* Added support for compiling Haiku with GCC 4. The main difference is that

we use the libstdc++ (including it's headers) that comes with the
  compiler.
* Apparently option "-I-" has been deprecated, which is why we now treat the
  include stuff a bit differently.
* Removed avcodec from the Haiku image, since the library wouldn't build with
  gcc 4, and I'm not in the mood to fix that (declaration of an array of an
  incomplete type).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14876 a95241bf-73f2-0310-859d-f6bbb57e9c96

build/jam/HelperRules

@@ -188,6 +188,50 @@ rule SetPlatformCompatibilityFlagVariables
 		?= $($(varPrefix)_PLATFORM_BEOS_COMPATIBLE) ;
 }
 
+rule FAnalyzeGCCVersion
+{
+	# FAnalyzeGCCVersion <rawVersionVariable> ;
+	#
+	local varName = $(1) ;
+	local rawVersion = $($(varName)) ;
+
+	if ! $(rawVersion) {
+		ECHO "Variable $(varName) not set. Please run ./configure or" ;
+		EXIT "specify it manually." ;
+	}
+
+	local version = ;
+	# split the raw version string at `.' and `-' characters
+	while $(rawVersion) {
+		local split = [ Match "([^.-]*)[.-](.*)" : $(rawVersion) ] ;
+		if $(split) {
+			version += $(split[1]) ;
+			rawVersion = $(split[2]) ;
+		} else {
+			version += $(rawVersion) ;
+			rawVersion = ;
+		}
+	}
+
+	return $(version) ;
+}
+
+rule SetIncludePropertiesVariables
+{
+	# SetIncludePropertiesVariables <varPrefix> ;
+	#
+	local prefix = $(1) ;
+	if $($(prefix)_GCC_VERSION[1]) < 4 {
+		$(prefix)_INCLUDES_SEPARATOR = -I- ;
+		$(prefix)_LOCAL_INCLUDES_OPTION = -I ;
+		$(prefix)_SYSTEM_INCLUDES_OPTION = -I ;
+	} else {
+		$(prefix)_INCLUDES_SEPARATOR = ;
+		$(prefix)_LOCAL_INCLUDES_OPTION = "-iquote " ;
+		$(prefix)_SYSTEM_INCLUDES_OPTION = "-idirafter " ;
+	}
+}
+
 
 #pragma mark -