handling of compiler procs improved for DLL generation

lib/system/inclrtl.nim

@@ -0,0 +1,45 @@
+#
+#
+#            Nimrod's Runtime Library
+#        (c) Copyright 2010 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Pragmas for RTL generation. Has to be an include, because user-defined
+## pragmas cannot be exported.
+
+# There are 3 different usages:
+# 1) Ordinary imported code.
+# 2) Imported from nimrtl.
+#    -> defined(useNimRtl) or appType == "lib" and not defined(createNimRtl)
+# 3) Exported into nimrtl.
+#    -> appType == "lib" and defined(createNimRtl)
+
+when defined(createNimRtl):
+  when defined(useNimRtl): 
+    {.error: "Cannot create and use nimrtl at the same time!".}
+  elif appType != "lib":
+    {.error: "nimrtl must be build as a library!".}
+
+when defined(createNimRtl): 
+  # NOTE: compilerproc cannot make use of name mangling!
+  {.pragma: rtl, exportc: "nimrtl_$1", dynlib.}
+  {.pragma: inl.}
+  {.pragma: compilerRtl, compilerproc, exportc: "nimrtl_$1", dynlib.}
+elif defined(useNimRtl):
+  when hostOS == "windows": 
+    const nimrtl* = "nimrtl.dll"
+  elif hostOS == "macosx":
+    const nimrtl* = "nimrtl.dynlib"
+  else: 
+    const nimrtl* = "libnimrtl.so"
+  {.pragma: rtl, importc: "nimrtl_$1", dynlib: nimrtl.}
+  {.pragma: inl.}
+  {.pragma: compilerRtl, compilerproc, importc: "nimrtl_$1", dynlib: nimrtl.}
+else:
+  {.pragma: rtl.}
+  {.pragma: inl, inline.}
+  {.pragma: compilerRtl, compilerproc.}
+