From 3660d23158441075dec8e3c08fb513225ec10210 Mon Sep 17 00:00:00 2001
From: Per Hedeland <per@tail-f.com>
Date: Wed, 14 Nov 2012 15:10:21 +0100
Subject: Teach erl_interface configure more pthread support

- Teach lib/erl_interface/configure.in to look for
  pthreads support in libc (where it can be found on QNX)

- A minor tweak such that this configure *fails* if you pass --enable-threads and
  no pthreads support can be found.
---
 lib/erl_interface/configure.in | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'lib/erl_interface/configure.in')

diff --git a/lib/erl_interface/configure.in b/lib/erl_interface/configure.in
index c958f80065..f1c9ebbb6f 100644
--- a/lib/erl_interface/configure.in
+++ b/lib/erl_interface/configure.in
@@ -79,7 +79,7 @@ AC_ARG_ENABLE(threads,
     no) threads_disabled=yes ;;
     *)  threads_disabled=no ;;
   esac ],
-[ threads_disabled=no ])
+[ threads_disabled=maybe ])
 
 dnl ----------------------------------------------------------------------
 dnl Checks for programs
@@ -237,12 +237,16 @@ AC_SUBST(THR_DEFS)
 AC_SUBST(EI_THREADS)
 
 case "$threads_disabled" in
-    no)
+    no|maybe)
 	LM_CHECK_THR_LIB
 
 	case "$THR_LIB_NAME" in
 	    "")
 	        EI_THREADS="false"
+		# Fail if --enable-threads given and no threads found
+		if test "x$threads_disabled" = "xno"; then
+		    AC_MSG_ERROR(No threads support found)
+		fi
 	        ;;
 	    win32_threads)
 		EI_THREADS="true"	
-- 
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