tests/test-ignore-value.c

   1 /* Test the "ignore-value" module.
   2
   3    Copyright (C) 2011-2020 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Eric Blake.  */
  19
  20 #include <config.h>
  21
  22 #include "ignore-value.h"
  23
  24 #include <stdio.h>
  25
  26 #include "attribute.h"
  27
  28 struct s { int i; };
  29 static char doChar (void) NODISCARD;
  30 static int doInt (void) NODISCARD;
  31 static off_t doOff (void) NODISCARD;
  32 static void *doPtr (void) NODISCARD;
  33 static struct s doStruct (void) NODISCARD;
  34
  35 static char
  36 doChar (void)
  37 {
  38   return 0;
  39 }
  40
  41 static int
  42 doInt (void)
  43 {
  44   return 0;
  45 }
  46
  47 static off_t
  48 doOff (void)
  49 {
  50   return 0;
  51 }
  52
  53 static void *
  54 doPtr (void)
  55 {
  56   return NULL;
  57 }
  58
  59 static struct s
  60 doStruct (void)
  61 {
  62   static struct s s1;
  63   return s1;
  64 }
  65
  66 int
  67 main (void)
  68 {
  69   /* If this test can compile with -Werror and the same warnings as
  70      the rest of the project, then we are properly silencing warnings
  71      about ignored return values.  */
  72   ignore_value (doChar ());
  73   ignore_value (doInt ());
  74   ignore_value (doOff ());
  75   ignore_value (doPtr ());
  76   ignore_value (doStruct ());
  77   return 0;
  78 }