https://github.com/icl-utk-edu/papi/commit/dd11311aadbd06ab6c76d49a997a8bb2bcdcd5f7
https://github.com/icl-utk-edu/papi/pull/142

From dd11311aadbd06ab6c76d49a997a8bb2bcdcd5f7 Mon Sep 17 00:00:00 2001
From: Giuseppe Congiu <gcongiu@icl.utk.edu>
Date: Fri, 29 Sep 2023 10:20:28 +0200
Subject: [PATCH] configure: fix tls detection

Configure TLS detection tests were failing because of wrong usage of
pthread_create(). Problem was caused by wrong definition of thread
functions which require void *f(void *) instead of int f(void *) or
void f(void *).
---
 configure.in | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/configure.in b/configure.in
index e77f1d017..346e3dab1 100644
--- a/configure.in
+++ b/configure.in
@@ -707,7 +707,7 @@ AC_ARG_WITH(tls,
                            #include <unistd.h>
                            extern __thread int i;
                            static int res1, res2;
-                           void thread_main (void *arg) {
+                           void *thread_main (void *arg) {
                              i = (int)arg;
                              sleep (1);
                              if ((int)arg == 1)
@@ -849,7 +849,7 @@ AC_ARG_WITH(virtualtimer,
                                        int gettid() {
                                          return syscall( SYS_gettid );
                                        } 
-                                       int doThreadOne( void * v ) {
+                                       void *doThreadOne( void * v ) {
                                          struct tms tm;
                                          int status;
                                          while (!done)
@@ -859,7 +859,7 @@ AC_ARG_WITH(virtualtimer,
                                          threadone = tm.tms_utime;
                                          return 0;
                                        }   
-                                       int doThreadTwo( void * v ) {
+                                       void *doThreadTwo( void * v ) {
                                          struct tms tm;
                                          long i, j = 0xdeadbeef;
                                          int status;

From 08f0d7dfaeb53283ab133e3b7d6f13d03245d88c Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 18 Dec 2023 08:18:50 +0100
Subject: [PATCH] configure: Fix return values in start thread routines

Thread start routines must return a void * value, and future
compilers refuse to convert integers to pointers with just a warning
(the virtualtimer probe).  Without this change, the probe always fails
to compile with future compilers (such as GCC 14).

For the tls probe, return a null pointer for future-proofing, although
current and upcoming C compilers do not treat this omission as an
error.

Updates commit dd11311aadbd06ab6c76d ("configure: fix tls detection").
---
 configure.in | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure.in b/configure.in
index 7d95ae1a4..f9b494036 100644
--- a/configure.in
+++ b/configure.in
@@ -721,6 +721,7 @@ AC_ARG_WITH(tls,
 		                       res1 = (i == (int)arg);
                              else
 		                       res2 = (i == (int)arg);
+		             return NULL;
                            }
 	                       __thread int i;
                            int main () {
@@ -812,7 +813,7 @@ AC_ARG_WITH(virtualtimer,
                                exit(1);
                              }        
                              done = 1;
-	                         return j;
+			     return (void *) j;
                            } 
   
                            int main( int argc, char ** argv ) {