URL: <https://savannah.gnu.org/bugs/?65982>
Summary: make --trace does not explain remade include files
Group: make
Submitter: None
Submitted: Sat 13 Jul 2024 02:38:49 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 4.4.1
Operating System: POSIX-Based
Fixed Release: None
Triage Status: None
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Follow-up Comments:
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Date: Sat 13 Jul 2024 02:38:49 AM UTC By: Anonymous
Consider the following makefile (also attached). It makes one object file
xxx.o and also includes 2 generated makefiles. I want to use --trace to
understand why and when the include files were generated and when make
restarts, in a much larger makefile system of course. But the --trace logic
says nothing about makefile remaking. It explains why the .o is rebuilt but is
silent about the .mk.
Both %.o and %.mk are given artificial dependencies on Makefile. Thus when I
"touch Makefile" all must be rebuilt, but only %.o is and "all" are
explained.
$ cat Makefile
.PHONY: all
all: xxx.o
@:
ifeq ($(filter clean,$(MAKECMDGOALS)),)
$(info MAKE_RESTARTS=$(MAKE_RESTARTS))
now := $(shell date)
include x1.mk
endif
%.mk: Makefile
@:$(info Making $@)
@echo '$$(info Including $$(lastword $$(MAKEFILE_LIST)) at $(now))' >
$@
%.o: %.c Makefile
$(CC) -c -o $@ $<
.PHONY: clean
clean:
$(RM) x1.mk xxx.o
The sequence below shows --trace explaining the rebuild of xxx.o and "all" but
not of x1.mk:
$ make-4.4.1 clean
rm -f x1.mk xxx.o
$ make-4.4.1 --trace
MAKE_RESTARTS=
Making x1.mk
MAKE_RESTARTS=1
Including x1.mk at Fri Jul 12 19:31:26 PDT 2024
Makefile:16: update target 'xxx.o' due to: target does not exist
cc -c -o xxx.o xxx.c
Makefile:3: update target 'all' due to: target is .PHONY
:
$ touch Makefile
$ make-4.4.1 --trace
MAKE_RESTARTS=
Including x1.mk at Fri Jul 12 19:31:26 PDT 2024
Making x1.mk
MAKE_RESTARTS=1
Including x1.mk at Fri Jul 12 19:31:33 PDT 2024
Makefile:16: update target 'xxx.o' due to: Makefile
cc -c -o xxx.o xxx.c
Makefile:3: update target 'all' due to: target is .PHONY
:
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