Account for filename collisions on systems with case-insensitive file…

… systems

modules/gmake2/tests/test_gmake2_objects.lua

@@ -156,6 +156,71 @@ OBJECTS += $(OBJDIR)/hello111.o
 else ifeq ($(config),release)
 OBJECTS += $(OBJDIR)/hello1.o
 
+else
+  $(error "invalid configuration $(config)")
+endif
+
+		]]
+	end
+
+--
+-- Test that changes in case are treated as if multiple files of the same name are being built
+--
+
+	function suite.uniqueObjNames_ignoreCase1()
+		files { "a/hello.cpp", "b/Hello.cpp" }
+		prepare()
+		test.capture [[
+# File sets
+# #############################################
+
+OBJECTS :=
+
+OBJECTS += $(OBJDIR)/Hello1.o
+OBJECTS += $(OBJDIR)/hello.o
+
+		]]
+	end
+
+	function suite.uniqueObjNames_ignoreCase2()
+		files { "a/hello.cpp", "b/hello.cpp", "c/Hello1.cpp" }
+		prepare()
+		test.capture [[
+# File sets
+# #############################################
+
+OBJECTS :=
+
+OBJECTS += $(OBJDIR)/Hello11.o
+OBJECTS += $(OBJDIR)/hello.o
+OBJECTS += $(OBJDIR)/hello1.o
+
+		]]
+	end
+
+	function suite.uniqueObjectNames_ignoreCase_Release()
+		files { "a/hello.cpp", "b/hello.cpp", "c/Hello1.cpp", "d/Hello11.cpp" }
+		filter "configurations:Debug"
+			excludes {"b/hello.cpp"}
+		filter "configurations:Release"
+			excludes {"d/Hello11.cpp"}
+
+		prepare()
+		test.capture [[
+# File sets
+# #############################################
+
+OBJECTS :=
+
+OBJECTS += $(OBJDIR)/Hello11.o
+OBJECTS += $(OBJDIR)/hello.o
+
+ifeq ($(config),debug)
+OBJECTS += $(OBJDIR)/Hello111.o
+
+else ifeq ($(config),release)
+OBJECTS += $(OBJDIR)/hello1.o
+
 else
   $(error "invalid configuration $(config)")
 endif

modules/vstudio/tests/vc2010/test_files.lua

@@ -479,6 +479,82 @@
 		]]
 	end
 
+--
+-- Test that changes in case are treated as if multiple files of the same name are being built
+--
+
+	function suite.uniqueObjectNames_onSourceNameCollision_ignoreCase()
+		files { "hello.cpp", "greetings/Hello.cpp" }
+		prepare()
+		test.capture [[
+<ItemGroup>
+	<ClCompile Include="greetings\Hello.cpp" />
+	<ClCompile Include="hello.cpp">
+		<ObjectFileName>$(IntDir)\hello1.obj</ObjectFileName>
+	</ClCompile>
+</ItemGroup>
+		]]
+	end
+
+
+	function suite.uniqueObjectNames_onBaseNameCollision_ignoreCase1()
+		files { "a/hello.cpp", "b/Hello.cpp", "c/hello1.cpp" }
+		prepare()
+		test.capture [[
+<ItemGroup>
+	<ClCompile Include="a\hello.cpp" />
+	<ClCompile Include="b\Hello.cpp">
+		<ObjectFileName>$(IntDir)\Hello1.obj</ObjectFileName>
+	</ClCompile>
+	<ClCompile Include="c\hello1.cpp">
+		<ObjectFileName>$(IntDir)\hello11.obj</ObjectFileName>
+	</ClCompile>
+</ItemGroup>
+		]]
+	end
+
+
+	function suite.uniqueObjectNames_onBaseNameCollision_ignoreCase2()
+		files { "a/hello1.cpp", "b/Hello.cpp", "c/hello.cpp" }
+		prepare()
+		test.capture [[
+<ItemGroup>
+	<ClCompile Include="a\hello1.cpp" />
+	<ClCompile Include="b\Hello.cpp" />
+	<ClCompile Include="c\hello.cpp">
+		<ObjectFileName>$(IntDir)\hello2.obj</ObjectFileName>
+	</ClCompile>
+</ItemGroup>
+		]]
+	end
+
+
+	function suite.uniqueObjectNames_onBaseNameCollision_Release_ignoreCase()
+		files { "a/Hello.cpp", "b/hello.cpp", "c/hello1.cpp", "d/hello11.cpp" }
+		filter "configurations:Debug"
+			excludes {"b/hello.cpp"}
+		filter "configurations:Release"
+			excludes {"d/hello11.cpp"}
+
+		prepare()
+		test.capture [[
+<ItemGroup>
+	<ClCompile Include="a\Hello.cpp" />
+	<ClCompile Include="b\hello.cpp">
+		<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+		<ObjectFileName Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(IntDir)\hello1.obj</ObjectFileName>
+	</ClCompile>
+	<ClCompile Include="c\hello1.cpp">
+		<ObjectFileName Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(IntDir)\hello11.obj</ObjectFileName>
+	</ClCompile>
+	<ClCompile Include="d\hello11.cpp">
+		<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
+	</ClCompile>
+</ItemGroup>
+		]]
+	end
+
+
 
 --
 -- Check handling of per-file forced includes.

src/base/oven.lua

@@ -695,23 +695,40 @@
 -- conflicting object file names - hello1.o
 
 	function oven.uniqueSequence(f, cfg, seq, bases)
-		while true do
+		local good_sequence = true
+		repeat
+			-- be optimistic
+			good_sequence = true
 			f.sequence = seq[cfg] or 0
 			seq[cfg] = f.sequence + 1
 
-			if seq[cfg] == 1 then
+			if f.sequence == 0 then
+				-- first time seeing this objname
 				break
 			end
 
-			if not bases[f.objname] then
-				bases[f.objname] = {}
+			-- getting here has changed our sequence number, but this new "basename"
+			-- may still collide with files that actually end with this "sequence number"
+			-- so we have to check the bases table now
+
+			-- objname changes with the sequence number on every loop
+			local lowerobj = f.objname:lower()
+			if not bases[lowerobj] then
+				-- this is the first appearance of a file that produces this objname
+				-- intialize the table for any future basename that matches our objname
+				bases[lowerobj] = {}
 			end
 
-			if not bases[f.objname][cfg] then
-				bases[f.objname][cfg] = 1
-				break
+			if not bases[lowerobj][cfg] then
+				-- not a collision
+				-- start a sequence for a future basename that matches our objname for this cfg
+				bases[lowerobj][cfg] = 1
+				good_sequence = true
+			else
+				-- is truly a collision, try the next sequence number
+				good_sequence = false
 			end
-		end
+		until good_sequence
 	end
 
 
@@ -732,12 +749,12 @@
 			-- For each base file name encountered, keep a count of the number of
 			-- collisions that have occurred for each project configuration. Use
 			-- this collision count to generate the unique object file names.
-
-			if not bases[file.basename] then
-				bases[file.basename] = {}
+			local lowerbase = file.basename:lower()
+			if not bases[lowerbase] then
+				bases[lowerbase] = {}
 			end
 
-			local sequences = bases[file.basename]
+			local sequences = bases[lowerbase]
 
 			for cfg in p.project.eachconfig(prj) do
 				local fcfg = p.fileconfig.getconfig(file, cfg)