[bug #51309] Determination of a file list from a single folder without changing the working directory

[Paul D. Smith]

Follow-up Comment #8, bug #51309 (project make):

If, for example, you can show an example of notdir adding significantly to the
amount of time the make program takes.

To test this I created a makefile like this:


foo = ...

all: ; : $(words $(foo))


where the "..." represents 6000 paths hardcoded into the makefile.  I then ran
"time make":


$ time make
: 6000

real    0m0.004s
user    0m0.000s
sys     0m0.000s


Then I modified the makefile to add a notdir like this:


foo = $(notdir ...)

all: ; : $(words $(foo))


where the "..." is the same as last time.  I got this result:


$ time make
: 6000

real    0m0.004s
user    0m0.000s
sys     0m0.000s


Same time.  This means that the amount of time needed to run notdir on 6000
paths is less than 1/1000th of a second.  From this I conclude that the
performance impact of an additional notdir function is negligible and there's
no performance advantage to avoiding it.

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