gcc/c/c-errors.c

   1 /* Various diagnostic subroutines for the GNU C language.
   2    Copyright (C) 2000-2018 Free Software Foundation, Inc.
   3    Contributed by Gabriel Dos Reis <gdr@codesourcery.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "c-tree.h"
  26 #include "opts.h"
  27
  28 /* Issue an ISO C99 pedantic warning MSGID if -pedantic outside C11 mode,
  29    otherwise issue warning MSGID if -Wc99-c11-compat is specified.
  30    This function is supposed to be used for matters that are allowed in
  31    ISO C11 but not supported in ISO C99, thus we explicitly don't pedwarn
  32    when C11 is specified.  */
  33
  34 bool
  35 pedwarn_c99 (location_t location, int opt, const char *gmsgid, ...)
  36 {
  37   diagnostic_info diagnostic;
  38   va_list ap;
  39   bool warned = false;
  40   rich_location richloc (line_table, location);
  41
  42   va_start (ap, gmsgid);
  43   /* If desired, issue the C99/C11 compat warning, which is more specific
  44      than -pedantic.  */
  45   if (warn_c99_c11_compat > 0)
  46     {
  47       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
  48                            (pedantic && !flag_isoc11)
  49                            ? DK_PEDWARN : DK_WARNING);
  50       diagnostic.option_index = OPT_Wc99_c11_compat;
  51       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
  52     }
  53   /* -Wno-c99-c11-compat suppresses even the pedwarns.  */
  54   else if (warn_c99_c11_compat == 0)
  55     ;
  56   /* For -pedantic outside C11, issue a pedwarn.  */
  57   else if (pedantic && !flag_isoc11)
  58     {
  59       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
  60       diagnostic.option_index = opt;
  61       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
  62     }
  63   va_end (ap);
  64   return warned;
  65 }
  66
  67 /* Issue an ISO C90 pedantic warning MSGID if -pedantic outside C99 mode,
  68    otherwise issue warning MSGID if -Wc90-c99-compat is specified, or if
  69    a specific option such as -Wlong-long is specified.
  70    This function is supposed to be used for matters that are allowed in
  71    ISO C99 but not supported in ISO C90, thus we explicitly don't pedwarn
  72    when C99 is specified.  (There is no flag_c90.)  */
  73
  74 bool
  75 pedwarn_c90 (location_t location, int opt, const char *gmsgid, ...)
  76 {
  77   diagnostic_info diagnostic;
  78   va_list ap;
  79   bool warned = false;
  80   rich_location richloc (line_table, location);
  81
  82   va_start (ap, gmsgid);
  83   /* Warnings such as -Wvla are the most specific ones.  */
  84   if (opt != OPT_Wpedantic)
  85     {
  86       int opt_var = *(int *) option_flag_var (opt, &global_options);
  87       if (opt_var == 0)
  88         goto out;
  89       else if (opt_var > 0)
  90         {
  91           diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
  92                                (pedantic && !flag_isoc99)
  93                                ? DK_PEDWARN : DK_WARNING);
  94           diagnostic.option_index = opt;
  95           diagnostic_report_diagnostic (global_dc, &diagnostic);
  96           warned = true;
  97           goto out;
  98         }
  99     }
 100   /* Maybe we want to issue the C90/C99 compat warning, which is more
 101      specific than -pedantic.  */
 102   if (warn_c90_c99_compat > 0)
 103     {
 104       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
 105                            (pedantic && !flag_isoc99)
 106                            ? DK_PEDWARN : DK_WARNING);
 107       diagnostic.option_index = OPT_Wc90_c99_compat;
 108       diagnostic_report_diagnostic (global_dc, &diagnostic);
 109     }
 110   /* -Wno-c90-c99-compat suppresses the pedwarns.  */
 111   else if (warn_c90_c99_compat == 0)
 112     ;
 113   /* For -pedantic outside C99, issue a pedwarn.  */
 114   else if (pedantic && !flag_isoc99)
 115     {
 116       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
 117       diagnostic.option_index = opt;
 118       diagnostic_report_diagnostic (global_dc, &diagnostic);
 119       warned = true;
 120     }
 121 out:
 122   va_end (ap);
 123   return warned;
 124 }