Fix #1599

Compiler-specific options are now read with the '{compiler}.cpp' prefix in C++ mode.
 GCC C++ mode is fixed.

compiler/extccomp.nim

@@ -7,8 +7,10 @@
 #    distribution, for details about the copyright.
 #
 
-# module for calling the different external C compilers
+# Module providing functions for calling the different external C compilers
-# some things are read in from the configuration file
+# Uses some hard-wired facts about each C/C++ compiler, plus options read
+# from a configuration file, to provide generalized procedures to compile
+# nim files.
 
 import
   lists, ropes, os, strutils, osproc, platform, condsyms, options, msgs, crc
@@ -59,6 +61,7 @@ type
 template compiler(name: expr, settings: stmt): stmt {.immediate.} =
   proc name: TInfoCC {.compileTime.} = settings
 
+# GNU C and C++ Compiler
 compiler gcc:
   result = (
     name: "gcc",
@@ -84,21 +87,24 @@ compiler gcc:
     props: {hasSwitchRange, hasComputedGoto, hasCpp, hasGcGuard, hasGnuAsm,
             hasNakedAttribute})
 
+# LLVM Frontend for GCC/G++
 compiler llvmGcc:
-  result = gcc()
+  result = gcc() # Uses settings from GCC
-  
+
   result.name = "llvm_gcc"
   result.compilerExe = "llvm-gcc"
   result.cppCompiler = "llvm-g++"
   result.buildLib = "llvm-ar rcs $libfile $objfiles"
 
+# Clang (LLVM) C/C++ Compiler
 compiler clang:
-  result = llvmGcc()
+  result = llvmGcc() # Uses settings from llvmGcc
 
   result.name = "clang"
   result.compilerExe = "clang"
   result.cppCompiler = "clang++"
 
+# Microsoft Visual C/C++ Compiler
 compiler vcc:
   result = (
     name: "vcc",
@@ -123,6 +129,7 @@ compiler vcc:
     packedPragma: "#pragma pack(1)",
     props: {hasCpp, hasAssume, hasNakedDeclspec})
 
+# Intel C/C++ Compiler
 compiler icl:
   # Intel compilers try to imitate the native ones (gcc and msvc)
   when defined(windows):
@@ -134,6 +141,7 @@ compiler icl:
   result.compilerExe = "icl"
   result.linkerExe = "icl"
 
+# Local C Compiler
 compiler lcc:
   result = (
     name: "lcc",
@@ -158,6 +166,7 @@ compiler lcc:
     packedPragma: "", # XXX: not supported yet
     props: {})
 
+# Borland C Compiler
 compiler bcc:
   result = (
     name: "bcc",
@@ -182,6 +191,7 @@ compiler bcc:
     packedPragma: "", # XXX: not supported yet
     props: {hasCpp})
 
+# Digital Mars C Compiler
 compiler dmc:
   result = (
     name: "dmc",
@@ -206,6 +216,7 @@ compiler dmc:
     packedPragma: "#pragma pack(1)",
     props: {hasCpp})
 
+# Watcom C Compiler
 compiler wcc:
   result = (
     name: "wcc",
@@ -230,6 +241,7 @@ compiler wcc:
     packedPragma: "", # XXX: not supported yet
     props: {hasCpp})
 
+# Tiny C Compiler
 compiler tcc:
   result = (
     name: "tcc",
@@ -254,6 +266,7 @@ compiler tcc:
     packedPragma: "", # XXX: not supported yet
     props: {hasSwitchRange, hasComputedGoto})
 
+# Pelles C Compiler
 compiler pcc:
   # Pelles C
   result = (
@@ -279,6 +292,7 @@ compiler pcc:
     packedPragma: "", # XXX: not supported yet
     props: {})
 
+# Your C Compiler
 compiler ucc:
   result = (
     name: "ucc",
@@ -339,7 +353,9 @@ var
   compileOptions: string = ""
   ccompilerpath: string = ""
 
-proc nameToCC*(name: string): TSystemCC = 
+proc nameToCC*(name: string): TSystemCC =
+  ## Returns the kind of compiler referred to by `name`, or ccNone
+  ## if the name doesn't refer to any known compiler.
   for i in countup(succ(ccNone), high(TSystemCC)): 
     if cmpIgnoreStyle(name, CC[i].name) == 0: 
       return i
@@ -348,17 +364,18 @@ 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)
   if (platform.hostOS != targetOS or platform.hostCPU != targetCPU) and
       optCompileOnly notin gGlobalOptions:
     let fullCCname = platform.CPU[targetCPU].name & '.' & 
                      platform.OS[targetOS].name & '.' & 
-                     CC[c].name & suffix
+                     CC[c].name & fullSuffix
     result = getConfigVar(fullCCname)
     if result.len == 0:
       # not overriden for this cross compilation setting?
-      result = getConfigVar(CC[c].name & suffix)
+      result = getConfigVar(CC[c].name & fullSuffix)
   else:
-    result = getConfigVar(CC[c].name & suffix)
+    result = getConfigVar(CC[c].name & fullSuffix)
 
 proc setCC*(ccname: string) = 
   cCompiler = nameToCC(ccname)
@@ -482,7 +499,7 @@ proc getLinkOptions: string =
 
 proc needsExeExt(): bool {.inline.} =
   result = (optGenScript in gGlobalOptions and targetOS == osWindows) or
-                                       (platform.hostOS == osWindows)
+           (platform.hostOS == osWindows)
 
 proc getCompilerExe(compiler: TSystemCC): string =
   result = if gCmd == cmdCompileToCpp: CC[compiler].cppCompiler
@@ -539,6 +556,7 @@ proc getCompileCFileCmd*(cfilename: string, isExternal = false): string =
     "lib", quoteShell(libpath)])
 
 proc footprint(filename: string): TCrc32 =
+  # note, '><' further modifies a crc value with a string.
   result = crcFromFile(filename) ><
       platform.OS[targetOS].name ><
       platform.CPU[targetCPU].name ><

config/nim.cfg

@@ -71,7 +71,7 @@ hint[LineTooLong]=off
   @if not bsd:
     # -fopenmp
     gcc.options.linker = "-ldl"
-    gpp.options.linker = "-ldl"
+    gcc.cpp.options.linker = "-ldl"
     clang.options.linker = "-ldl"
     tcc.options.linker = "-ldl"
   @end
@@ -101,19 +101,19 @@ hint[LineTooLong]=off
   cc = clang
   tlsEmulation:on
   gcc.options.always = "-w -fasm-blocks"
-  gpp.options.always = "-w -fasm-blocks -fpermissive"
+  gcc.cpp.options.always = "-w -fasm-blocks -fpermissive"
 @else:
-  gcc.options.always = "-w"
+  gcc.options.always = "-w" 
-  gpp.options.always = "-w -fpermissive"
+  gcc.cpp.options.always = "-w -fpermissive"
 @end
 
 gcc.options.speed = "-O3 -fno-strict-aliasing"
 gcc.options.size = "-Os"
 gcc.options.debug = "-g3 -O0"
 
-gpp.options.speed = "-O3 -fno-strict-aliasing"
+gcc.cpp.options.speed = "-O3 -fno-strict-aliasing"
-gpp.options.size = "-Os"
+gcc.cpp.options.size = "-Os"
-gpp.options.debug = "-g3 -O0"
+gcc.cpp.options.debug = "-g3 -O0"
 #passl = "-pg"
 
 # Configuration for the LLVM GCC compiler: