         end
 
         context "with a build_root" do
-          it "uses the build_root unless the path is absolute" do
+          it "uses the build_root" do
+            stub_const("RUBY_PLATFORM", "mingw")
             env = Environment.new
             env.build_root = "build/proj"
             expect(env.get_build_fname("src/dir/file.c", ".o")).to eq "build/proj/src/dir/file.o"
-            expect(env.get_build_fname("/some/lib.c", ".a")).to eq "/some/lib.a"
-            expect(env.get_build_fname("C:\\abspath\\mod.cc", ".o")).to eq "C:/abspath/mod.o"
+            expect(env.get_build_fname("/some/lib.c", ".a")).to eq "build/proj/_/some/lib.a"
+            expect(env.get_build_fname("C:\\abspath\\mod.cc", ".o")).to eq "build/proj/_C/abspath/mod.o"
             expect(env.get_build_fname("build\\proj\\generated.c", ".o")).to eq "build/proj/generated.o"
             expect(env.get_build_fname("build/proj.XX", ".yy")).to eq "build/proj/build/proj.yy"
           end

spec/rscons_spec.rb

@@ -24,6 +24,34 @@ describe Rscons do
     end
   end
 
+  describe ".absolute_path?" do
+    context "on Windows" do
+      it "returns whether a path is absolute" do
+        stub_const("RUBY_PLATFORM", "mingw")
+        expect(Rscons.absolute_path?("/foo")).to be_truthy
+        expect(Rscons.absolute_path?("\\Windows")).to be_truthy
+        expect(Rscons.absolute_path?("C:\\Windows")).to be_truthy
+        expect(Rscons.absolute_path?("f:\\stuff")).to be_truthy
+        expect(Rscons.absolute_path?("g:/projects")).to be_truthy
+        expect(Rscons.absolute_path?("x:foo")).to be_falsey
+        expect(Rscons.absolute_path?("file.txt")).to be_falsey
+      end
+    end
+
+    context "not on Windows" do
+      it "returns whether a path is absolute" do
+        stub_const("RUBY_PLATFORM", "linux")
+        expect(Rscons.absolute_path?("/foo")).to be_truthy
+        expect(Rscons.absolute_path?("\\Windows")).to be_falsey
+        expect(Rscons.absolute_path?("C:\\Windows")).to be_falsey
+        expect(Rscons.absolute_path?("f:\\stuff")).to be_falsey
+        expect(Rscons.absolute_path?("g:/projects")).to be_falsey
+        expect(Rscons.absolute_path?("x:foo")).to be_falsey
+        expect(Rscons.absolute_path?("file.txt")).to be_falsey
+      end
+    end
+  end
+
   describe ".set_suffix" do
     it "changes the suffix to the new one" do
       expect(Rscons.set_suffix("foo.c", ".h")).to eq("foo.h")