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authorZack Weinberg <zackw@panix.com>2016-12-06 10:14:42 -0500
committerZack Weinberg <zackw@panix.com>2016-12-08 15:45:33 -0500
commitc03073774f915fe7841c2b551fe304544143470f (patch)
tree724d0dff62918aba70b4e4fc17c80f35f2e6eafa /scripts
parent3d6bfcace17a479c2e006a33567af80e6070583f (diff)
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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 'scripts')
-rw-r--r--scripts/check-installed-headers.sh1
1 files changed, 0 insertions, 1 deletions
diff --git a/scripts/check-installed-headers.sh b/scripts/check-installed-headers.sh
index a245fe6..89e1514 100644
--- a/scripts/check-installed-headers.sh
+++ b/scripts/check-installed-headers.sh
@@ -143,7 +143,6 @@ EOF
inappropriate for this test. */
#undef _LIBC
#undef _GNU_SOURCE
-#undef _REENTRANT
/* The library mode is selected here rather than on the command line to
ensure that this selection wins. */
$expanded_lib_mode