Hi all,
I just stumbled across the following problem with dmake. Original
makefile.mk code read
X*=Y
which I wanted to change to something like
X=Y1
.IF Z
X+=Y2
.ENDIF
but keeping the semantics of the original X*=Y to not change X at all if
it "already has a value" (dmake/man/dmake.nc:1.7 l. 887). That is,
something like
.IF "$(X)"==""
X=Y1
.IF Z
X+=Y2
.ENDIF
.ENDIF
However, X*=Y apparently suppresses assignment iff X is undefined,
whereas apparently "$(X)"=="" iff X is undefined or X is defined to an
empty string. I did not find any construct in dmake that would allow me
to do what I want, apart from the DRY-violating
.IF Z
X=Y1 Y2
.ELIF
X=Y1
.ENDIF
- Would it make sense to change the semantics of X*=Y to suppress
assignment iff X is undefined or X is defined to an empty string?
- Otherwise, should we add something like
.IF defined(X)
to dmake?
-Stephan
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