Sebastian Huber writes:
> Hello,
>
> for RTEMS we use linker sets to initialize the system. The following
> code worked up to GCC 6, but no longer in GCC 7:
>
> typedef void ( *rtems_sysinit_handler )( void );
>
> typedef struct {
> rtems_sysinit_handler handler;
> } rtems_sysinit_item;
>
> rtems_sysinit_item volatile const _Linker_set__Sysinit_begin[0]
> __attribute__((__section__(".rtemsroset." "_Sysinit" ".begin")))
> __attribute__((__used__));
>
> rtems_sysinit_item volatile const _Linker_set__Sysinit_end[0]
> __attribute__((__section__(".rtemsroset." "_Sysinit" ".end")))
> __attribute__((__used__));
>
> void rtems_initialize_executive(void)
> {
> const volatile rtems_sysinit_item *cur = _Linker_set__Sysinit_begin;
> const volatile rtems_sysinit_item *end = _Linker_set__Sysinit_end;
You likely have 'volatile' in a wrong place. Try (untested):
rtems_sysinit_item const _Linker_set__Sysinit_begin[0]
__attribute__((__section__(".rtemsroset." "_Sysinit" ".begin")))
__attribute__((__used__));
rtems_sysinit_item const _Linker_set__Sysinit_end[0]
__attribute__((__section__(".rtemsroset." "_Sysinit" ".end")))
__attribute__((__used__));
void rtems_initialize_executive(void)
{
rtems_sysinit_item const *volatile cur = _Linker_set__Sysinit_begin;
rtems_sysinit_item const *volatile end = _Linker_set__Sysinit_end;
while(cur != end) {
cur->handler();
++cur;
}
}
Alternatively, try (untested, and I removed attributes to make my point
clearer):
/* Linker-defined symbols */
rtems_sysinit_item const _Linker_set__Sysinit_begin[0]
__attribute__((__section__(".rtemsroset." "_Sysinit" ".begin")))
__attribute__((__used__));
rtems_sysinit_item const _Linker_set__Sysinit_end[0]
__attribute__((__section__(".rtemsroset." "_Sysinit" ".end")))
__attribute__((__used__));
/* Get volatile pointers to the above */
static rtems_sysinit_item const *volatile begin_ = _Linker_set__Sysinit_begin;
static rtems_sysinit_item const *volatile end_ = _Linker_set__Sysinit_end;
void rtems_initialize_executive(void)
{
rtems_sysinit_item const *cur = begin_;
rtems_sysinit_item const *end = end_;
while(cur != end) {
cur->handler();
++cur;
}
}
HTH
-- Sergey
