You can write a conditional that tests
make command flags such as
‘-t’ by using the variable
MAKEFLAGS together with the
(see Functions for String Substitution and Analysis).
This is useful when
touch is not enough to make a file appear up
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
For example, here is 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 recipe lines as “recursive” so that
they will be executed despite use of the ‘-t’ flag.
See Recursive Use of