Add -cflags switch for DMD.

diff --git a/src/link.c b/src/link.c
index 5d41fb0..a538dda 100644
--- a/src/link.c
+++ b/src/link.c
@@ -340,6 +340,11 @@ int runLINK()
         argv.push(p);
     }

+    for (size_t i = 0; i < global.params.ccswitches->dim; i++)
+    {   char *p = global.params.ccswitches->tdata()[i];
+        argv.push(p);
+    }
+
     /* Add each library, prefixing it with "-l".
      * The order of libraries passed is:
      *  1. any libraries passed with -L command line switch
diff --git a/src/mars.c b/src/mars.c
index d680124..da73663 100644
--- a/src/mars.c
+++ b/src/mars.c
@@ -278,8 +278,11 @@ Usage:\n\
   files.d        D source files\n\
   @cmdfile       read arguments from cmdfile\n\
   -c             do not link\n\
-  -cov           do code coverage analysis\n\
-  -D             generate documentation\n\
+  -cov           do code coverage analysis\n"
+#if linux || __APPLE__ || __FreeBSD__ || __OpenBSD__ || __sun&&__SVR4
+"  -cflag=ccflag  pass ccflag to the C compiler/linker driver\n"
+#endif
+"  -D             generate documentation\n\
   -Dddocdir      write documentation file to docdir directory\n\
   -Dffilename    write documentation file to filename\n\
   -d             allow deprecated features\n\
@@ -398,6 +401,7 @@ int main(int argc, char *argv[])
     global.params.quiet = 1;

     global.params.linkswitches = new Strings();
+    global.params.ccswitches = new Strings();
     global.params.libfiles = new Strings();
     global.params.objfiles = new Strings();
     global.params.ddocfiles = new Strings();
@@ -733,6 +737,12 @@ int main(int argc, char *argv[])
             {
                 global.params.linkswitches->push(p + 2);
             }
+#if linux || __APPLE__ || __FreeBSD__ || __OpenBSD__ || __sun&&__SVR4
+            else if (memcmp(p + 1, "cflag=", 6) == 0)
+	    {
+		global.params.ccswitches->push(p + 1 + 6);
+	    }
+#endif
             else if (memcmp(p + 1, "defaultlib=", 11) == 0)
             {
                 global.params.defaultlibname = p + 1 + 11;
diff --git a/src/mars.h b/src/mars.h
index 3b44269..66409c9 100644
--- a/src/mars.h
+++ b/src/mars.h
@@ -230,6 +230,7 @@ struct Param
     // Linker stuff
     Strings *objfiles;
     Strings *linkswitches;
+    Strings *ccswitches;
     Strings *libfiles;
     char *deffile;
     char *resfile;