more reliable NI/NU definitions

compiler/cgen.nim

@@ -800,20 +800,9 @@ proc genVarPrototype(m: BModule, sym: PSym) =
   if sfExportc in sym.flags and generatedHeader != nil:
     genVarPrototypeAux(generatedHeader, sym)
 
-proc addIntTypes(result: var PRope) =
+proc addIntTypes(result: var PRope) {.inline.} =
-  case platform.CPU[targetCPU].intSize
+  appf(result, "#define NIM_INTBITS $1", [
-  of 16:
+    platform.CPU[targetCPU].intSize.toRope])
-    appff(result, 
-          "$ntypedef short int NI;$n" & "typedef unsigned short int NU;$n", 
-          "$n%NI = type i16$n", [])
-  of 32: 
-    appff(result, 
-          "$ntypedef long int NI;$n" & "typedef unsigned long int NU;$n", 
-          "$n%NI = type i32$n", [])
-  of 64: 
-    appff(result, "$ntypedef long long int NI;$n" &
-        "typedef unsigned long long int NU;$n", "$n%NI = type i64$n", [])
-  else: nil
 
 proc getCopyright(cfilenoext: string): PRope = 
   if optCompileOnly in gGlobalOptions: 

lib/nimbase.h

@@ -337,6 +337,24 @@ typedef long long int NI64;
 typedef unsigned int NU32;
 #endif
 
+#ifdef NIM_INTBITS
+#  if NIM_INTBITS == 64
+typedef NI64 NI;
+typedef NU64 NU;
+#  elif NIM_INTBITS == 32
+typedef NI32 NI;
+typedef NU32 NU;
+#  elif NIM_INTBITS == 16
+typedef NI16 NI;
+typedef NU16 NU;
+#  elif NIM_INTBITS == 8
+typedef NI8 NI;
+typedef NU8 NU;
+#  else
+#    error "invalid bit width for int"
+#  endif
+#endif
+
 extern NI nim_program_result;
 
 typedef float NF32;