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| author | Zack Weinberg <zackw@panix.com> | 2016-12-06 10:14:42 -0500 |
|---|---|---|
| committer | Zack Weinberg <zackw@panix.com> | 2016-12-08 15:45:33 -0500 |
| commit | c03073774f915fe7841c2b551fe304544143470f (patch) | |
| tree | 724d0dff62918aba70b4e4fc17c80f35f2e6eafa /NEWS | |
| parent | 3d6bfcace17a479c2e006a33567af80e6070583f (diff) | |
| download | glibc-c03073774f915fe7841c2b551fe304544143470f.tar.gz glibc-c03073774f915fe7841c2b551fe304544143470f.tar.xz glibc-c03073774f915fe7841c2b551fe304544143470f.zip | |
Make _REENTRANT and _THREAD_SAFE aliases for _POSIX_C_SOURCE=199506L.
For many years, the only effect of these macros has been to make unistd.h declare getlogin_r. _POSIX_C_SOURCE >= 199506L also causes this function to be declared. However, people who don't carefully read all the headers might be confused into thinking they need to define _REENTRANT for any threaded code (as was indeed the case a long time ago). Therefore, remove __USE_REENTRANT, and make _REENTRANT and _THREAD_SAFE into synonyms for _POSIX_C_SOURCE=199506L. This will only affect programs that don't select a higher conformance level some other way. For instance, -std=c89 -D_REENTRANT will see a change in visible declarations, but -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT won't, and -D_REENTRANT all by itself also won't, because _DEFAULT_SOURCE implies _POSIX_C_SOURCE > 199506. * include/features.h: Remove __USE_REENTRANT. Treat _REENTRANT and _THREAD_SAFE the same as _POSIX_C_SOURCE=199506L, if a higher POSIX conformance level has not been selected by other macros. * NEWS, manual/creature.texi: Document this change. * posix/unistd.h, posix/bits/unistd.h: Don't check __USE_REENTRANT. * include/libc-symbols.h: Don't define _REENTRANT. * scripts/check-installed-headers.sh: Don't undefine _REENTRANT.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/NEWS b/NEWS index 922a5004ff..4fe8886e83 100644 --- a/NEWS +++ b/NEWS @@ -22,6 +22,19 @@ Version 2.25 from that TS. Note that most features from that TS are not supported by the GNU C Library. +* The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are + now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L. + Since the GNU C Library defaults to a much newer revision of POSIX, this + will only affect programs that specifically request an old conformance + mode. For instance, a program compiled with -std=c89 -D_REENTRANT will + see a change in the visible declarations, but a program compiled with + just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT, + will not. + + Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be + defined by all multithreaded code, but glibc has not required this for + many years. + * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This means that in a future release, the macros “major”, “minor”, and “makedev” will only be available from <sys/sysmacros.h>. |