diff options
Diffstat (limited to 'unit-tests/directive-ifmake.mk')
| -rw-r--r-- | unit-tests/directive-ifmake.mk | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/unit-tests/directive-ifmake.mk b/unit-tests/directive-ifmake.mk index 4d49add72626..4824ce4d0570 100644 --- a/unit-tests/directive-ifmake.mk +++ b/unit-tests/directive-ifmake.mk @@ -1,12 +1,12 @@ -# $NetBSD: directive-ifmake.mk,v 1.8 2020/11/15 20:20:58 rillig Exp $ +# $NetBSD: directive-ifmake.mk,v 1.9 2022/01/22 16:23:56 rillig Exp $ # # Tests for the .ifmake directive, which provides a shortcut for asking # whether a certain target is requested to be made from the command line. # # TODO: Describe why the shortcut may be useful (if it's useful at all), -# instead of sticking to the simple '.if' only. +# instead of using the more versatile '.if make(target)'. -# The targets 'first' and 'second' are passed in on the command line. +.MAKEFLAGS: first second # This is the most basic form. .ifmake first @@ -15,9 +15,9 @@ . warning positive condition fails .endif -# The not operator works as expected. -# An alternative interpretation were that this condition is asking whether -# the target "!first" was requested. To distinguish this, see the next test. +# The '!' is interpreted as 'not'. A possible alternative interpretation of +# this condition is whether the target named "!first" was requested. To +# distinguish these cases, see the next test. .ifmake !first . warning unexpected .else @@ -78,5 +78,30 @@ .endif -first second unmentioned late-target: +# As an edge case, a target can actually be named "!first" on the command +# line. There is no way to define a target of this name though since in a +# dependency line, a plain '!' is interpreted as a dependency operator. + +.MAKEFLAGS: !edge +.ifmake edge +. error +.endif + +# The '\!edge' in the following condition is parsed as a bare word. For such +# a bare word, there is no escaping mechanism so the backslash passes through. +# Since the condition function 'make' accepts a pattern instead of a plain +# target name, the '\' is finally discarded in Str_Match. +.ifmake \!edge +.else +. error +.endif + +# In a dependency line, a plain '!' is interpreted as a dependency operator +# (the other two are ':' and '::'). If the '!' is escaped by a '\', as +# implemented in ParseDependencyTargetWord, the additional backslash is never +# removed though. The target name thus becomes '\!edge' instead of the +# intended '!edge'. Defining a target whose name contains a '!' will either +# require additional tricks, or it may even be impossible. + +first second unmentioned late-target \!edge: : $@ |