gcc/c/c-errors.c

   1 /* Various diagnostic subroutines for the GNU C language.
   2    Copyright (C) 2000-2020 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 C11 pedantic warning MSGID if -pedantic outside C2X mode,
  29    otherwise issue warning MSGID if -Wc11-c2X-compat is specified.
  30    This function is supposed to be used for matters that are allowed in
  31    ISO C2X but not supported in ISO C11, thus we explicitly don't pedwarn
  32    when C2X is specified.  */
  33
  34 bool
  35 pedwarn_c11 (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 C11/C2X compat warning, which is more specific
  44      than -pedantic.  */
  45   if (warn_c11_c2x_compat > 0)
  46     {
  47       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
  48                            (pedantic && !flag_isoc2x)
  49                            ? DK_PEDWARN : DK_WARNING);
  50       diagnostic.option_index = OPT_Wc11_c2x_compat;
  51       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
  52     }
  53   /* -Wno-c11-c2x-compat suppresses even the pedwarns.  */
  54   else if (warn_c11_c2x_compat == 0)
  55     ;
  56   /* For -pedantic outside C2X, issue a pedwarn.  */
  57   else if (pedantic && !flag_isoc2x)
  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 C99 pedantic warning MSGID if -pedantic outside C11 mode,
  68    otherwise issue warning MSGID if -Wc99-c11-compat is specified.
  69    This function is supposed to be used for matters that are allowed in
  70    ISO C11 but not supported in ISO C99, thus we explicitly don't pedwarn
  71    when C11 is specified.  */
  72
  73 bool
  74 pedwarn_c99 (location_t location, int opt, const char *gmsgid, ...)
  75 {
  76   diagnostic_info diagnostic;
  77   va_list ap;
  78   bool warned = false;
  79   rich_location richloc (line_table, location);
  80
  81   va_start (ap, gmsgid);
  82   /* If desired, issue the C99/C11 compat warning, which is more specific
  83      than -pedantic.  */
  84   if (warn_c99_c11_compat > 0)
  85     {
  86       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
  87                            (pedantic && !flag_isoc11)
  88                            ? DK_PEDWARN : DK_WARNING);
  89       diagnostic.option_index = OPT_Wc99_c11_compat;
  90       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
  91     }
  92   /* -Wno-c99-c11-compat suppresses even the pedwarns.  */
  93   else if (warn_c99_c11_compat == 0)
  94     ;
  95   /* For -pedantic outside C11, issue a pedwarn.  */
  96   else if (pedantic && !flag_isoc11)
  97     {
  98       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
  99       diagnostic.option_index = opt;
 100       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
 101     }
 102   va_end (ap);
 103   return warned;
 104 }
 105
 106 /* Issue an ISO C90 pedantic warning MSGID if -pedantic outside C99 mode,
 107    otherwise issue warning MSGID if -Wc90-c99-compat is specified, or if
 108    a specific option such as -Wlong-long is specified.
 109    This function is supposed to be used for matters that are allowed in
 110    ISO C99 but not supported in ISO C90, thus we explicitly don't pedwarn
 111    when C99 is specified.  (There is no flag_c90.)  */
 112
 113 bool
 114 pedwarn_c90 (location_t location, int opt, const char *gmsgid, ...)
 115 {
 116   diagnostic_info diagnostic;
 117   va_list ap;
 118   bool warned = false;
 119   rich_location richloc (line_table, location);
 120
 121   va_start (ap, gmsgid);
 122   /* Warnings such as -Wvla are the most specific ones.  */
 123   if (opt != OPT_Wpedantic)
 124     {
 125       int opt_var = *(int *) option_flag_var (opt, &global_options);
 126       if (opt_var == 0)
 127         goto out;
 128       else if (opt_var > 0)
 129         {
 130           diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
 131                                (pedantic && !flag_isoc99)
 132                                ? DK_PEDWARN : DK_WARNING);
 133           diagnostic.option_index = opt;
 134           diagnostic_report_diagnostic (global_dc, &diagnostic);
 135           warned = true;
 136           goto out;
 137         }
 138     }
 139   /* Maybe we want to issue the C90/C99 compat warning, which is more
 140      specific than -pedantic.  */
 141   if (warn_c90_c99_compat > 0)
 142     {
 143       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
 144                            (pedantic && !flag_isoc99)
 145                            ? DK_PEDWARN : DK_WARNING);
 146       diagnostic.option_index = OPT_Wc90_c99_compat;
 147       diagnostic_report_diagnostic (global_dc, &diagnostic);
 148     }
 149   /* -Wno-c90-c99-compat suppresses the pedwarns.  */
 150   else if (warn_c90_c99_compat == 0)
 151     ;
 152   /* For -pedantic outside C99, issue a pedwarn.  */
 153   else if (pedantic && !flag_isoc99)
 154     {
 155       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
 156       diagnostic.option_index = opt;
 157       diagnostic_report_diagnostic (global_dc, &diagnostic);
 158       warned = true;
 159     }
 160 out:
 161   va_end (ap);
 162   return warned;
 163 }