tasks.c is missing #if ( configGENERATE_RUN_TIME_STATS == 1 ) bracketing the call to portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() at line 1122.

--- tasks.c(revision 2690)
+++ tasks.c(revision 2692)
@@ -1116,11 +1116,13 @@
xSchedulerRunning = pdTRUE;
xTickCount = ( portTickType ) 0;

+ #if ( configGENERATE_RUN_TIME_STATS == 1 )
/* If configGENERATE_RUN_TIME_STATS is defined then the following
macro must be defined to configure the timer/counter used to generate
the run time counter time base. */
portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();
-
+#endif
+
/* Setting up the timer tick is hardware specific and thus in the
portable interface. */
if( xPortStartScheduler() )

I don't understand this patch and can only assume you are using an old version of FreeRTOS or have modified the code yourself. If an #endif was missing, nothing would compile, surely?

The code between lines 1104 and 1135 looks like this, there are no conditional compilations.

if( xReturn == pdPASS )
{
/* Interrupts are turned off here, to ensure a tick does not occur
before or during the call to xPortStartScheduler().  The stacks of
the created tasks contain a status word with interrupts switched on
so interrupts will automatically get re-enabled when the first task
starts to run.

STEPPING THROUGH HERE USING A DEBUGGER CAN CAUSE BIG PROBLEMS IF THE
DEBUGGER ALLOWS INTERRUPTS TO BE PROCESSED. */
portDISABLE_INTERRUPTS();

xSchedulerRunning = pdTRUE;
xTickCount = ( portTickType ) 0;

/* If configGENERATE_RUN_TIME_STATS is defined then the following
macro must be defined to configure the timer/counter used to generate
the run time counter time base. */
portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();

/* Setting up the timer tick is hardware specific and thus in the
portable interface. */
if( xPortStartScheduler() )
{
/* Should not reach here as if the scheduler is running the
function will not return. */
}
else
{
/* Should only reach here if a task calls xTaskEndScheduler(). */
}
}

regards.

I am using 7.0.1. It is the added #if that is the key thing, not a missing #endif. You should not try to call portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() (which is at tasks.c line 1122) if configGENERATE_RUN_TIME_STATS is not defined. Of course, defining portCONFIGURE_TIMER_FOR_RUN_TIME_STATS as a null macro in FreeRTOSConfig.h works just as well, but it seems cleaner to me not to try to call it in the first place.

If portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() is not defined then it will get automatically removed by code in FreeRTOS.h

#ifndef portCONFIGURE_TIMER_FOR_RUN_TIME_STATS
#define portCONFIGURE_TIMER_FOR_RUN_TIME_STATS()
#endif

If you have a problem compiling then it is likely the header files are not included in the correct order, although it should not be a problem compiling tasks.c. Have you made any changes to the code?