From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pete Wyckoff <pw@padd.com>
Subject: Re: [PATCH 3/8] git_remote_helpers: Force rebuild if python version
 changes
Date: Sat, 12 Jan 2013 18:30:44 -0500
Message-ID: <20130112233044.GB23079@padd.com>
References: <cover.1358018078.git.john@keeping.me.uk>
 <89f55d20da9a4c0a8490f95107cbf5d04219d0fb.1358018078.git.john@keeping.me.uk>
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Cc: git@vger.kernel.org, "Eric S. Raymond" <esr@thyrsus.com>,
	Felipe Contreras <felipe.contreras@gmail.com>,
	Sverre Rabbelier <srabbelier@gmail.com>
To: John Keeping <john@keeping.me.uk>
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john@keeping.me.uk wrote on Sat, 12 Jan 2013 19:23 +0000:
> When different version of python are used to build via distutils, the
> behaviour can change.  Detect changes in version and pass --force in
> this case.
[..]
> diff --git a/git_remote_helpers/Makefile b/git_remote_helpers/Makefile
[..]
> +py_version=$(shell $(PYTHON_PATH) -c \
> +	'import sys; print("%i.%i" % sys.version_info[:2])')
> +
>  all: $(pysetupfile)
> -	$(QUIET)$(PYTHON_PATH) $(pysetupfile) $(QUIETSETUP) build
> +	$(QUIET)test "$$(cat GIT-PYTHON_VERSION 2>/dev/null)" = "$(py_version)" || \
> +	flags=--force; \
> +	$(PYTHON_PATH) $(pysetupfile) $(QUIETSETUP) build $$flags
> +	$(QUIET)echo "$(py_version)" >GIT-PYTHON_VERSION

Can you depend on ../GIT-PYTHON-VARS instead?  It comes from
96a4647 (Makefile: detect when PYTHON_PATH changes, 2012-12-18).
It doesn't check version, just path, but hopefully that's good
enough.  I'm imagining a rule that would do "clean" if
../GIT-PYTHON-VARS changed, then build without --force.

		-- Pete