From 195ec8477565885e8f0975865a32bb716ea56272 Mon Sep 17 00:00:00 2001
From: Amos Jeffries <yadij@users.noreply.github.com>
Date: Tue, 19 Nov 2019 01:06:56 +1300
Subject: [PATCH] Fix detection of sys/sysctl.h detection (#511)

Make sure we test the EUI specific headers using same flags
chosen for final build operations. This should make the
test detect the header as unavailable if the user options
would make the compiler #warning be a fatal error later.
---
 configure.ac | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/configure.ac b/configure.ac
index a1f2823..7cc0dfd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1109,6 +1109,10 @@ AC_ARG_ENABLE(eui,
 SQUID_YESNO([$enableval],[--disable-eui expects no arguments])
 ])
 if test "x${enable_eui:=yes}" = "xyes" ; then
+  SQUID_STATE_SAVE(LIBEUI)
+  # GLIBC 2.30 deprecates sysctl.h. Test with the same flags that (may) break includes later.
+  CFLAGS=$SQUID_CFLAGS
+  CXXFLAGS=$SQUID_CXXFLAGS
   case "$squid_host_os" in
     linux|solaris|freebsd|openbsd|netbsd|cygwin)
       ${TRUE}
@@ -1148,6 +1152,7 @@ include <windows.h>
 #include <sys/param.h>
 #endif
   ]])
+  SQUID_STATE_ROLLBACK(LIBEUI)
 fi
 AC_SUBST(EUILIB)
 AC_MSG_NOTICE([EUI (MAC address) controls enabled: $enable_eui])
-- 
1.8.3.1