distinguish between 'defined' and 'declared'

compiler/condsyms.nim

@@ -19,6 +19,9 @@ var gSymbols: PStringTable
 proc defineSymbol*(symbol: string) = 
   gSymbols[symbol] = "true"
 
+proc declareSymbol*(symbol: string) = 
+  gSymbols[symbol] = "unknown"
+
 proc undefSymbol*(symbol: string) = 
   gSymbols[symbol] = "false"
 
@@ -27,6 +30,7 @@ proc isDefined*(symbol: string): bool =
     result = gSymbols[symbol] == "true"
   
 proc isDefined*(symbol: PIdent): bool = isDefined(symbol.s)
+proc isDeclared*(symbol: PIdent): bool = gSymbols.hasKey(symbol.s)
 
 iterator definedSymbolNames*: string =
   for key, val in pairs(gSymbols):
@@ -37,6 +41,36 @@ proc countDefinedSymbols*(): int =
   for key, val in pairs(gSymbols):
     if val == "true": inc(result)
 
+# For ease of bootstrapping, we keep there here and not in the global config
+# file for now:
+const
+  additionalSymbols = """
+    x86 itanium x8664
+    msdos mswindows win32 unix posix sunos bsd macintosh RISCOS doslike hpux
+    mac
+
+    hppa hp9000 hp9000s300 hp9000s700 hp9000s800 hp9000s820 ELATE sparcv9
+
+    ecmascript js nimrodvm nimffi nimdoc cpp objc
+    gcc llvmgcc clang lcc bcc dmc wcc vcc tcc pcc ucc icl
+    boehmgc gcmarkandsweep gcgenerational nogc gcUseBitvectors
+    endb profiler
+    executable guiapp consoleapp library dll staticlib
+
+    quick nimbabel
+    release debug
+    useWinAnsi useFork useNimRtl useMalloc useRealtimeGC ssl memProfiler
+    nodejs kwin
+
+    usesysassert usegcassert tinyC useFFI
+    useStdoutAsStdmsg createNimRtl
+    booting fulldebug corruption nimsuperops noSignalHandler useGnuReadline
+    noCaas noDocGen noBusyWaiting nativeStackTrace useNodeIds selftest
+    reportMissedDeadlines avoidTimeMachine useClone ignoreAllocationSize
+    debugExecProcesses pcreDll useLipzipSrc
+    preventDeadlocks UNICODE winUnicode trackGcHeaders posixRealtime
+  """.split
+
 proc initDefines*() = 
   gSymbols = newStringTable(modeStyleInsensitive)
   defineSymbol("nimrod") # 'nimrod' is always defined
@@ -53,6 +87,17 @@ proc initDefines*() =
   defineSymbol("nimparsebiggestfloatmagic")
   
   # add platform specific symbols:
+  for c in low(CPU)..high(CPU):
+    declareSymbol("cpu" & $CPU[c].bit)
+    declareSymbol(normalize(EndianToStr[CPU[c].endian]))
+    declareSymbol(CPU[c].name)
+  for o in low(platform.OS)..high(platform.OS):
+    declareSymbol(platform.OS[o].name)
+
+  for a in additionalSymbols:
+    declareSymbol(a)
+
+  # -----------------------------------------------------------
   case targetCPU
   of cpuI386: defineSymbol("x86")
   of cpuIa64: defineSymbol("itanium")
@@ -88,5 +133,6 @@ proc initDefines*() =
   defineSymbol(normalize(EndianToStr[CPU[targetCPU].endian]))
   defineSymbol(CPU[targetCPU].name)
   defineSymbol(platform.OS[targetOS].name)
+  declareSymbol("emulatedthreadvars")
   if platform.OS[targetOS].props.contains(ospLacksThreadVars):
     defineSymbol("emulatedthreadvars")