[gcc v2] Enable some features for RTEMS in libstdc++

[Sebastian Huber]

On 09/06/2022 20:19, Sebastian Huber wrote:
> Remove RTEMS support from crossconfig.m4 since this code is not used due to
> "with_newlib" being "yes".
> 
> libstdc++-v3/ChangeLog:
> 
> 	* configure: Regnerate.
> 	* configure.ac (newlib, *-rtems*): Enable TLS support for all RTEMS
> 	targets except bfin, lm32, mips, moxie, or1k, and v850.
> 	For all RTEMS targets, define HAVE_ALIGNED_ALLOC, HAVE_AT_QUICK_EXIT,
> 	HAVE_LINK, HAVE_POLL, HAVE_QUICK_EXIT, HAVE_READLINK, HAVE_SETENV,
> 	HAVE_SLEEP, HAVE_SOCKATMARK, HAVE_STRERROR_L, HAVE_SYMLINK,
> 	HAVE_TRUNCATE, and HAVE_USLEEP.
> 	* crossconfig.m4 (*-rtems*): Remove.

Any comments? I would like to back port this patch to GCC 10, 11, and 12.

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