cmake: add ENABLE_THREADED_RESOLVER, rename ARES

Fix detection of the AsynchDNS feature which not just depends on
pthreads support, but also on whether USE_POSIX_THREADS is set or not.
Caught by test 1014.

This patch adds a new ENABLE_THREADED_RESOLVER option (corresponding to
--enable-threaded-resolver of autotools) which also needs a check for
HAVE_PTHREAD_H.

For symmetry with autotools, CURL_USE_ARES is renamed to ENABLE_ARES
(--enable-ares). Checks that test for the availability actually use
USE_ARES instead as that is the result of whether a-res is available or
not (in practice this does not matter as CARES is marked as required
package, but nevertheless it is better to write the intent).

Signed-off-by: Peter Wu <peter@lekensteyn.nl>

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index 32bae39bf..44014f5dd 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -467,6 +467,9 @@
 /* Define to 1 if you have a working POSIX-style strerror_r function. */
 #cmakedefine HAVE_POSIX_STRERROR_R 1
 
+/* Define to 1 if you have the <pthread.h> header file */
+#cmakedefine HAVE_PTHREAD_H 1
+
 /* Define to 1 if you have the <pwd.h> header file. */
 #cmakedefine HAVE_PWD_H 1
 
@@ -879,6 +882,9 @@
 /* Define if you want to enable c-ares support */
 #cmakedefine USE_ARES 1
 
+/* Define if you want to enable POSIX threaded DNS lookup */
+#cmakedefine USE_THREADS_POSIX 1
+
 /* Define to disable non-blocking sockets. */
 #cmakedefine USE_BLOCKING_SOCKETS 1