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Conditionals
that test flags
You
can write a conditional that tests make
command flags such as -t
by using the variable MAKEFLAGS
together with the findstring
function (see Functions
for string substitution and analysis ). This is useful when
touch
is not enough to make a file appear up to date.
The findstring
function determines whether one string appears as a substring of another.
If you want to test for the -t
flag, use t
as the first string and the value of MAKEFLAGS
as the other.
For example, the following
shows how to arrange to use ranlib
-t to finish
marking an archive file up to date.
archive.a... :
ifneq (,$(findstring t,$(MAKEFLAGS)))
+touch archive.a
+ranlib -t archive.a
else
ranlib archive.a
endif
The +
prefix marks those command lines as recursive so that they will be executed
despite use of the -t
flag. See Recursive
use of make.
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