configure.ac: fix autoreconf warnings

configure.ac:804: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from...
configure.ac:804: the top level

diff --git a/configure.ac b/configure.ac
index 5ab5f0d78b4a7a508f1fadaef4cb4c7f3634fbc8..eb5d17b5bbb31f9f1f4b82b0346a827686417eeb 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -800,12 +800,14 @@ AC_CHECK_FUNCS(gettimeofday select strdup strtol getaddrinfo getnameinfo strchr
 AC_FUNC_STRERROR_R
 
 test_cxx_flags() {
-       AC_LANG_PUSH(C++)
-       AC_LANG_CONFTEST([int main(void){}])
+       AC_LANG_PUSH([C++])
+       AC_LANG_CONFTEST([
+               AC_LANG_SOURCE([[int main(void){}]])
+       ])
        $CXX -c conftest.cpp $CXXFLAGS $@ > /dev/null 2> /dev/null
        ret=$?
        rm -f conftest.o
-       AC_LANG_POP(C++)
+       AC_LANG_POP([C++])
        return $ret
 }