performance: allow limiting the maximum log level at compile time.

Although eina_log is not that harmful, allowing the user to remove
debug/info messages for production is good, it reduces the overhead
and also allows removing the strings from the final binary.

I'd recommend production builds with:

   ./configure --with-maximum-log-level=2





SVN revision: 72311

configure.ac

@@ -32,6 +32,22 @@ PKG_CHECK_MODULES([TERMINOLOGY], [${requirements}])
 
 EFL_WITH_BIN([edje], [edje-cc], [edje_cc])
 
+with_max_log_level="<unset>"
+AC_ARG_WITH(maximum-log-level,
+   [AC_HELP_STRING([--with-maximum-log-level=NUMBER],
+                   [limit terminology log level to the given number, any call to EINA_LOG() with values greater than this will be compiled out, ignoring runtime settings, but saving function calls.])],
+   [
+    if test "x${withval}" != "xno"; then
+       if echo "${withval}" | grep -E '^[[0-9]]+$' >/dev/null 2>/dev/null; then
+          AC_MSG_NOTICE([ignoring any EINA_LOG() with level greater than ${withval}])
+          AC_DEFINE_UNQUOTED(EINA_LOG_LEVEL_MAXIMUM, ${withval}, [if set, logging is limited to this amount.])
+          with_max_log_level="${withval}"
+       else
+          AC_MSG_ERROR([--with-maximum-log-level takes a decimal number, got "${withval}" instead.])
+       fi
+    fi
+    ], [:])
+
 AC_CONFIG_FILES([
 Makefile
 src/Makefile