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build: submodule machinery now works also when no tag is reachable

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The code in cfg.mk to detect when the git submodule was out of date
worked most of the time, but not when checked out in a certain way.
* cfg.mk: Extract submodule hash from command output and file,
and compare only that, since the format of the full line may vary.
Reported by Mike Burns, with some diagnosis by Daniel P Berrange.
This commit is contained in:
Jim Meyering 2009-07-15 09:54:26 +02:00
parent 0714b2ba4c
commit 8f84fef2eb
1 changed files with 11 additions and 3 deletions
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14
cfg.mk
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@ -242,9 +242,17 @@ prev_version_file = /dev/null
ifeq (0,$(MAKELEVEL))
_curr_status = .git-module-status
_update_required := \
$(shell t=$$(git submodule status); \
test "$$t" = "$$(cat $(_curr_status) 2>/dev/null)"; echo $$?)
# The sed filter accommodates those who check out on a commit from which
# no tag is reachable. In that case, git submodule status prints a "-"
# in column 1 and does not print a "git describe"-style string after the
# submodule name. Contrast these:
# -b653eda3ac4864de205419d9f41eec267cb89eeb .gnulib
# b653eda3ac4864de205419d9f41eec267cb89eeb .gnulib (v0.0-2286-gb653eda)
_submodule_hash = sed 's/.//;s/ .*//'
_update_required := $(shell \
actual=$$(git submodule status | $(_submodule_hash)); \
stamp="$$($(_submodule_hash) $(_curr_status) 2>/dev/null)"; \
test "$$stamp" = "$$actual"; echo $$?)
ifeq (1,$(_update_required))
$(error gnulib update required; run ./autogen.sh first)
endif