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https://bitbucket.org/icl/papi/pull-requests/406
From 3d09c90d892c845473ba92bb1e9ff0ead4f3eb84 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 28 Nov 2022 08:44:38 +0100
Subject: [PATCH] configure: Avoid implicit ints and implicit function
declarations
Implicit ints and implicit function declarations were removed from
the C language in 1999. Relying on them can cause spurious autoconf
check failures with compilers that do not support them in the default
language mode.
--- a/configure.in
+++ b/configure.in
@@ -577,14 +577,16 @@ fi
AC_MSG_CHECKING(for working gettid)
AC_LINK_IFELSE([AC_LANG_SOURCE([#include <sys/types.h>
- main() { pid_t a = gettid(); }])],
+ #include <unistd.h>
+ int main() { pid_t a = gettid(); }])],
[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_GETTID, 1, [Full gettid function])],
[AC_MSG_RESULT(no)
AC_MSG_CHECKING(for working syscall(SYS_gettid))
AC_LINK_IFELSE([AC_LANG_SOURCE([#include <sys/types.h>
#include <sys/syscall.h>
- main() { pid_t a = syscall(SYS_gettid); }])],
+ #include <unistd.h>
+ int main() { pid_t a = syscall(SYS_gettid); }])],
[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SYSCALL_GETTID, 1, [gettid syscall function])],
[AC_MSG_RESULT(no)]) ])
@@ -625,7 +627,7 @@ AC_ARG_WITH(walltimer,
#include <stdio.h>
#include <time.h>
#include <syscall.h>
- main() {
+ int main() {
struct timespec t1, t2;
double seconds;
if (syscall(__NR_clock_gettime,CLOCK_REALTIME_HR,&t1) == -1) exit(1);
@@ -646,7 +648,7 @@ AC_ARG_WITH(walltimer,
#include <stdio.h>
#include <time.h>
#include <syscall.h>
- main() {
+ int main() {
struct timespec t1, t2;
double seconds;
if (syscall(__NR_clock_gettime,CLOCK_REALTIME,&t1) == -1) exit(1);
--
2.38.1
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