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.

diff --git a/configure.ac b/configure.ac
index a1f2823a199145a01c4016ed8b31710ee5157b2b..7cc0dfd9ec6df3c69dc73d41c260e5b5dde431ca 100644 (file)
--- 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])