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1b65f0bd2b
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable checks in InitObjdir. Explicit .OBJDIR target always allows read-only directory. o Fix building and unit-tests on non-BSD. o More code cleanup and refactoring. o More unit tests
83 lines
2.3 KiB
Makefile
83 lines
2.3 KiB
Makefile
# $NetBSD: directive-ifmake.mk,v 1.8 2020/11/15 20:20:58 rillig Exp $
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#
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# Tests for the .ifmake directive, which provides a shortcut for asking
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# whether a certain target is requested to be made from the command line.
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#
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# TODO: Describe why the shortcut may be useful (if it's useful at all),
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# instead of sticking to the simple '.if' only.
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# The targets 'first' and 'second' are passed in on the command line.
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# This is the most basic form.
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.ifmake first
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. info ok: positive condition works
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.else
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. warning positive condition fails
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.endif
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# The not operator works as expected.
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# An alternative interpretation were that this condition is asking whether
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# the target "!first" was requested. To distinguish this, see the next test.
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.ifmake !first
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. warning unexpected
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.else
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. info ok: negation works
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.endif
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# See if the exclamation mark really means "not", or if it is just part of
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# the target name. Since it means 'not', the two exclamation marks are
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# effectively ignored, and 'first' is indeed a requested target. If the
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# exclamation mark were part of the name instead, the name would be '!!first',
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# and such a target was not requested to be made.
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.ifmake !!first
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. info ok: double negation works
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.else
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. warning double negation fails
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.endif
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# Multiple targets can be combined using the && and || operators.
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.ifmake first && second
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. info ok: both mentioned
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.else
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. warning && does not work as expected
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.endif
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# Negation also works in complex conditions.
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.ifmake first && !unmentioned
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. info ok: only those mentioned
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.else
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. warning && with ! does not work as expected
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.endif
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# Using the .MAKEFLAGS special dependency target, arbitrary command
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# line options can be added at parse time. This means that it is
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# possible to extend the targets to be made.
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.MAKEFLAGS: late-target
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.ifmake late-target
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. info Targets can even be added at parse time.
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.else
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. info No, targets cannot be added at parse time anymore.
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.endif
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# Numbers are interpreted as numbers, no matter whether the directive is
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# a plain .if or an .ifmake.
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.ifmake 0
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. error
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.endif
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.ifmake 1
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.else
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. error
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.endif
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# A condition that consists of a variable expression only (without any
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# comparison operator) can be used with .if and the other .ifxxx directives.
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.ifmake ${:Ufirst}
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. info ok
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.else
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. error
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.endif
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first second unmentioned late-target:
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: $@
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