gcc.c (print_sysroot): New.

        * gcc.c (print_sysroot): New.
        (option_map, display_help, process_command): Handle the
        -print-sysroot option.
        (main): Print the sysroot if requested.
        * doc/invoke.texi (Debugging Options): Document -print-sysroot.

From-SVN: r137584

gcc/ChangeLog

+2008-07-07  Vladimir Prus  <vladimir@codesourcery.com>
+
+	* gcc.c (print_sysroot): New.
+	(option_map, display_help, process_command): Handle the
+	-print-sysroot option.
+	(main): Print the sysroot if requested.
+	* doc/invoke.texi (Debugging Options): Document -print-sysroot.
+	
 2008-07-07  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	PR target/34780

gcc/doc/invoke.texi

@@ -310,7 +310,7 @@ Objective-C and Objective-C++ Dialects}.
 -p  -pg  -print-file-name=@var{library}  -print-libgcc-file-name @gol
 -print-multi-directory  -print-multi-lib @gol
 -print-prog-name=@var{program}  -print-search-dirs  -Q @gol
--print-sysroot-headers-suffix @gol
+-print-sysroot -print-sysroot-headers-suffix @gol
 -save-temps  -time}
 
 @item Optimization Options
@@ -5059,6 +5059,14 @@ variable @env{GCC_EXEC_PREFIX} to the directory where you installed them.
 Don't forget the trailing @samp{/}.
 @xref{Environment Variables}.
 
+@item -print-sysroot
+@opindex print-sysroot
+Print the target sysroot directory that will be used during
+compilation.  This is the target sysroot specified either at configure
+time or or using the @option{--sysroot} option, possibly with an extra
+suffix that depends on compilation options.  If no target sysroot is
+specified, the option prints nothing.
+
 @item -print-sysroot-headers-suffix
 @opindex print-sysroot-headers-suffix
 Print the suffix added to the target sysroot when searching for

gcc/gcc.c

@@ -155,6 +155,8 @@ static const char *print_prog_name = NULL;
 
 static int print_multi_directory;
 
+static int print_sysroot;
+
 /* Flag saying to print the relative path we'd use to
    find OS libraries given the current compiler flags.  */
 
@@ -1162,6 +1164,7 @@ static const struct option_map option_map[] =
    {"--print-multi-directory", "-print-multi-directory", 0},
    {"--print-multi-os-directory", "-print-multi-os-directory", 0},
    {"--print-prog-name", "-print-prog-name=", "aj"},
+   {"--print-sysroot", "-print-sysroot", 0},
    {"--print-sysroot-headers-suffix", "-print-sysroot-headers-suffix", 0},
    {"--profile", "-p", 0},
    {"--profile-blocks", "-a", 0},
@@ -3244,6 +3247,7 @@ display_help (void)
   -print-multi-lib         Display the mapping between command line options and\n\
                            multiple library search directories\n"), stdout);
   fputs (_("  -print-multi-os-directory Display the relative path to OS libraries\n"), stdout);
+  fputs (_("  -print-sysroot           Display the target libraries directory\n"), stdout);
   fputs (_("  -print-sysroot-headers-suffix Display the sysroot suffix used to find headers\n"), stdout);
   fputs (_("  -Wa,<options>            Pass comma-separated <options> on to the assembler\n"), stdout);
   fputs (_("  -Wp,<options>            Pass comma-separated <options> on to the preprocessor\n"), stdout);
@@ -3686,6 +3690,8 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
 	print_multi_lib = 1;
       else if (! strcmp (argv[i], "-print-multi-directory"))
 	print_multi_directory = 1;
+      else if (! strcmp (argv[i], "-print-sysroot"))
+	print_sysroot = 1;
       else if (! strcmp (argv[i], "-print-multi-os-directory"))
 	print_multi_os_directory = 1;
       else if (! strcmp (argv[i], "-print-sysroot-headers-suffix"))
@@ -4126,6 +4132,8 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
 	;
       else if (! strcmp (argv[i], "-print-multi-directory"))
 	;
+      else if (! strcmp (argv[i], "-print-sysroot"))
+	;
       else if (! strcmp (argv[i], "-print-multi-os-directory"))
 	;
       else if (! strcmp (argv[i], "-print-sysroot-headers-suffix"))
@@ -6529,6 +6537,18 @@ main (int argc, char **argv)
       return (0);
     }
 
+  if (print_sysroot)
+    {
+      if (target_system_root)
+	{
+          if (target_sysroot_suffix)
+	    printf ("%s%s\n", target_system_root, target_sysroot_suffix);
+          else
+	    printf ("%s\n", target_system_root);
+	}
+      return (0);
+    }
+
   if (print_multi_os_directory)
     {
       if (multilib_os_dir == NULL)