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mk: rebuild if goflags or ldflags have changed

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Running make with different values for GOFLAGS or VERSION does not cause
aerc to be rebuilt whereas it should.

Write the go build command line into a file and force aerc to be rebuilt
if the command line has changed.

Use the BSD make compatible != operator to run the command. This
operator is also available in GNU make since version 4.0.

Link: https://git.savannah.gnu.org/cgit/make.git/commit/?id=b34438bee83ee
Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Koni Marti <koni.marti@gmail.com>
This commit is contained in:
Robin Jarry 2022-02-23 20:27:09 +01:00
parent 115dabb634
commit e7e22aba60
2 changed files with 14 additions and 2 deletions
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1
.gitignore vendored
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@ -2,6 +2,7 @@
/aerc2
/aerc
/aerc.debug
/.aerc.d
log
raw.log
*.1

15
Makefile
View file

@ -30,8 +30,19 @@ DOCS := \
all: aerc $(DOCS)
aerc: $(GOSRC)
$(GO) build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o $@
build_cmd:=$(GO) build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o aerc
# the following command outputs nothing, we only want to execute it once
# and force .aerc.d to be regenerated when build_cmd has changed
_!=echo '$(build_cmd)' > .aerc.tmp; \
cmp -s .aerc.d .aerc.tmp || rm -f .aerc.d; \
rm -f .aerc.tmp
.aerc.d:
@echo '$(build_cmd)' > $@
aerc: $(GOSRC) .aerc.d
$(build_cmd)
.PHONY: fmt
fmt: