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Fix the MS-DOS, Haiku, USG, etc builds

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* configure.ac (emacs_cv_boot_time_file): Only compute this on
GNU/Linux, the sole system with systemd.
* nt/inc/ms-w32.h (BOOT_TIME_FILE): Remove now redundant #undef.
* src/filelock.c (get_boot_time): Eschew BOOT_TIME_FILE if not
defined.
This commit is contained in:
Po Lu 2023-08-10 01:53:26 +00:00
parent e1d08e9e11
commit c4e0b10f18
3 changed files with 15 additions and 12 deletions
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23
configure.ac
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@ -2625,11 +2625,11 @@ if test "$GCC" = yes && test "$ac_enable_autodepend" = yes; then
fi
AC_SUBST([AUTO_DEPEND])
BOOT_TIME_FILE=
AC_CACHE_CHECK([for old but post-boot file],
[emacs_cv_boot_time_file],
[AS_CASE([$opsys],
[*bsd|darwin|dragonfly],
[emacs_cv_boot_time_file='not needed'],
[gnu-linux],
[emacs_cv_boot_time_file=unknown
AS_IF([test $cross_compiling = no],
[# systemd puts it in /var/lib/systemd.
@ -2642,19 +2642,22 @@ AC_CACHE_CHECK([for old but post-boot file],
/var/run/random-seed
do
test -f $file && { emacs_cv_boot_time_file=$file; break; }
done])])])
done])],
[*], [emacs_cv_boot_time_file=not-needed])])
AS_CASE([$emacs_cv_boot_time_file],
[/*|*:*], [BOOT_TIME_FILE=\"$emacs_cv_boot_time_file\"],
[NULL|nullptr|0], [BOOT_TIME_FILE=$emacs_cv_boot_time_file],
['not needed'], [BOOT_TIME_FILE=NULL],
['not needed'], [BOOT_TIME_FILE=],
[# Guess systemd if unknown.
# If guess is wrong, Emacs falls back on something else.
BOOT_TIME_FILE=\"/var/lib/systemd/random-seed\"])
AC_DEFINE_UNQUOTED([BOOT_TIME_FILE], [$BOOT_TIME_FILE],
[Name of file that, if it exists, postdates boot and predates
the first Emacs invocation; or a null pointer if no such file is known.
This file is used only on GNU/Linux and other systems
that lack the FreeBSD-style sysctl with KERN_BOOTTIME.])
AS_IF([test -n "$BOOT_TIME_FILE"],
[AC_DEFINE_UNQUOTED([BOOT_TIME_FILE], [$BOOT_TIME_FILE],
[Name of file that, if it exists, postdates boot and predates
the first Emacs invocation; or a null pointer if no such file is known.
This file is used only on GNU/Linux and other systems
that lack the FreeBSD-style sysctl with KERN_BOOTTIME.])])
#### Choose a window system.