[OE-core] [PATCH] curl: add 'enable-ares' packageconfig option

[Javier Viguera]

This build time option is needed to use the '--dns-interface' runtime
parameter to instruct 'curl' to use a specific interface for DNS
resolution.

Not enabled by default, as it depends on 'c-ares' package from
meta-openembedded (meta-networking).

Signed-off-by: Javier Viguera <javier.viguera at digi.com>
---
 meta/recipes-support/curl/curl_7.54.1.bb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/recipes-support/curl/curl_7.54.1.bb b/meta/recipes-support/curl/curl_7.54.1.bb
index 54f3b667c8a7..3a5f1ae7abfc 100644
--- a/meta/recipes-support/curl/curl_7.54.1.bb
+++ b/meta/recipes-support/curl/curl_7.54.1.bb
@@ -27,6 +27,8 @@ PACKAGECONFIG ??= "${@bb.utils.filter('DISTRO_FEATURES', 'ipv6', d)} gnutls prox
 PACKAGECONFIG_class-native = "ipv6 proxy ssl threaded-resolver zlib"
 PACKAGECONFIG_class-nativesdk = "ipv6 proxy ssl threaded-resolver zlib"
 
+# 'ares' and 'threaded-resolver' are mutually exclusive
+PACKAGECONFIG[ares] = "--enable-ares,--disable-ares,c-ares"
 PACKAGECONFIG[dict] = "--enable-dict,--disable-dict,"
 PACKAGECONFIG[gnutls] = "--with-gnutls,--without-gnutls,gnutls"
 PACKAGECONFIG[gopher] = "--enable-gopher,--disable-gopher,"