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Simplify configuration of TM_GMTOFF and TM_ZONE.

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* private.h, zdump.c (_GNU_SOURCE): New macro.
(TM_GMTOFF) [!NO_TM_GMTOFF]:
(TM_ZONE) [!NO_TM_ZONE]: Guess definition if not already defined.
* Makefile, NEWS: Document the above.
This commit is contained in:
Paul Eggert
2014-08-19 18:16:15 -07:00
parent 2f7599d358
commit 96eff14f85
4 changed files with 41 additions and 18 deletions
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23
Makefile
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@ -161,25 +161,12 @@ GCC_DEBUG_FLAGS = -Dlint -g3 -O3 -fno-common -fstrict-aliasing \
# (or if you decide to add such a field in your system's "time.h" file),
# add the name to a define such as
# -DTM_GMTOFF=tm_gmtoff
# or
# -DTM_GMTOFF=_tm_gmtoff
# to the end of the "CFLAGS=" line.
# Neither tm_gmtoff nor _tm_gmtoff is described in X3J11's work;
# in its work, use of "tm_gmtoff" is described as non-conforming.
# Both Linux and BSD have done the equivalent of defining TM_GMTOFF in
# their recent releases.
#
# If your system has a "zone abbreviation" field in its "struct tm"s
# (or if you decide to add such a field in your system's "time.h" file),
# add the name to a define such as
# to the end of the "CFLAGS=" line. If not defined, the code attempts to
# guess TM_GMTOFF from other macros; define NO_TM_GMTOFF to suppress this.
# Similarly, if your system has a "zone abbreviation" field, define
# -DTM_ZONE=tm_zone
# or
# -DTM_ZONE=_tm_zone
# to the end of the "CFLAGS=" line.
# Neither tm_zone nor _tm_zone is described in X3J11's work;
# in its work, use of "tm_zone" is described as non-conforming.
# Both UCB and Sun have done the equivalent of defining TM_ZONE in
# their recent releases.
# and define NO_TM_ZONE to suppress any guessing. These two fields are not
# required by POSIX, but are widely available on GNU/Linux and BSD systems.
#
# If you want functions that were inspired by early versions of X3J11's work,
# add