URL:
<https://savannah.gnu.org/bugs/?57866>
Summary: make fails to recognize dependency and substitute
variables
Project: make
Submitted by: None
Submitted on: Thu 20 Feb 2020 09:00:41 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 4.3
Operating System: POSIX-Based
Fixed Release: None
Triage Status: None
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Details:
I have a typical C++ project with inc, src and test directories.
In test, I have 3 tests: utils.cpp exception.cpp object.cpp and the Makefile
at the bottom (also attached).
I have encountered two problems:
- If I put definition of BR and src variables above the rule they are used,
they are not properly substituted and Makefile does not work at all. I thought
make variables are recursive and this should not make a difference.
- The below Makefile works as expected, but for example when I change
utils.cpp, make does not recognize the change and does not rebuild utils
executable.
targets = utils exception object
# required sources
utils_req = ../src/Util.cpp
exception_req = ../src/Exception.cpp ../src/InvalidObject.cpp $(utils_req)
object_req = ../src/Object.cpp $(exception_req)
all: $(targets)
clean:
@rm -f *.o $(targets)
$(targets): $(src)
$(BR)
# build & run. To be used in a rule
src = $@.cpp $($@_req)
BR = @clang++ -I.. -Wall -DMY_TEST -o $@ $(src) && ./$@
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File Attachments:
-------------------------------------------------------
Date: Thu 20 Feb 2020 09:00:41 AM UTC Name: Makefile Size: 403B By: None
<http://savannah.gnu.org/bugs/download.php?file_id=48455>
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<https://savannah.gnu.org/bugs/?57866>
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