URL:
<https://savannah.gnu.org/bugs/?62228>
Summary: prerequisite based on input file created during
processing not created, but no error
Project: make
Submitted by: minshall
Submitted on: Tue 29 Mar 2022 04:38:56 AM UTC
Severity: 3 - Normal
Item Group: None
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:
hi. sorry. i'm not sure if this is a bug.
in the makefile below, the initial condition should be that ./outputs is
empty, but ./inputs includes a file ./inputs/a.input. the main goal causes
./inputs/b.input to be created. a pattern rule should convert
./inputs/%.input to ./outputs/%.output. and, the sub-goal `processoutputs`
has as prerequisites `${OUTFILES}`, created by text-munging of the files
(then) in ./inputs. so, when this goal is executed, that includes
./outputs/b.output. but, ./outputs/b.output is *not* created (which seems
consistent with verbiage in the info pages), *and*, no error is generated
saying "no rule to make ./outputs/b.output..." (or, words to that effect).
the fact that `${OUTFILES}`, when the `diff` command is invoked, includes
./outputs/b.output makes me wonder if there is a bug here?
(but, i'm guessing that dependencies are built when the makefile is read, then
not updated?)
cheers.
INDIR = ./inputs
OUTDIR = ./outputs
INFILES = $(notdir $(shell ls ${INDIR}/*.input))
INFILESASOUT = $(INFILES:.input=.output)
OUTFILES = $(addprefix ${OUTDIR}/,$(notdir ${INFILESASOUT}))
NEWIN = ${INDIR}/b.input
NEWOUT = ${OUTDIR}/b.output
${OUTDIR}/%.output: ${INDIR}/%.input
echo creating $(notdir $@)
cp -p $< $@
.PHONY: all setup processoutputs something clean
all: setup something processoutputs
setup:
@for dir in ${OUTDIR} ${INDIR}; do \
if [ ! -e $${dir} ]; then mkdir $${dir}; fi \
done
@if [[ -f ${NEWIN} ]]; then \
echo error: "${NEWIN} exists -- run \`make clean\`"; \
exit 1; \
fi
# this wants, as dependency,
processoutputs: ${OUTFILES}
@diff <(for i in ${OUTFILES}; do echo $$i; done) <(ls ${OUTDIR}/*)
something:
@touch ${NEWIN}
clean:
@-rm -f ${OUTFILES}
@-rm -f ${NEWIN}
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