From 66e6adc138eef1367d7492fb79ae4da84ed62934 Mon Sep 17 00:00:00 2001
From: Neil Horman <nhorman@gmail.com>
Date: Thu, 15 Jul 2021 08:43:01 -0400
Subject: [PATCH] Adding ability to detect non-posix extensions for pthreads

Theres a desire to build rngd with musl, which doesn't have all the gnu
extensions (but it has some).  So test for those.  Note, this requires
the addition of the USE_EXTENSIONS macro to enable -d_GNU_SOURCE

Upstream-Status: Backport
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
---
 configure.ac | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index 9df633d..d0c2179 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,7 @@ AC_CANONICAL_TARGET dnl required for broken AX_PTHREAD
 AM_INIT_AUTOMAKE([foreign])
 AC_CONFIG_HEADERS([rng-tools-config.h])
 AC_CONFIG_MACRO_DIRS([m4])
+AC_USE_SYSTEM_EXTENSIONS
 
 dnl Parse options
 
@@ -100,6 +101,12 @@ AS_IF(
 	], [AC_MSG_NOTICE([Disabling JITTER entropy source])]
 )
 
+AC_CHECK_DECL(pthread_attr_setaffinity_np,
+		[AC_DEFINE([HAVE_PTHREAD_ATTR_SETAFFINITY], 1,[Set ATTR_SETAFFINITY])],
+		[ AC_CHECK_DECL(pthread_setaffinity_np,
+		   [AC_DEFINE([HAVE_PTHREAD_SETAFFINITY],1, [Set PTHREAD_SETAFFINITY])], [ AC_MSG_ERROR([Neither pthread_setaffinity_np nor pthread_attr_setaffinity_np found])],[[#include <pthread.h>]])
+		], [[#include <pthread.h>]])
+
 AS_IF(
 	[ test "x$with_nistbeacon" != "xno"],
 	[