Add --enable-developer configure flag, reduce default logging

Developer flag (off by default) sets high logging, ASAN by default, while
users by default will get only ERR debugging but DEBUG level messages built in by default.

configure.ac

@@ -56,8 +56,25 @@ dnl silent automake requires version 1.11
 m4_ifdef([AM_SILENT_RULES],
 	 [AM_SILENT_RULES([yes])])
 
+AC_ARG_ENABLE([developer],
+              [AS_HELP_STRING([--enable-developer],
+	                      [Enable developer build (more logging, address santizer, ... (default: no))])],
+	      [enable_devel=$enabkeval],
+	      [enable_devel=no])
+AS_IF([test "x$enable_devel" != "xno"],
+	    [ dnl enable ASAN for developers
+              enable_asan=yes
+              dnl include NOISE level debugging ability, but default to DEBUG
+	      CPPFLAGS="-DMSTRO_DEFAULT_LOG_LEVEL=3 -DMSTRO_MAX_DEBUG_LEVEL=4 $CPPFLAGS"
+              
+            ],
+            [ dnl set logging to ERR, and limit logging to DEBUG
+	      CPPFLAGS="-DMSTRO_DEFAULT_LOG_LEVEL=0 -DMSTRO_MAX_DEBUG_LEVEL=3 $CPPFLAGS"
+            ])
+
+
 AC_ARG_ENABLE([numa],
-              [AS_HELP_STRING([--enable-numa],[Disable libnuma usage (default: use if detected)])],
+              [AS_HELP_STRING([--enable-numa],[Enable libnuma usage (default: use if detected)])],
 	      [enable_numa=$enableval],[enable_numa=yes])
 AS_IF([test "x$enable_numa" = xyes],
       [AC_CHECK_HEADERS([numa.h numaif.h],
@@ -155,7 +172,8 @@ else
 fi
 
 AC_ARG_ENABLE([asan],
-              AS_HELP_STRING([--enable-asan],[Enable Address Sanitizer support]))
+              AS_HELP_STRING([--enable-asan],
+			     [Enable Address Sanitizer support]))
 if test "x$enable_asan" = "xyes"; then
         BUILD_ASAN=yes
         AX_CHECK_COMPILE_FLAG([-fsanitize=address -fno-omit-frame-pointer -Wpedantic -Wextra ],

maestro/logging.c

@@ -174,8 +174,16 @@ const char * const mstro_log_labels[MSTRO_log__MAX] = {
  *
  * Only messages with level <= g_debug_level will be printed
  *
+ * Defaults to the compile-time maximum supported log level
+ * (MSTRO_MAX_LOG_LEVEL), unless a specific compile value is defined
+ * for MSTRO_DEFAULT_LOG_LEVEL.
+ *
  **/
+#ifdef MSTRO_DEFAULT_LOG_LEVEL
+static int g_debug_level = MSTRO_DEFAULT_LOG_LEVEL;
+#else
 static int g_debug_level = MSTRO_MAX_LOG_LEVEL;
+#endif
 
 /** Log print color */
 static enum ansi_color_symbol g_log_color = MSTRO_COLOR_DEFAULT;