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b897d72a5a
Changes since 20181221 are mostly portability related
hence the large gap in versions imported.
There are however some bug fixes, and a rework of filemon handling.
In NetBSD make/filemon/filemon_ktrace.c allows use of fktrace
and elimination of filemon(4) which has not had the TLC it needs.
FreeBSD filemon(4) is in much better shape, so bmake/filemon/filemon_dev.c
allows use of that, with a bit less overhead than the ktrace model.
Summary of changes from ChangeLog
o str.c: empty string does not match % pattern
plus unit-test changes
o var.c: import handling of old sysV style modifier using '%'
o str.c: refactor brk_string
o meta.c: meta_oodate, CHECK_VALID_META is too aggressive for CMD
a blank command is perfectly valid.
o meta.c: meta_oodate, check for corrupted meta file
earlier and more often.
* meta.c: meta_compat_parent check for USE_FILEMON
patch from Soeren Tempel
o meta.c: fix compat mode, need to call meta_job_output()
o job.c: extra fds for meta mode not needed if using filemon_dev
o meta.c: avoid passing NULL to filemon_*() when meta_needed()
returns FALSE.
o filemon/filemon_{dev,ktrace}.c: allow selection of
filemon implementation. filemon_dev.c uses the kernel module
while filemon_ktrace.c leverages the fktrace api available in
NetBSD. filemon_ktrace.c can hopefully form the basis for
adding support for other tracing mechanisms such as strace on
Linux.
o meta.c: when target is out-of-date per normal make rules
record value of .OODATE in meta file.
o parse.c: don't pass NULL to realpath(3)
some versions cannot handle it.
o parse.c: ParseDoDependency: free paths rather than assert
plus more unit-tests
24 lines
930 B
Makefile
24 lines
930 B
Makefile
# $NetBSD: cond-late.mk,v 1.1 2020/04/29 23:15:21 rillig Exp $
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#
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# Using the :? modifier, variable expressions can contain conditional
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# expressions that are evaluated late. Any variables appearing in these
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# conditions are expanded before parsing the condition. This is
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# different from many other places.
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#
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# Because of this, variables that are used in these lazy conditions
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# should not contain double-quotes, or the parser will probably fail.
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#
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# They should also not contain operators like == or <, since these are
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# actually interpreted as these operators. This is demonstrated below.
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#
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# If the order of evaluation were to change to first parse the condition
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# and then expand the variables, the output would change from the
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# current "yes no" to "yes yes", since both variables are non-empty.
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COND.true= "yes" == "yes"
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COND.false= "yes" != "yes"
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all:
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@echo ${ ${COND.true} :?yes:no}
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@echo ${ ${COND.false} :?yes:no}
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