Follow-up Comment #3, bug #51309 (project make):
There's no question that
FOO := $(notdir $(wildcard Bau/*.txt))
is more efficient than:
~/Projekte> $(cd Bau && echo "echo $(ls *txt)")
because the latter involves starting a whole new shell (two, technically)
while the former is handled entirely within the make process with no fork/exec
operation required.
If you can show actual results where adding the notdir makes a significant
performance difference in a makefile environment we can reconsider, but I'm
not interested in adding new features duplicating existing capabilities
without proof that there's a real need.
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