glibc

Tree: 4eff749e8f

Joseph Myers 858045ad1c Update floating-point feature test macro handling for C2X ISO C2X has made some changes to the handling of feature test macros related to features from the floating-point TSes, and to exactly what such features are present in what headers, that require corresponding changes in glibc. * For the few features that were controlled by __STDC_WANT_IEC_60559_BFP_EXT__ (and the corresponding DFP macro) in C2X, there is now instead a new feature test macro __STDC_WANT_IEC_60559_EXT__ covering both binary and decimal FP. This controls CR_DECIMAL_DIG in <float.h> (provided by GCC; I implemented support for the new feature test macro for GCC 11) and the totalorder and payload functions in <math.h>. C2X no longer says anything about __STDC_WANT_IEC_60559_BFP_EXT__ (so it's appropriate for that macro to continue to enable exactly the features from TS 18661-1). * The SNAN macros for each floating-point type have moved to <float.h> (and been renamed in the process). Thus, the copies in <math.h> should only be defined for __STDC_WANT_IEC_60559_BFP_EXT__, not for C2X. * The fmaxmag and fminmag functions have been removed (replaced by new functions for the new min/max operations in IEEE 754-2019). Thus those should also only be declared for __STDC_WANT_IEC_60559_BFP_EXT__. * The _FloatN / _FloatNx handling for the last two points in glibc is trickier, since __STDC_WANT_IEC_60559_TYPES_EXT__ is still in C2X (the integration of TS 18661-3 as an Annex, that is, which hasn't yet been merged into the C standard git repository but has been accepted by WG14), so C2X with that macro should not declare some things that are declared for older standards with that macro. The approach taken here is to provide the declarations (when __STDC_WANT_IEC_60559_TYPES_EXT__ is enabled) only when (defined __USE_GNU \|\| !__GLIBC_USE (ISOC2X)), so if C2X features are enabled then those declarations (that are only in TS 18661-3 and not in C2X) will only be provided if _GNU_SOURCE is defined as well. Thus _GNU_SOURCE remains a superset of the TS features as well as of C2X. Some other somewhat related changes in C2X are not addressed here. There's an open proposal not to include the fmin and fmax functions for the _FloatN / _FloatNx types, given the new min/max operations, which could be handled like the previous point if adopted. And the fromfp functions have been changed to return a result in floating type rather than intmax_t / uintmax_t; my inclination there is to treat that like that change of totalorder type (new symbol versions etc. for the ABI change; old versions become compat symbols and are no longer supported as an API). Tested for x86_64 and x86.		5 years ago
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types	Update copyright dates with scripts/update-copyrights	5 years ago
byteswap.h	Update copyright dates with scripts/update-copyrights	5 years ago
confname.h	sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305]	5 years ago
dirent.h	Update copyright dates with scripts/update-copyrights	5 years ago
dirent_ext.h	Update copyright dates with scripts/update-copyrights	5 years ago
dlfcn.h	Update copyright dates with scripts/update-copyrights	5 years ago
elfclass.h	Update.	27 years ago
endian.h	Update.	29 years ago
environments.h	Update copyright dates with scripts/update-copyrights	5 years ago
errno.h	Update copyright dates with scripts/update-copyrights	5 years ago
fcntl.h	Update copyright dates with scripts/update-copyrights	5 years ago
fenv.h	Update copyright dates with scripts/update-copyrights	5 years ago
floatn-common.h	Update copyright dates with scripts/update-copyrights	5 years ago
floatn.h	Update copyright dates with scripts/update-copyrights	5 years ago
flt-eval-method.h	Update copyright dates with scripts/update-copyrights	5 years ago
fp-fast.h	Update copyright dates with scripts/update-copyrights	5 years ago
fp-logb.h	Update copyright dates with scripts/update-copyrights	5 years ago
hwcap.h	Update copyright dates with scripts/update-copyrights	5 years ago
in.h	Update copyright dates with scripts/update-copyrights	5 years ago
indirect-return.h	Update copyright dates with scripts/update-copyrights	5 years ago
ioctl-types.h	Update copyright dates with scripts/update-copyrights	5 years ago
ioctls.h	Update.	29 years ago
ipc.h	Update copyright dates with scripts/update-copyrights	5 years ago
