Add an ArchUnknown constructor to the arch type

Fixes build problems on platforms for which we did not have
and Arch constructor.

compiler/nativeGen/AsmCodeGen.lhs

@@ -199,6 +199,8 @@ nativeCodeGen dflags h us cmms
                      }
                  ArchPPC_64 ->
                      panic "nativeCodeGen: No NCG for PPC 64"
+                 ArchUnknown ->
+                     panic "nativeCodeGen: No NCG for unknown arch"
 
 nativeCodeGen' :: (Instruction instr, Outputable instr)
                => DynFlags

compiler/nativeGen/TargetReg.hs

@@ -47,29 +47,32 @@ import qualified SPARC.Regs     as SPARC
 targetVirtualRegSqueeze :: RegClass -> VirtualReg -> FastInt
 targetVirtualRegSqueeze
     = case platformArch defaultTargetPlatform of
-      ArchX86    -> X86.virtualRegSqueeze
-      ArchX86_64 -> X86.virtualRegSqueeze
-      ArchPPC    -> PPC.virtualRegSqueeze
-      ArchSPARC  -> SPARC.virtualRegSqueeze
-      ArchPPC_64 -> panic "targetVirtualRegSqueeze ArchPPC_64"
+      ArchX86     -> X86.virtualRegSqueeze
+      ArchX86_64  -> X86.virtualRegSqueeze
+      ArchPPC     -> PPC.virtualRegSqueeze
+      ArchSPARC   -> SPARC.virtualRegSqueeze
+      ArchPPC_64  -> panic "targetVirtualRegSqueeze ArchPPC_64"
+      ArchUnknown -> panic "targetVirtualRegSqueeze ArchUnknown"
 
 targetRealRegSqueeze :: RegClass -> RealReg -> FastInt
 targetRealRegSqueeze
     = case platformArch defaultTargetPlatform of
-      ArchX86    -> X86.realRegSqueeze
-      ArchX86_64 -> X86.realRegSqueeze
-      ArchPPC    -> PPC.realRegSqueeze
-      ArchSPARC  -> SPARC.realRegSqueeze
-      ArchPPC_64 -> panic "targetRealRegSqueeze ArchPPC_64"
+      ArchX86     -> X86.realRegSqueeze
+      ArchX86_64  -> X86.realRegSqueeze
+      ArchPPC     -> PPC.realRegSqueeze
+      ArchSPARC   -> SPARC.realRegSqueeze
+      ArchPPC_64  -> panic "targetRealRegSqueeze ArchPPC_64"
+      ArchUnknown -> panic "targetRealRegSqueeze ArchUnknown"
 
 targetClassOfRealReg :: RealReg -> RegClass
 targetClassOfRealReg
     = case platformArch defaultTargetPlatform of
-      ArchX86    -> X86.classOfRealReg
-      ArchX86_64 -> X86.classOfRealReg
-      ArchPPC    -> PPC.classOfRealReg
-      ArchSPARC  -> SPARC.classOfRealReg
-      ArchPPC_64 -> panic "targetClassOfRealReg ArchPPC_64"
+      ArchX86     -> X86.classOfRealReg
+      ArchX86_64  -> X86.classOfRealReg
+      ArchPPC     -> PPC.classOfRealReg
+      ArchSPARC   -> SPARC.classOfRealReg
+      ArchPPC_64  -> panic "targetClassOfRealReg ArchPPC_64"
+      ArchUnknown -> panic "targetClassOfRealReg ArchUnknown"
 
 -- TODO: This should look at targetPlatform too
 targetWordSize :: Size
@@ -78,20 +81,22 @@ targetWordSize = intSize wordWidth
 targetMkVirtualReg :: Unique -> Size -> VirtualReg
 targetMkVirtualReg
     = case platformArch defaultTargetPlatform of
-      ArchX86    -> X86.mkVirtualReg
-      ArchX86_64 -> X86.mkVirtualReg
-      ArchPPC    -> PPC.mkVirtualReg
-      ArchSPARC  -> SPARC.mkVirtualReg
-      ArchPPC_64 -> panic "targetMkVirtualReg ArchPPC_64"
+      ArchX86     -> X86.mkVirtualReg
+      ArchX86_64  -> X86.mkVirtualReg
+      ArchPPC     -> PPC.mkVirtualReg
+      ArchSPARC   -> SPARC.mkVirtualReg
+      ArchPPC_64  -> panic "targetMkVirtualReg ArchPPC_64"
+      ArchUnknown -> panic "targetMkVirtualReg ArchUnknown"
 
 targetRegDotColor :: RealReg -> SDoc
 targetRegDotColor
     = case platformArch defaultTargetPlatform of
-      ArchX86    -> X86.regDotColor
-      ArchX86_64 -> X86.regDotColor
-      ArchPPC    -> PPC.regDotColor
-      ArchSPARC  -> SPARC.regDotColor
-      ArchPPC_64 -> panic "targetRegDotColor ArchPPC_64"
+      ArchX86     -> X86.regDotColor
+      ArchX86_64  -> X86.regDotColor
+      ArchPPC     -> PPC.regDotColor
+      ArchSPARC   -> SPARC.regDotColor
+      ArchPPC_64  -> panic "targetRegDotColor ArchPPC_64"
+      ArchUnknown -> panic "targetRegDotColor ArchUnknown"
 
 
 targetClassOfReg :: Reg -> RegClass

compiler/utils/Platform.hs

@@ -31,7 +31,8 @@ data Platform
 --	about what instruction set extensions an architecture might support.
 --
 data Arch
-	= ArchX86
+	= ArchUnknown
+	| ArchX86
 	| ArchX86_64
 	| ArchPPC
 	| ArchPPC_64
@@ -80,7 +81,7 @@ defaultTargetArch	= ArchPPC_64
 #elif sparc_TARGET_ARCH
 defaultTargetArch	= ArchSPARC
 #else
-#error	"Platform.buildArch: undefined"
+defaultTargetArch	= ArchUnknown
 #endif