oqgraph fix: not all gcc versions support -fvisibility-inlines-hidden

storage/oqgraph/Makefile.am

@@ -40,7 +40,9 @@ BOOST_CXXFLAGS =	-frtti -fexceptions -fimplicit-templates
 #   (automatically gets enabled anyway by -O* on some architectures)
 BOOST_CXXFLAGS+=	-O3 -fstrict-aliasing
 BOOST_CXXFLAGS+=	-falign-loops
+if HAVE_FVISIBILITY_INLINES_HIDDEN
 BOOST_CXXFLAGS+=	-fvisibility-inlines-hidden
+endif
 BOOST_CXXFLAGS+=	-funroll-loops -fno-trapping-math
 
 EXTRA_DIST =	ha_oqgraph.h ha_oqgraph.cc graphcore.cc \

storage/oqgraph/plug.in

@@ -2,9 +2,25 @@ MYSQL_STORAGE_ENGINE(oqgraph,,[Graph Storage Engine],
         [Open Query Graph Computation Engine], [])
 MYSQL_PLUGIN_DYNAMIC(oqgraph,   [oqgraph_engine.la])
 MYSQL_PLUGIN_DEPENDS_ON_MYSQL_INTERNALS(oqgraph, [ha_oqgraph.cc])
+MYSQL_PLUGIN_ACTIONS(oqgraph,[
+  AC_LANG_PUSH([C++])
+  AC_MSG_CHECKING([whether compiler supports  -fvisibility-inlines-hidden])
+  OLD_CXXFLAGS=$CXXFLAGS
+  CXXFLAGS="$CXXFLAGS -fvisibility-inlines-hidden"
+  AC_TRY_COMPILE([],[],[
+    AM_CONDITIONAL(HAVE_FVISIBILITY_INLINES_HIDDEN, true)
+    AC_MSG_RESULT([yes])
+  ], [
+    AC_MSG_RESULT([no])
+  ])
+  CXXFLAGS=$OLD_CXXFLAGS
+  AC_LANG_POP()
+])
+
 AM_CONDITIONAL([BUILD_OQGRAPH_FOR_MYSQL], true)
 AM_CONDITIONAL([BUILD_OQGRAPH_STANDALONE], false)
 AM_CONDITIONAL([HAVE_DTRACE], false)
+AM_CONDITIONAL(HAVE_FVISIBILITY_INLINES_HIDDEN, false)
 
 AC_LANG_PUSH([C++])