URL:
<https://savannah.gnu.org/bugs/?56732>
Summary: VPATH doesn't work with pattern rules
Project: make
Submitted by: None
Submitted on: Thu 08 Aug 2019 11:26:35 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 4.2.1
Operating System: POSIX-Based
Fixed Release: None
Triage Status: None
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Details:
VPATH doesn't work with pattern rules, at least when using link libraries. I
can see nothing in the manual to suggest it shouldn't. Here's a reduced test
case.
Steps to reproduce:
In an empty directory, create the following dirs/files:
mkdir libs
touch libs/libAbc.a
mkdir input
touch input/example.in
touch input/example2.in
mkdir output
Create a Makefile with the following contents:
VPATH = libs
#irrelevant_recipe : -lAbc
# echo "This recipe is never run"
output/% : input/%.in -lAbc
@echo "Running recipe to build $@ from $<"
Run this command:
make output/example
Actual behaviour:
> make output/example
make: *** No rule to make target `output/example'. Stop.
Expected behaviour:
> make output/example
Running recipe to build output/example from input/example.in
Note: Uncommenting the "irrelevant" recipe causes the pattern rule to work in
the above case. However, this workaround only works for one item - if you try
to build example and example2 at the same time, it still fails to build
whichever one comes second. But either can be built individually:
> make output/example
Running recipe to build output/example from input/example.in
> make output/example2
Running recipe to build output/example2 from input/example2.in
> make output/example output/example2
Running recipe to build output/example from input/example.in
make: *** No rule to make target `output/example2'. Stop.
This makes it not useful as a workaround, as really the point of pattern rules
is to build multiple items using the same rule.
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<https://savannah.gnu.org/bugs/?56732>
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