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https://github.com/appneta/tcpreplay/pull/757
From 096197e584ebb7d646eef75e5a8654f7192a0af2 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 24 Nov 2022 07:30:28 +0100
Subject: [PATCH] configure.ac: Avoid implicit int, implicit function
declarations
Do not call exit without declaring it. Add #include <unistd.h>
for fork. Add missing int type to the definition of main.
Implicit ints and implicit function declarations were removed from
C in 1999 and will not be supported by future compilers.
--- a/configure.ac
+++ b/configure.ac
@@ -1681,8 +1681,8 @@ int
main (int argc, char *argv[])
{
if (strncmp(PCAPNAV_VERSION, PCAPNAV_TEST, 3) >= 0)
- exit(0);
- exit(1);
+ return 0;
+ return 1;
} ]])],[libpcapnav_ver=yes
AC_MSG_RESULT(>= 0.4)],[libpcapnav_ver=no
AC_MSG_RESULT(< 0.4)],[libpcapnav_ver=no
@@ -1726,26 +1726,27 @@ case "$host_os" in
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
+ #include <unistd.h>
unsigned char a[[5]] = { 1, 2, 3, 4, 5 };
- main() {
+ int main() {
unsigned int i;
pid_t pid;
int status;
/* avoid "core dumped" message */
pid = fork();
if (pid < 0)
- exit(2);
+ return 2;
if (pid > 0) {
/* parent */
pid = waitpid(pid, &status, 0);
if (pid < 0)
- exit(3);
- exit(!WIFEXITED(status));
+ return 3;
+ return !WIFEXITED(status);
}
/* child */
i = *(unsigned int *)&a[[1]];
printf("%d\n", i);
- exit(0);
+ return 0;
}
EOF
${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS \
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