URL:
<https://savannah.gnu.org/bugs/?57681>
Summary: 2nd expansion only for required targets
Project: make
Submitted by: ydaveluy
Submitted on: lun. 27 janv. 2020 21:02:13 UTC
Severity: 3 - Normal
Item Group: Enhancement
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 4.3
Operating System: Any
Fixed Release: None
Triage Status: None
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Details:
Hello,
The second expansion of the prerequisites should be done only when a target is
needed. This could improve performances.
With this design it will be possible to include dependencies file only when
needed.
Actually the next pattern is often used:
deps:=$(patsubst %.o,%.d,${objects})
-include ${deps}
%.o : %.c
${GCC} ...
With this pattern all existing dependencies files are included even if only
one file needs to be recompiled.
If 2nd expansions were performed only when a target is needed, we could write
previous pattern like this:
%.o : %.c $$(get_dependencies %.d)
get_dependencies can be a user or builtin function that read the dependency
file and return the list of prerequisites.
I developed this enhancement in the following repo:
https://github.com/ydaveluy/make/tree/feature_2nd_expansion_improvement
Thanks to give me your feedback.
Yannick
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