Fix unregisterised builds, and building on non-x86/amd64/powerpc

includes/Makefile

@@ -17,6 +17,10 @@ endif
 
 SRC_CC_OPTS += -I. -I../rts
 
+ifneq "$(GhcWithSMP)" "YES"
+SRC_CC_OPTS += -DNOSMP
+endif
+
 #
 # Header file built from the configure script's findings
 #

includes/Regs.h

@@ -333,7 +333,7 @@ struct PartCapability_ {
 /* No such thing as a MainCapability under THREADED_RTS - each thread must have
  * its own Capability.
  */
-#if IN_STG_CODE && !defined(THREADED_RTS)
+#if IN_STG_CODE && !(defined(THREADED_RTS) && !defined(NOSMP))
 extern W_ MainCapability[];
 #endif
 
@@ -349,7 +349,7 @@ extern W_ MainCapability[];
 GLOBAL_REG_DECL(StgRegTable *,BaseReg,REG_Base)
 #define ASSIGN_BaseReg(e) (BaseReg = (e))
 #else
-#ifdef THREADED_RTS
+#if defined(THREADED_RTS) && !defined(NOSMP)
 #error BaseReg must be in a register for THREADED_RTS
 #endif
 #define BaseReg (&((struct PartCapability_ *)MainCapability)->r)

includes/SMP.h

@@ -48,6 +48,9 @@ xchg(StgPtr p, StgWord w)
         :"=r" (result)
         :"r" (w), "r" (p)
     );
+#elif !defined(WITHSMP)
+    result = *p;
+    *p = w;
 #else
 #error xchg() unimplemented on this architecture
 #endif
@@ -81,6 +84,13 @@ cas(StgVolatilePtr p, StgWord o, StgWord n)
         :"cc", "memory"
     );
     return result;
+#elif !defined(WITHSMP)
+    StgWord result;
+    result = *p;
+    if (result == o) {
+        *p = n;
+    }
+    return result;
 #else
 #error cas() unimplemented on this architecture
 #endif
@@ -102,6 +112,8 @@ write_barrier(void) {
     __asm__ __volatile__ ("" : : : "memory");
 #elif powerpc_HOST_ARCH
     __asm__ __volatile__ ("lwsync" : : : "memory");
+#elif !defined(WITHSMP)
+    return;
 #else
 #error memory barriers unimplemented on this architecture
 #endif
@@ -117,7 +129,6 @@ write_barrier(void) {
 INLINE_HEADER StgInfoTable *
 lockClosure(StgClosure *p)
 {
-#if i386_HOST_ARCH || x86_64_HOST_ARCH || powerpc_HOST_ARCH
     StgWord info;
     do {
 	nat i = 0;
@@ -127,21 +138,14 @@ lockClosure(StgClosure *p)
 	} while (++i < SPIN_COUNT);
 	yieldThread();
     } while (1);
-#else
-   ACQUIRE_SM_LOCK
-#endif
 }
 
 INLINE_HEADER void
 unlockClosure(StgClosure *p, StgInfoTable *info)
 {
-#if i386_HOST_ARCH || x86_64_HOST_ARCH || powerpc_HOST_ARCH
     // This is a strictly ordered write, so we need a wb():
     write_barrier();
     p->header.info = info;
-#else
-    RELEASE_SM_LOCK;
-#endif
 }
 
 #else /* !THREADED_RTS */

mk/config.mk.in

@@ -257,6 +257,14 @@ GhcWithJavaGen=NO
 
 HaveLibDL = @HaveLibDL@
 
+ArchSupportsSMP=$(strip $(patsubst $(HostArch_CPP), YES, $(findstring $(HostArch_CPP), i386 x86_64)))
+
+ifeq "$(ArchSupportsSMP)" "YES"
+GhcWithSMP=YES
+else
+GhcWithSMP=NO
+endif
+
 # Whether to include GHCi in the compiler.  Depends on whether the RTS linker
 # has support for this OS/ARCH combination.
 

rts/Makefile

@@ -119,6 +119,11 @@ SRC_CC_OPTS += $(STANDARD_OPTS)
 SRC_CC_OPTS += $(GhcRtsCcOpts)
 SRC_HC_OPTS += $(GhcRtsHcOpts)
 
+ifneq "$(GhcWithSMP)" "YES"
+SRC_CC_OPTS += -DNOSMP
+SRC_HC_OPTS += -optc-DNOSMP
+endif
+
 ifneq "$(DLLized)" "YES"
 SRC_HC_OPTS += -static
 endif

rts/RtsFlags.c

@@ -418,7 +418,7 @@ usage_text[] = {
 "  -Dz  DEBUG: stack squezing",
 "",
 #endif /* DEBUG */
-#if defined(THREADED_RTS)
+#if defined(THREADED_RTS) && !defined(NOSMP)
 "  -N<n>     Use <n> OS threads (default: 1)",
 "  -qm       Don't automatically migrate threads between CPUs",
 "  -qw       Migrate a thread to the current CPU when it is woken up",
@@ -1019,7 +1019,7 @@ error = rtsTrue;
 		}
     	    	break;
 
-#ifdef THREADED_RTS
+#if defined(THREADED_RTS) && !defined(NOSMP)
 	      case 'N':
 		THREADED_BUILD_ONLY(
 		if (rts_argv[arg][2] != '\0') {

rts/StgCRun.c

@@ -85,11 +85,13 @@ register double fake_f9 __asm__("$f9");
 StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg STG_UNUSED)
 {
     while (f) {
+        /* XXX Disabled due to RtsFlags[]/RtsFlags mismatch
 	IF_DEBUG(interpreter,
 	    debugBelch("Jumping to ");
 	    printPtr((P_)f); fflush(stdout);
 	    debugBelch("\n");
 	    );
+        */
 	f = (StgFunPtr) (f)();
     }
     return (StgRegTable *)R1.p;