Add --help option.

From-SVN: r21109

1 files changed, 79 insertions, 1 deletions

diff --git a/gcc/cccp.c b/gcc/cccp.c
index d717009..1bd7649 100644
--- a/gcc/cccp.c
+++ b/gcc/cccp.c
@@ -1047,6 +1047,7 @@ GENERIC_PTR xmalloc PROTO((size_t));
 static GENERIC_PTR xrealloc PROTO((GENERIC_PTR, size_t));
 static GENERIC_PTR xcalloc PROTO((size_t, size_t));
 static char *savestring PROTO((char *));
+static void print_help PROTO((void));
 
 /* Read LEN bytes at PTR from descriptor DESC, for file FILENAME,
    retrying if necessary.  If MAX_READ_LEN is defined, read at most
@@ -1146,6 +1147,73 @@ eprint_string (string, length)
 }
 
 
+static void
+print_help ()
+{
+  printf ("Usage: %s [switches] input output\n", progname);
+  printf ("Switches:\n");
+  printf ("  -include <file>           Include the contents of <file> before other files\n");
+  printf ("  -imacros <file>           Accept definition of marcos in <file>\n");
+  printf ("  -iprefix <path>           Specify <path> as a prefix for next two options\n");
+  printf ("  -iwithprefix <dir>        Add <dir> to the end of the system include paths\n");
+  printf ("  -iwithprefixbefore <dir>  Add <dir> to the end of the main include paths\n");
+  printf ("  -isystem <dir>            Add <dir> to the start of the system include paths\n");
+  printf ("  -idirafter <dir>          Add <dir> to the end of the system include paths\n");
+  printf ("  -I <dir>                  Add <dir> to the end of the main include paths\n");
+  printf ("  -nostdinc                 Do not search the system include directories\n");
+  printf ("  -nostdinc++               Do not search the system include directories for C++\n");
+  printf ("  -o <file>                 Put output into <file>\n");
+  printf ("  -pedantic                 Issue all warnings demanded by strict ANSI C\n");
+  printf ("  -traditional              Follow K&R pre-processor behaviour\n");
+  printf ("  -trigraphs                Support ANSI C trigraphs\n");
+  printf ("  -lang-c                   Assume that the input sources are in C\n");
+  printf ("  -lang-c89                 Assume that the input sources are in C89\n");
+  printf ("  -lang-c++                 Assume that the input sources are in C++\n");
+  printf ("  -lang-objc                Assume that the input sources are in ObjectiveC\n");
+  printf ("  -lang-objc++              Assume that the input sources are in ObjectiveC++\n");
+  printf ("  -lang-asm                 Assume that the input sources are in assembler\n");
+  printf ("  -lang-chill               Assume that the input sources are in Chill\n");
+  printf ("  -+                        Allow parsing of C++ style features\n");
+  printf ("  -w                        Inhibit warning messages\n");
+  printf ("  -Wtrigraphs               Warn if trigraphs are encountered\n");
+  printf ("  -Wno-trigraphs            Do not warn about trigraphs\n");
+  printf ("  -Wcomment{s}              Warn if one comment starts inside another\n");
+  printf ("  -Wno-comment{s}           Do not warn about comments\n");
+  printf ("  -Wtraditional             Warn if a macro argument is/would be turned into\n");
+  printf ("                             a string if -tradtional is specified\n");
+  printf ("  -Wno-traditional          Do not warn about stringification\n");
+  printf ("  -Wundef                   Warn if an undefined macro is used by #if\n");
+  printf ("  -Wno-undef                Do not warn about testing udefined macros\n");
+  printf ("  -Wimport                  Warn about the use of the #import directive\n");
+  printf ("  -Wno-import               Do not warn about the use of #import\n");
+  printf ("  -Werror                   Treat all warnings as errors\n");
+  printf ("  -Wno-error                Do not treat warnings as errors\n");
+  printf ("  -Wall                     Enable all preprocessor warnings\n");
+  printf ("  -M                        Generate make dependencies\n");
+  printf ("  -MM                       As -M, but ignore system header files\n");
+  printf ("  -MD                       As -M, but put output in a .d file\n");
+  printf ("  -MMD                      As -MD, but ignore system header files\n");
+  printf ("  -MG                       Treat missing header file as generated files\n");
+  printf ("  -g                        Include #define and #undef directives in the output\n");
+  printf ("  -D<macro>                 Define a <macro> with string '1' as its value\n");
+  printf ("  -D<macro>=<val>           Define a <macro> with <val> as its value\n");
+  printf ("  -A<question> (<answer>)   Assert the <answer> to <question>\n");
+  printf ("  -U<macro>                 Undefine <macro> \n");
+  printf ("  -u or -undef              Do not predefine any macros\n");
+  printf ("  -v                        Display the version number\n");
+  printf ("  -H                        Print the name of header files as they are used\n");
+  printf ("  -C                        Do not discard comments\n");
+  printf ("  -dM                       Display a list of macro definitions active at end\n");
+  printf ("  -dD                       Preserve macro definitions in output\n");
+  printf ("  -dN                       As -dD except that only the names are preserved\n");
+  printf ("  -dI                       Include #include directives in the output\n");
+  printf ("  -ifoutput                 Describe skipped code blocks in output \n");
+  printf ("  -P                        Do not generate #line directives\n");
+  printf ("  -$                        Do not include '$' in identifiers\n");
+  printf ("  -remap                    Remap file names when including files.\n");
+  printf ("  -h or --help              Display this information\n");
+}
+
 int
 main (argc, argv)
      int argc;
@@ -1245,7 +1313,10 @@ main (argc, argv)
   for (i = 1; i < argc; i++) {
     if (argv[i][0] != '-') {
       if (out_fname != NULL)
-	fatal ("Usage: %s [switches] input output", argv[0]);
+	{
+	  print_help ();
+	  fatal ("Too many arguments");
+	}
       else if (in_fname != NULL)
 	out_fname = argv[i];
       else
@@ -1525,6 +1596,13 @@ main (argc, argv)
 	  debug_output = 1;
 	break;
 
+      case '-':
+	if (strcmp (argv[i], "--help") != 0)
+	  return i;
+	print_help ();
+	exit (0);
+	break;
+
       case 'v':
 	fprintf (stderr, "GNU CPP version %s", version_string);
 #ifdef TARGET_VERSION