some make system work to get x86-64 linux compiles working:

-The biggest problem with linking host libraries (libbe_build and libroot_build) was not having the source files compiled with the -fPIC flag. As far as I can tell, we want to do this on all of the other host platforms as well, so hacked the jam files a bit to add it. 
Forgive me if I've committed more Jamfile sins.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21423 a95241bf-73f2-0310-859d-f6bbb57e9c96

build/jam/MainBuildRules

@@ -465,6 +465,10 @@ rule BuildPlatformSharedLibrary
 		LINKFLAGS on $(target) = [ on $(target) return $(LINKFLAGS) ]
 			-shared -Xlinker -soname=\"$(target:G=)\" ;
 	}
+
+    local objects = [ FGristFiles $(sources:S=$(SUFOBJ)) ] ;
+	CCFLAGS on $(objects) += $(HOST_PIC_CCFLAGS) ; 
+	C++FLAGS on $(objects) += $(HOST_PIC_C++FLAGS) ; 
 }
 
 rule BuildPlatformMergeObject
@@ -489,10 +493,32 @@ rule BuildPlatformMergeObject
 		# propagate the flag to the objects
 		USES_BE_API on $(objects) = $(usesBeAPI) ;
 	}
-	
+
 	MergeObject $(target) : $(sources) : $(otherObjects) ;
 }
 
+rule BuildPlatformMergeObjectPIC
+{
+	# BuildPlatformMergeObjectPIC <name> : <sources> : <other objects> ;
+	# Compiles source files and merges the object files to an object file.
+	# Same as BuildPlatformMergeObject rule but adds position-independent
+	# flags to the compiler (if any).
+	# <name>: Name of the object file to create. No grist will be added.
+	# <sources>: Sources to be compiled. Grist will be added.
+	# <other objects>: Object files or static libraries to be merged. No grist
+	#                  will be added.
+	#
+	local target = $(1) ;
+	local sources = $(2) ;
+	local otherObjects = $(3) ;
+
+	local objects = [ FGristFiles $(sources:S=$(SUFOBJ)) ] ;
+	CCFLAGS on $(objects) += $(HOST_PIC_CCFLAGS) ; 
+	C++FLAGS on $(objects) += $(HOST_PIC_C++FLAGS) ; 
+
+	BuildPlatformMergeObject $(target) : $(sources) : $(otherObjects) ;
+}
+
 rule BuildPlatformStaticLibrary
 {
 	# BuildPlatformStaticLibrary <lib> : <sources> ;