Introduced a sanity check for building hybrids. This will cause jam to error

when the user attempts to build an incorrectly configured hybrid.
For example a GCC 2  + GCC 2 system.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38949 a95241bf-73f2-0310-859d-f6bbb57e9c96

build/jam/AlternativeGCCArchive

@@ -2,6 +2,12 @@
 # the rules building the archive. Included by HaikuImage.
 
 
+#sanity check - make sure the primary gcc is different than the alternative gcc
+if $(HAIKU_PRIMARY_GCC) = $(HAIKU_GCC_VERSION[1]) {
+	Exit "Error: Your alternative gcc is the same as the main gcc!"
+		"You need to reconfigure your generated directories." ;
+}
+
 #pragma mark - Build The Archive
 
 

build/jam/HaikuImage

@@ -670,6 +670,7 @@ if $(HAIKU_ADD_ALTERNATIVE_GCC_LIBS) = 1
 		cd $(DIRECTORY)
 		export HAIKU_IGNORE_USER_BUILD_CONFIG=1
 		export HAIKU_ADD_OPTIONAL_PACKAGES=$(OPTIONAL_PACKAGES)
+		export HAIKU_PRIMARY_GCC=$(HAIKU_GCC_VERSION[1])
 		$(JAM:E=jam) -q $(COMMAND_LINE) ;
 	}