Merge pull request #2342 from philip-wernersbach/more-improved-objc

Fix linking errors with basic Objective-C FFI.

compiler/extccomp.nim

@@ -363,7 +363,16 @@ proc nameToCC*(name: string): TSystemCC =
 proc getConfigVar(c: TSystemCC, suffix: string): string =
   # use ``cpu.os.cc`` for cross compilation, unless ``--compileOnly`` is given
   # for niminst support
-  let fullSuffix = (if gCmd == cmdCompileToCpp: ".cpp" & suffix else: suffix)
+  let fullSuffix =
+    if gCmd == cmdCompileToCpp:
+      ".cpp" & suffix
+    elif gCmd == cmdCompileToOC:
+      ".objc" & suffix
+    elif gCmd == cmdCompileToJS:
+      ".js" & suffix
+    else:
+      suffix
+
   if (platform.hostOS != targetOS or platform.hostCPU != targetCPU) and
       optCompileOnly notin gGlobalOptions:
     let fullCCname = platform.CPU[targetCPU].name & '.' & 

config/nim.cfg

@@ -112,6 +112,22 @@ path="$lib/pure/unidecode"
   gcc.cpp.options.always = "-w -fpermissive"
 @end
 
+# Configuration for Objective-C compiler:
+#
+# Options for GNUStep. GNUStep configuration varies wildly, so you'll probably
+# have to add additional compiler and linker flags on a per-project basis.
+gcc.objc.options.linker = "-lobjc -lgnustep-base"
+llvm_gcc.objc.options.linker = "-lobjc -lgnustep-base"
+clang.objc.options.linker = "-lobjc -lgnustep-base"
+
+# Options for Mac OS X. Mac OS X uses its own Objective-C stack that is
+# totally different from GNUStep.
+@if macosx:
+  gcc.objc.options.linker = "-framework Foundation"
+  llvm_gcc.objc.options.linker = "-framework Foundation"
+  clang.objc.options.linker = "-framework Foundation"
+@end
+
 # Configuration for the VxWorks
 # This has been tested with VxWorks 6.9 only
 @if vxworks: