Use libuv CFLAGS and LIBS when checking for features

When autoconf was checking for libuv features, the LIBUV_CFLAGS was not
added to CFLAGS and LIBUV_LIBS to LIBS which resulted in false
negatives.

Use AX_SAVE_FLAGS and AX_RESTORE_FLAGS to temporarily add LIBUV_CFLAGS
and LIBUV_LIBS to their respective variables.

diff --git a/configure.ac b/configure.ac
index 8dc5aca4c427469a0d6ae96293d91a0c96d51886..84108c9820c8e4fc275abb875837b62148280234 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -557,6 +557,10 @@ AC_MSG_CHECKING([for libuv])
 PKG_CHECK_MODULES([LIBUV], [libuv >= 1.0.0], [],
                  [AC_MSG_ERROR([libuv not found])])
 
+AX_SAVE_FLAGS([libuv])
+CFLAGS="$CFLAGS $LIBUV_CFLAGS"
+LIBS="$LIBS $LIBUV_LIBS"
+
 # libuv recvmmsg support
 AC_CHECK_DECLS([UV_UDP_MMSG_FREE, UV_UDP_MMSG_CHUNK], [], [], [[#include <uv.h>]])
 AC_MSG_CHECKING([whether struct msghdr uses padding for alignment])
@@ -571,6 +575,8 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/socket.h>],
 # libuv recverr support
 AC_CHECK_DECLS([UV_UDP_LINUX_RECVERR], [], [], [[#include <uv.h>]])
 
+AX_RESTORE_FLAGS([libuv])
+
 # [pairwise: --enable-doh --with-libnghttp2=auto, --enable-doh --with-libnghttp2=yes, --disable-doh]
 AC_ARG_ENABLE([doh],
              [AS_HELP_STRING([--disable-doh], [enable DNS over HTTPS, requires libnghttp2 (default=yes)])],