On 06.05.24 16:20, Qing Zhao wrote:
Hi, Sebastian,
Looks like that the behavior you described is correct.
What’s your major concern? ( a little confused).
I am concerned that the static initialization of structures with
flexible array members no longer works. In the RTEMS open source
real-time operating system, we use flexible array members in some parts.
One example is the thread control block which is used to manage a thread:
struct _Thread_Control {
/** This field is the object management structure for each thread. */
Objects_Control Object;
[...]
/**
* @brief Variable length array of user extension pointers.
*
* The length is defined by the application via <rtems/confdefs.h>.
*/
void *extensions[];
};
In a static configuration of the operating system we have something like
this:
struct Thread_Configured_control {
/*
* This was added to address the following warning.
* warning: invalid use of structure with flexible array member
*/
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
Thread_Control Control;
#pragma GCC diagnostic pop
#if CONFIGURE_MAXIMUM_USER_EXTENSIONS > 0
void *extensions[ CONFIGURE_MAXIMUM_USER_EXTENSIONS + 1 ];
#endif
Configuration_Scheduler_node Scheduler_nodes[
_CONFIGURE_SCHEDULER_COUNT ];
RTEMS_API_Control API_RTEMS;
#ifdef RTEMS_POSIX_API
POSIX_API_Control API_POSIX;
#endif
#if CONFIGURE_MAXIMUM_THREAD_NAME_SIZE > 1
char name[ CONFIGURE_MAXIMUM_THREAD_NAME_SIZE ];
#endif
#if defined(_CONFIGURE_ENABLE_NEWLIB_REENTRANCY) && \
!defined(_REENT_THREAD_LOCAL)
struct _reent Newlib;
#endif
};
This is used to define a table of thread control blocks:
Thread_Configured_control \
name##_Objects[ _Objects_Maximum_per_allocation( max ) ]; \
static RTEMS_SECTION( ".noinit.rtems.content.objects." #name ) \
I would like no know which consequences the deprecation this GCC
extension has.
--
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