From 6f0afb842c733034bf36b553059270321b38c856 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 21 Sep 2018 09:40:56 +0200
Subject: configure: force-use -lpthreads on HPUX

When trying to detect pthreads use on HPUX the checks will succeed
without the correct -l option but then end up failing at run-time.

Reported-by: Eason-Yu on github
Fixes #2697
Closes #3025
---
 configure.ac | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/configure.ac b/configure.ac
index fdfd0897c..85b8b1465 100755
--- a/configure.ac
+++ b/configure.ac
@@ -3897,6 +3897,16 @@ if test "$want_pthreads" != "no"; then
       dnl first check for function without lib
       AC_CHECK_FUNC(pthread_create, [USE_THREADS_POSIX=1] )
 
+      dnl on HPUX, life is more complicated...
+      case $host in
+      *-hp-hpux*)
+         dnl it doesn't actually work without -lpthread
+         USE_THREADS_POSIX=""
+         ;;
+      *)
+         ;;
+      esac
+
       dnl if it wasn't found without lib, search for it in pthread lib
       if test "$USE_THREADS_POSIX" != "1"
       then
-- 
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