better error message when C compilation fails

compiler/extccomp.nim

@@ -1,7 +1,7 @@
 #
 #
 #           The Nimrod Compiler
-#        (c) Copyright 2012 Andreas Rumpf
+#        (c) Copyright 2013 Andreas Rumpf
 #
 #    See the file "copying.txt", included in this
 #    distribution, for details about the copyright.
@@ -573,7 +573,12 @@ proc CallCCompiler*(projectfile: string) =
     else: 
       res = execProcesses(cmds, {poUseShell, poParentStreams}, 
                           gNumberOfProcessors)
-    if res != 0: rawMessage(errExecutionOfProgramFailed, [])
+    if res != 0:
+      if gNumberOfProcessors <= 1:
+        rawMessage(errExecutionOfProgramFailed, [])
+      else:
+        rawMessage(errGenerated, " execution of an external program failed; " &
+                   "rerun with --parallelBuild:1 to see the error message")
   if optNoLinking notin gGlobalOptions:
     # call the linker:
     var it = PStrEntry(toLink.head)

tests/manyloc/gbemulator/cpu.nim

@@ -132,6 +132,7 @@ proc exec(cpu: PCPU) =
   let opcode = cpu.mem.readByte(cpu.r.pc)
   #echo("OPCODE: 0x", toHex(opcode, 2))
   cpu.r.pc.inc()
+  # PROBLEM: 0x7B is part of some range later but the compiler does not care!
   case opcode
   of 0x06:
     # LD B, n

todo.txt

@@ -13,6 +13,7 @@ version 0.9.2
 - acyclic vs prunable; introduce GC hints
 - CGEN: ``restrict`` pragma + backend support; computed goto support
 - document NimMain and check whether it works for threading
+- implement ``system.locals`` magic iterator
 
 
 Bugs
@@ -31,6 +32,7 @@ Bugs
   in c++ mode)
 - bootstrapping does not work in C++ mode
 - case statement exhaustiveness checking is still wrong
+- the new m&s GC is still buggy
 
 
 version 0.9.4