ipctypes.h	Update copyright dates with scripts/update-copyrights	5 years ago
iscanonical.h	Update copyright dates with scripts/update-copyrights	5 years ago
libc-header-start.h	Update floating-point feature test macro handling for C2X	5 years ago
libm-simd-decl-stubs.h	Update copyright dates with scripts/update-copyrights	5 years ago
link.h	* csu/elf-init.c (__libc_csu_fini): Don't do anything here.	22 years ago
local_lim.h	Update.	29 years ago
long-double.h	Update copyright dates with scripts/update-copyrights	5 years ago
math-vector.h	Update copyright dates with scripts/update-copyrights	5 years ago
mathdef.h	Update copyright dates with scripts/update-copyrights	5 years ago
mman.h	Update copyright dates with scripts/update-copyrights	5 years ago
mqueue.h	Update copyright dates with scripts/update-copyrights	5 years ago
msq.h	Update copyright dates with scripts/update-copyrights	5 years ago
netdb.h	Update copyright dates with scripts/update-copyrights	5 years ago
param.h	Update copyright dates with scripts/update-copyrights	5 years ago
poll.h	Update copyright dates with scripts/update-copyrights	5 years ago
posix_opt.h	Update.	29 years ago
pthreadtypes.h	2002-11-10 Roland McGrath <roland@redhat.com>	24 years ago
resource.h	Update copyright dates with scripts/update-copyrights	5 years ago
sched.h	Update copyright dates with scripts/update-copyrights	5 years ago
select.h	Update copyright dates with scripts/update-copyrights	5 years ago
sem.h	Update copyright dates with scripts/update-copyrights	5 years ago
setjmp.h	Update.	29 years ago
shm.h	Update copyright dates with scripts/update-copyrights	5 years ago
sigaction.h	Update copyright dates with scripts/update-copyrights	5 years ago
sigcontext.h	Update copyright dates with scripts/update-copyrights	5 years ago
sigevent-consts.h	Update copyright dates with scripts/update-copyrights	5 years ago
siginfo-consts.h	Update copyright dates with scripts/update-copyrights	5 years ago
signal_ext.h	Update copyright dates with scripts/update-copyrights	5 years ago
signum-arch.h	Update copyright dates with scripts/update-copyrights	5 years ago
signum-generic.h	Update copyright dates with scripts/update-copyrights	5 years ago
sigstack.h	Update copyright dates with scripts/update-copyrights	5 years ago
sigstksz.h	sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305]	5 years ago
sigthread.h	Update copyright dates with scripts/update-copyrights	5 years ago
sockaddr.h	Update copyright dates with scripts/update-copyrights	5 years ago
socket.h	Update copyright dates with scripts/update-copyrights	5 years ago
ss_flags.h	Update copyright dates with scripts/update-copyrights	5 years ago
stat.h	Update copyright dates with scripts/update-copyrights	5 years ago
statfs.h	Update copyright dates with scripts/update-copyrights	5 years ago
statvfs.h	Update copyright dates with scripts/update-copyrights	5 years ago
stdint-intn.h	Update copyright dates with scripts/update-copyrights	5 years ago
stdint-uintn.h	Update copyright dates with scripts/update-copyrights	5 years ago
stdlib-bsearch.h	Update copyright dates with scripts/update-copyrights	5 years ago
syslog-path.h	Update copyright dates with scripts/update-copyrights	5 years ago
sysmacros.h	Update copyright dates with scripts/update-copyrights	5 years ago
termios.h	Update copyright dates with scripts/update-copyrights	5 years ago
time.h	Update copyright dates with scripts/update-copyrights	5 years ago
time64.h	Update copyright dates with scripts/update-copyrights	5 years ago
timesize.h	Update copyright dates with scripts/update-copyrights	5 years ago
typesizes.h	Update copyright dates with scripts/update-copyrights	5 years ago
uintn-identity.h	Update copyright dates with scripts/update-copyrights	5 years ago
uio-ext.h	Update copyright dates with scripts/update-copyrights	5 years ago
uio_lim.h	Update copyright dates with scripts/update-copyrights	5 years ago
unistd_ext.h	Update copyright dates with scripts/update-copyrights	5 years ago
utmp.h	Update copyright dates with scripts/update-copyrights	5 years ago
utsname.h	Update copyright dates with scripts/update-copyrights	5 years ago
waitflags.h	Update copyright dates with scripts/update-copyrights	5 years ago
waitstatus.h	Update copyright dates with scripts/update-copyrights	5 years ago
wchar.h	Update copyright dates with scripts/update-copyrights	5 years ago
wordsize.h	Define wordsize.h macros everywhere	10 years ago