mysql: fix debugging options

The usual --{en,dis}able-debug passed by the infrastructure are not
recognised by mysql's ./configure, as it uses unusual options.

Also, debugging is only meaningful to the server, not the client.

Signed-off-by: Marcelo Gutierrez (UTN/FRH) <kuyurix@gmail.com>
[yann.morin.1998@free.fr: actually add the options, move in server if-block]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/mysql/mysql.mk

@@ -30,8 +30,7 @@ MYSQL_CONF_OPT = \
 	--without-libedit \
 	--without-readline \
 	--with-low-memory \
-	--enable-thread-safe-client \
-	$(ENABLE_DEBUG)
+	--enable-thread-safe-client
 
 ifeq ($(BR2_PACKAGE_MYSQL_SERVER),y)
 MYSQL_DEPENDENCIES += host-mysql host-bison
@@ -57,6 +56,14 @@ MYSQL_CONF_OPT += \
 	--without-plugin-innodb_plugin \
 	--without-plugin-ndbcluster
 
+# Debugging is only available for the server, so no need for
+# this if-block outside of the server if-block
+ifeq ($(BR2_ENABLE_DEBUG),y)
+MYSQL_CONF_OPT += --with-debug=full
+else
+MYSQL_CONF_OPT += --without-debug
+endif
+
 define HOST_MYSQL_BUILD_CMDS
 	$(MAKE) -C $(@D)/include my_config.h
 	$(MAKE) -C $(@D)/mysys libmysys.a