log: add breakpoints when BREAK_LEVEL is reached

log.cpp

@@ -95,10 +95,36 @@ log_level (void)
 }
 
 
+//-----------------------------------------------------------------------------
+static bool
+needs_break (util::level_t level)
+{
+    static util::level_t break_level;
+    static bool has_level = [&] (void) {
+        const char *env = getenv ("BREAK_LEVEL");
+        if (!env)
+            return false;
+
+        try {
+            break_level = to_level (env);
+            return true;
+        } catch (...) {
+            return false;
+        }
+    } ();
+
+    return has_level && level <= break_level;
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 void
 util::log (util::level_t level, const std::string &msg)
 {
+    // fire a breakpoint before the following early exit
+    if (needs_break (level))
+        breakpoint ();
+
     static const util::level_t LOG_LEVEL = log_level ();
     if (level > LOG_LEVEL)
         return;