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 doChar(void)36doChar (void) 37 { 38 return 0; 39 } 40 41 static int doInt(void)42doInt (void) 43 { 44 return 0; 45 } 46 47 static off_t doOff(void)48doOff (void) 49 { 50 return 0; 51 } 52 53 static void * doPtr(void)54doPtr (void) 55 { 56 return NULL; 57 } 58 59 static struct s doStruct(void)60doStruct (void) 61 { 62 static struct s s1; 63 return s1; 64 } 65 66 int main(void)67main (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 } 79