WL#3504 "plugin actions for engines' and plugins' unit tests"

for push in 5.1 (I will inform Trudy).
Storage engines and plugins can now have unit tests to test their components; such
test must be an executable C/C++ program which name ends with '-t' and which is
obeys the mytap protocol, it must be stored in the storage engine's or plugin's
source directory (storage/<engine> or plugin/<plugin>) or any subdirectories of
this.
The top-level Makefile target "test-unit" will run all unit tests: it will scan
the engines' and plugins' directories, recursively, and execute all executable
files which name ends with '-t'."


Makefile.am:
  "unittest" directory must be built before "storage" and "plugin"
  because the unit tests in these directories may need libmytap.a
  which is in unittest/mytap.
config/ac-macros/plugins.m4:
  When enabling engine "X", we add "../storage/X" to the unit tests
  directories which unittest/unit.pl should traverse looking for
  tests to execute. Same for plugins.
unittest/Makefile.am:
  Those variables contain all enabled engines and plugins.

Makefile.am

@@ -24,11 +24,11 @@ EXTRA_DIST =		INSTALL-SOURCE INSTALL-WIN-SOURCE \
 SUBDIRS =		. include @docs_dirs@ @zlib_dir@ \
 			@readline_topdir@ sql-common \
 			@thread_dirs@ pstack \
-			@sql_union_dirs@ storage plugin \
+			@sql_union_dirs@ unittest storage plugin \
 			@sql_server@ scripts @man_dirs@ tests \
 			netware @libmysqld_dirs@ \
 			mysql-test support-files @tools_dirs@ \
-			unittest win
+			win
 
 DIST_SUBDIRS =		$(SUBDIRS) BUILD
 

config/ac-macros/plugins.m4

@@ -280,6 +280,8 @@ AC_DEFUN([MYSQL_CONFIGURE_PLUGINS],[
     _MYSQL_EMIT_PLUGIN_ACTIONS(m4_bpatsubst(__mysql_plugin_list__, :, [,]))
     AC_SUBST([mysql_se_dirs])
     AC_SUBST([mysql_pg_dirs])
+    AC_SUBST([mysql_se_unittest_dirs])
+    AC_SUBST([mysql_pg_unittest_dirs])
    ])
  ])
 ])
@@ -410,9 +412,15 @@ dnl Although this is "pretty", it breaks libmysqld build
           [AC_CONFIG_FILES($6/Makefile)]
         )
         ifelse(m4_substr($6, 0, 8), [storage/],
-          [mysql_se_dirs="$mysql_se_dirs ]m4_substr($6, 8)",
+          [
+            [mysql_se_dirs="$mysql_se_dirs ]m4_substr($6, 8)"
+             mysql_se_unittest_dirs="$mysql_se_unittest_dirs ../$6"
+          ],
           m4_substr($6, 0, 7), [plugin/],
-          [mysql_pg_dirs="$mysql_pg_dirs ]m4_substr($6, 7)",
+          [
+            [mysql_pg_dirs="$mysql_pg_dirs ]m4_substr($6, 7)"
+             mysql_pg_unittest_dirs="$mysql_pg_unittest_dirs ../$6"
+          ],
           [AC_FATAL([don't know how to handle plugin dir ]$6)])
       fi
     ])

unittest/Makefile.am

@@ -3,7 +3,7 @@ SUBDIRS      = mytap . mysys examples
 EXTRA_DIST = unit.pl
 CLEANFILES = unit
 
-unittests = mytap mysys
+unittests = mytap mysys @mysql_se_unittest_dirs@  @mysql_pg_unittest_dirs@
 
 test:
 	perl unit.pl run $(unittests)