gcc.c (wrapper_string): New variable.

2008-04-30  Seongbae Park  <seongbae.park@gmail.com>

	* gcc.c (wrapper_string): New variable.
	(insert_wrapper): New function.
	(execute): New option -wrapper.
	* doc/invoke.texi (Overall Options): New driver option -wrapper.

From-SVN: r134832

gcc/ChangeLog

+2008-04-30  Seongbae Park  <seongbae.park@gmail.com>
+
+	* gcc.c (wrapper_string): New variable.
+	(insert_wrapper): New function.
+	(execute): New option -wrapper.
+	* doc/invoke.texi (Overall Options): New driver option -wrapper.
+
 2008-04-30  Nathan Froyd  <froydnj@codesourcery.com>
 
         * config/rs6000/crtresgpr.asm, config/rs6000/crtresxgpr.asm,

gcc/doc/invoke.texi

@@ -164,7 +164,7 @@ in the following sections.
 @xref{Overall Options,,Options Controlling the Kind of Output}.
 @gccoptlist{-c  -S  -E  -o @var{file}  -combine  -pipe  -pass-exit-codes  @gol
 -x @var{language}  -v  -###  --help@r{[}=@var{class}@r{]}  --target-help  @gol
---version @@@var{file}}
+--version -wrapper@@@var{file}}
 
 @item C Language Options
 @xref{C Dialect Options,,Options Controlling C Dialect}.
@@ -1251,6 +1251,19 @@ diff /tmp/O2-opts /tmp/O3-opts | grep enabled
 @opindex version
 Display the version number and copyrights of the invoked GCC@.
 
+@item -wrapper
+@opindex wrapper
+Invoke all subcommands under a wrapper program. It takes a single
+comma separated list as an argument, which will be used to invoke
+the wrapper:
+
+@smallexample
+gcc -c t.c -wrapper gdb,--args
+@end smallexample
+
+This will invoke all subprograms of gcc under "gdb --args",
+thus cc1 invocation will be "gdb --args cc1 ...".
+
 @include @value{srcdir}/../libiberty/at-file.texi
 @end table
 

gcc/gcc.c

@@ -285,12 +285,21 @@ static struct obstack obstack;
 
 static struct obstack collect_obstack;
 
+/* This is a list of a wrapper program and its arguments.
+   e.g. wrapper_string of "strace,-c"
+   will cause all programs to run as
+       strace -c program arguments
+   instead of just
+       program arguments */
+static const char  *wrapper_string;
+
 /* Forward declaration for prototypes.  */
 struct path_prefix;
 struct prefix_list;
 
 static void init_spec (void);
 static void store_arg (const char *, int, int);
+static void insert_wrapper (const char *);
 static char *load_specs (const char *);
 static void read_specs (const char *, int);
 static void set_spec (const char *, const char *);
@@ -2845,6 +2854,13 @@ execute (void)
 
   gcc_assert (!processing_spec_function);
 
+  if (wrapper_string)
+    {
+      string = find_a_file (&exec_prefixes, argbuf[0], X_OK, false);
+      argbuf[0] = (string) ? string : argbuf[0];
+      insert_wrapper (wrapper_string);
+    }
+
   /* Count # of piped commands.  */
   for (n_commands = 1, i = 0; i < argbuf_index; i++)
     if (strcmp (argbuf[i], "|") == 0)
@@ -2859,10 +2875,12 @@ execute (void)
 
   commands[0].prog = argbuf[0]; /* first command.  */
   commands[0].argv = &argbuf[0];
-  string = find_a_file (&exec_prefixes, commands[0].prog, X_OK, false);
-
-  if (string)
-    commands[0].argv[0] = string;
+ 
+  if (!wrapper_string)
+    {
+      string = find_a_file (&exec_prefixes, commands[0].prog, X_OK, false);
+      commands[0].argv[0] = (string) ? string : commands[0].argv[0];
+    }
 
   for (n_commands = 1, i = 0; i < argbuf_index; i++)
     if (strcmp (argbuf[i], "|") == 0)
@@ -3798,6 +3816,15 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
 	  use_pipes = 1;
 	  n_switches++;
 	}
+      else if (strcmp (argv[i], "-wrapper") == 0)
+        {
+	  if (++i >= argc)
+	    fatal ("argument to '-wrapper' is missing");
+
+          wrapper_string = argv[i];
+	  n_switches++;
+	  n_switches++;
+        }
       else if (strcmp (argv[i], "-###") == 0)
 	{
 	  /* This is similar to -v except that there is no execution
@@ -4163,6 +4190,8 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
 	  infiles[n_infiles].language = "*";
 	  infiles[n_infiles++].name = argv[i];
 	}
+      else if (strcmp (argv[i], "-wrapper") == 0)
+        i++;
       else if (strcmp (argv[i], "-specs") == 0)
 	i++;
       else if (strncmp (argv[i], "-specs=", 7) == 0)
@@ -4414,6 +4443,52 @@ end_going_arg (void)
     }
 }
 
+
+/* Parse the WRAPPER string which is a comma separated list of the command line
+   and insert them into the beginning of argbuf.  */
+
+static void
+insert_wrapper (const char *wrapper)
+{
+  int n = 0;
+  int i;
+  char *buf = xstrdup (wrapper);
+  char *p = buf;
+
+  do
+    {
+      n++;
+      while (*p == ',')
+        p++;
+    }
+  while ((p = strchr (p, ',')) != NULL);
+
+  if (argbuf_index + n >= argbuf_length)
+    {
+      argbuf_length = argbuf_length * 2;
+      while (argbuf_length < argbuf_index + n)
+	argbuf_length *= 2;
+      argbuf = xrealloc (argbuf, argbuf_length * sizeof (const char *));
+    }
+  for (i = argbuf_index - 1; i >= 0; i--)
+    argbuf[i + n] = argbuf[i];
+
+  i = 0;
+  p = buf;
+  do
+    {
+      while (*p == ',')
+        {
+          *p = 0;
+          p++;
+        }
+      argbuf[i++] = p;
+    }
+  while ((p = strchr (p, ',')) != NULL);
+  gcc_assert (i == n);
+  argbuf_index += n;
+}
+
 /* Process the spec SPEC and run the commands specified therein.
    Returns 0 if the spec is successfully processed; -1 if failed.  */