06b9b3e0ad
Quite a lot of churn on style, but lots of
good work refactoring complicated functions
and lots more unit-tests.
Thanks mostly to rillig at NetBSD
Some interesting entries from ChangeLog
o .MAKE.{UID,GID} represent uid and gid running make.
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable
checks in InitObjdir. Explicit .OBJDIR target always allows
read-only directory.
o add more unit tests for META MODE
Merge commit '8e11a9b4250be3c3379c45fa820bff78d99d5946' into main
Change-Id: I464fd4c013067f0915671c1ccc96d2d8090b2b9c
45 lines
1.4 KiB
Makefile
45 lines
1.4 KiB
Makefile
# $NetBSD: suff-rebuild.mk,v 1.6 2020/11/21 12:01:16 rillig Exp $
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#
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# Demonstrates what happens to transformation rules (called inference rules
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# by POSIX) when all suffixes are deleted.
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all: suff-rebuild-example
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.MAKEFLAGS: -dpst
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.SUFFIXES:
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.SUFFIXES: .a .b .c
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suff-rebuild-example.a:
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: Making ${.TARGET} out of nothing.
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.a.b:
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: Making ${.TARGET} from ${.IMPSRC}.
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.b.c:
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: Making ${.TARGET} from ${.IMPSRC}.
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.c:
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: Making ${.TARGET} from ${.IMPSRC}.
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# XXX: At a quick glance, the code in SuffUpdateTarget looks as if it were
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# possible to delete the suffixes in the middle of the makefile, add back
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# the suffixes from before, and have the transformation rules preserved.
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#
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# As of 2020-09-25, uncommenting the following line results in the error
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# message "don't know how to make suff-rebuild-example" though.
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#
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# If this is a bug, the actual cause is probably that when a suffix
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# transformation rule is defined, it is not added to the global list of
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# targets, see Suff_EndTransform. Later, UpdateTargets iterates over exactly
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# this global list of targets though.
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#
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# If UpdateTargets were to iterate over 'transforms' as well, it still
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# wouldn't work because the condition 'ptr == target->name' skips these
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# transformation rules.
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#.SUFFIXES:
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# Add the suffixes back. It should not matter that the order of the suffixes
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# is different from before.
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.SUFFIXES: .c .b .a
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