From ca2e8b3b19c3453420e6e56d271e22221b2e9cdd Mon Sep 17 00:00:00 2001
From: Luca Boccassi <luca.boccassi@gmail.com>
Date: Sat, 4 May 2019 15:05:09 +0100
Subject: [PATCH] Problem: build broken on Fedora 30

Solution: use AC_COMPILE_IFELSE instead of AC_CHECK_FUNCS to check for
strnlen, as the latter does not work anymore.
---
 configure.ac | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 94a9f4a0..f36bb8c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -675,9 +675,23 @@ AC_LANG_POP([C++])
 
 # Checks for library functions.
 AC_TYPE_SIGNAL
-AC_CHECK_FUNCS(perror gettimeofday clock_gettime memset socket getifaddrs freeifaddrs fork mkdtemp accept4 strnlen)
+AC_CHECK_FUNCS(perror gettimeofday clock_gettime memset socket getifaddrs freeifaddrs fork mkdtemp accept4)
 AC_CHECK_HEADERS([alloca.h])
 
+# string.h doesn't seem to be included by default in Fedora 30
+AC_MSG_CHECKING([whether strnlen is available])
+AC_COMPILE_IFELSE(
+	[AC_LANG_PROGRAM(
+		[[#include <string.h>]],
+		[[size_t bar = strnlen ("foo", 1); (void)bar; return 0;]])
+	],[
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_STRNLEN, [1],
+		    [strnlen is available])
+	],[
+		AC_MSG_RESULT([no])
+])
+
 # pthread_setname is non-posix, and there are at least 4 different implementations
 AC_MSG_CHECKING([whether signature of pthread_setname_np() has 1 argument])
 AC_COMPILE_IFELSE(