Fix xbt_assert with side effects.

[simgrid.git] / src / kernel / resource / profile / trace_mgr.cpp

diff --git a/src/kernel/resource/profile/trace_mgr.cpp b/src/kernel/resource/profile/trace_mgr.cpp
index b0b40ca..a796657 100644 (file)
--- a/src/kernel/resource/profile/trace_mgr.cpp
+++ b/src/kernel/resource/profile/trace_mgr.cpp
@@ -100,8 +100,8 @@ Profile* Profile::from_string(const std::string& name, const std::string& input,
     if (sscanf(val.c_str(), "LOOPAFTER %lg\n", &periodicity) == 1)
       continue;
 
-    xbt_assert(sscanf(val.c_str(), "%lg  %lg\n", &event.date_, &event.value_) == 2, "%s:%d: Syntax error in trace\n%s",
-               name.c_str(), linecount, input.c_str());
+    XBT_ATTRIB_UNUSED int res = sscanf(val.c_str(), "%lg  %lg\n", &event.date_, &event.value_);
+    xbt_assert(res == 2, "%s:%d: Syntax error in trace\n%s", name.c_str(), linecount, input.c_str());
 
     xbt_assert(last_event->date_ <= event.date_,
                "%s:%d: Invalid trace: Events must be sorted, but time %g > time %g.\n%s", name.c_str(), linecount,