compile even if gadget-sph is used.

src/logger.c

@@ -118,25 +118,29 @@ void logger_log_part(struct part *p, unsigned int mask, size_t *offset,
 
   /* Particle position as three doubles. */
   if (mask & logger_mask_x) {
-    memcpy(buff, p->x, 3 * sizeof(double))
+    memcpy(buff, p->x, 3 * sizeof(double));
     buff += 3 * sizeof(double);
   }
 
   /* Particle velocity as three floats. */
   if (mask & logger_mask_v) {
-    memcpy(buff, p->v, 3 * sizeof(float))
+    memcpy(buff, p->v, 3 * sizeof(float));
     buff += 3 * sizeof(float);
   }
 
   /* Particle accelleration as three floats. */
   if (mask & logger_mask_a) {
-    memcpy(buff, p->a_hydro, 3 * sizeof(float))
+    memcpy(buff, p->a_hydro, 3 * sizeof(float));
     buff += 3 * sizeof(float);
   }
 
   /* Particle internal energy as a single float. */
   if (mask & logger_mask_u) {
+#if defined(GADGET2_SPH)
+    memcpy(buff, &p->entropy, sizeof(float));
+#else
     memcpy(buff, &p->u, sizeof(float));
+#endif
     buff += sizeof(float);
   }
 

src/logger.h

@@ -25,7 +25,7 @@
 
 /**
  * Logger entries contain messages representing the particle data at a given
- * point in time during the simulation. 
+ * point in time during the simulation.
  *
  * The logger messages always start with an 8-byte header structured as
  * follows:
@@ -43,7 +43,8 @@
  *       |        |      | stored as three doubles.
  *   1   | v      | 12   | Particle velocity, stored as three floats.
  *   2   | a      | 12   | Particle acceleration, stored as three floats.
- *   3   | u      | 4    | Particle internal energy, stored as a single float.
+ *   3   | u      | 4    | Particle internal energy (or entropy, if Gadget-SPH
+ *       |        |      | is used), stored as a single float.
  *   4   | h      | 4    | Particle smoothing length, stored as a single float.
  *   5   | rho    | 4    | Particle density, stored as a single float.
  *   6   | consts | 12   | Particle constants, i.e. mass and ID.
@@ -71,8 +72,11 @@
 
 /* Function prototypes. */
 int logger_size(unsigned int mask);
-void logger_log_part(struct part *p, unsigned int mask, struct dump *dump);
-void logger_log_gpart(struct gpart *p, unsigned int mask, struct dump *dump);
-void logger_lot_timestamp(unsigned long long int timestamp, struct dump *dump);
+void logger_log_part(struct part *p, unsigned int mask, size_t *offset,
+                     struct dump *dump);
+void logger_log_gpart(struct gpart *p, unsigned int mask, size_t *offset,
+                      struct dump *dump);
+void logger_lot_timestamp(unsigned long long int timestamp, size_t *offset,
+                          struct dump *dump);
 
 #endif /* SWIFT_LOGGER_H */