Initial revision

git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@13320 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 227 insertions, 0 deletions

diff --git a/gcc/cp/g++spec.c b/gcc/cp/g++spec.c
new file mode 100644
index 00000000000..881e8213b1d
--- /dev/null
+++ b/gcc/cp/g++spec.c
@@ -0,0 +1,227 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include "gansidecl.h"
+
+/* This bit is set if we saw a `-xfoo' language specification.  */
+#define LANGSPEC	(1<<1)
+/* This bit is set if they did `-lm' or `-lmath'.  */
+#define MATHLIB		(1<<2)
+/* This bit is set if they did `-lc'.  */
+#define WITHLIBC	(1<<3)
+
+#ifndef MATH_LIBRARY
+#define MATH_LIBRARY "-lm"
+#endif
+
+extern char *xmalloc PROTO((size_t));
+
+void
+lang_specific_driver (fn, in_argc, in_argv)
+     void (*fn)();
+     int *in_argc;
+     char ***in_argv;
+{
+  int i, j;
+
+  /* If non-zero, the user gave us the `-v' flag.  */ 
+  int saw_verbose_flag = 0;
+
+  /* This will be 0 if we encounter a situation where we should not
+     link in libstdc++.  */
+  int library = 1;
+
+  /* The number of arguments being added to what's in argv, other than
+     libraries.  We use this to track the number of times we've inserted
+     -xc++/-xnone.  */
+  int added = 2;
+
+  /* Used to track options that take arguments, so we don't go wrapping
+     those with -xc++/-xnone.  */
+  char *quote = NULL;
+
+  /* The new argument list will be contained in this.  */
+  char **arglist;
+
+  /* Non-zero if we saw a `-xfoo' language specification on the
+     command line.  Used to avoid adding our own -xc++ if the user
+     already gave a language for the file.  */
+  int saw_speclang = 0;
+
+  /* "-lm" or "-lmath" if it appears on the command line.  */
+  char *saw_math = 0;
+
+  /* "-lc" if it appears on the command line.  */
+  char *saw_libc = 0;
+
+  /* An array used to flag each argument that needs a bit set for
+     LANGSPEC, MATHLIB, or WITHLIBC.  */
+  int *args;
+
+  /* By default, we throw on the math library.  */
+  int need_math = 1;
+
+  /* The total number of arguments with the new stuff.  */
+  int argc;
+
+  /* The argument list.  */
+  char **argv;
+
+  /* The total number of arguments with the new stuff.  */
+  int num_args = 1;
+
+  argc = *in_argc;
+  argv = *in_argv;
+
+
+  args = (int *) xmalloc (argc * sizeof (int));
+  bzero ((char *) args, argc * sizeof (int));
+
+  /* NOTE: We start at 0 now, not 1.  */
+  for (i = 0; i < argc; i++)
+    {
+      /* If the previous option took an argument, we swallow it here.  */
+      if (quote)
+	{
+	  quote = NULL;
+	  continue;
+	}
+
+      /* We don't do this anymore, since we don't get them with minus
+	 signs on them.  */
+      if (argv[i][0] == '\0' || argv[i][1] == '\0')
+	continue;
+
+      if (argv[i][0] == '-')
+	{
+	  if (library != 0 && (strcmp (argv[i], "nostdlib") == 0
+			       || strcmp (argv[i], "nodefaultlibs") == 0))
+	    {
+	      library = 0;
+	    }
+	  else if (strcmp (argv[i], "lm") == 0
+		   || strcmp (argv[i], "lmath") == 0
+#ifdef ALT_LIBM
+		   || strcmp (argv[i], ALT_LIBM) == 0
+#endif
+		  )
+	    {
+	      args[i] |= MATHLIB;
+	      need_math = 0;
+	    }
+	  else if (strcmp (argv[i], "lc") == 0)
+	    args[i] |= WITHLIBC;
+	  else if (strcmp (argv[i], "v") == 0)
+	    {
+	      saw_verbose_flag = 1;
+	      /* We now see if this is 1, since we are doing the switches
+		 differently.  */
+	      if (argc == 1)
+		{
+		  /* If they only gave us `-v', don't try to link
+		     in libg++.  */ 
+		  library = 0;
+		}
+	    }
+	  else if (strncmp (argv[i], "x", 2) == 0)
+	    saw_speclang = 1;
+	  else if (((argv[i][2] == '\0'
+		     && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
+		    || strcmp (argv[i], "Tdata") == 0))
+	    quote = argv[i];
+	  else if (library != 0 && ((argv[i][2] == '\0'
+		     && (char *) strchr ("cSEM", argv[i][1]) != NULL)
+		    || strcmp (argv[i], "MM") == 0))
+	    {
+	      /* Don't specify libraries if we won't link, since that would
+		 cause a warning.  */
+	      library = 0;
+	      added -= 2;
+	    }
+	  else
+	    /* Pass other options through.  */
+	    continue;
+	}
+      else
+	{
+	  int len; 
+
+	  if (saw_speclang)
+	    {
+	      saw_speclang = 0;
+	      continue;
+	    }
+
+	  /* If the filename ends in .c or .i, put options around it.
+	     But not if a specified -x option is currently active.  */
+	  len = strlen (argv[i]);
+	  if (len > 2
+	      && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
+	      && argv[i][len - 2] == '.')
+	    {
+	      args[i] |= LANGSPEC;
+	      added += 2;
+	    }
+	}
+    }
+
+  if (quote)
+    (*fn) ("argument to `%s' missing\n", quote);
+
+  /* If we know we don't have to do anything, bail now.  */
+  if (! added && ! library)
+    {
+      free (args);
+      return;
+    }
+
+  num_args = argc + added + need_math;
+  arglist = (char **) xmalloc (num_args * sizeof (char *));
+
+  /* NOTE: We start at 1 now, not 0.  */
+  for (i = 0, j = 0; i < argc; i++, j++)
+    {
+      arglist[j] = argv[i];
+
+      /* Make sure -lstdc++ is before the math library, since libstdc++
+	 itself uses those math routines.  */
+      if (!saw_math && (args[i] & MATHLIB) && library)
+	{
+	  --j;
+	  saw_math = argv[i];
+	}
+
+      if (!saw_libc && (args[i] & WITHLIBC) && library)
+	{
+	  --j;
+	  saw_libc = argv[i];
+	}
+
+      /* Wrap foo.c and foo.i files in a language specification to
+	 force the gcc compiler driver to run cc1plus on them.  */
+      if (args[i] & LANGSPEC)
+	{
+	  int len = strlen (argv[i]);
+	  if (argv[i][len - 1] == 'i')
+	    arglist[j++] = "-xc++-cpp-output";
+	  else
+	    arglist[j++] = "-xc++";
+	  arglist[j++] = argv[i];
+	  arglist[j] = "-xnone";
+	}
+  }
+
+  /* Add `-lstdc++' if we haven't already done so.  */
+  if (library)
+    arglist[j++] = "-lstdc++";
+  if (saw_math)
+    arglist[j++] = saw_math;
+  else if (library)
+    arglist[j++] = MATH_LIBRARY;
+  if (saw_libc)
+    arglist[j++] = saw_libc;
+
+  arglist[j] = NULL;
+
+  *in_argc = j;
+  *in_argv = arglist;
+}