build: don't clean __version__.py on 'make clean' in release tarballs
When running 'make clean' in an extracted release tarball, file
mercurial/__version__.py is removed, causing a subsequent install to
indicate 'version unknown'.
This problem was reported in the past [1] and a patch proposed in that mail,
but was never properly sent nor applied.
[1] http://selenic.com/pipermail/mercurial/2010-December/036249.html
--- a/Makefile Sat Aug 30 01:51:02 2014 +0200
+++ b/Makefile Tue Sep 02 11:28:44 2014 +0200
@@ -56,7 +56,8 @@
find contrib doc hgext i18n mercurial tests \
\( -name '*.py[cdo]' -o -name '*.so' \) -exec rm -f '{}' ';'
rm -f $(addprefix mercurial/,$(notdir $(wildcard mercurial/pure/[a-z]*.py)))
- rm -f MANIFEST MANIFEST.in mercurial/__version__.py hgext/__index__.py tests/*.err
+ rm -f MANIFEST MANIFEST.in hgext/__index__.py tests/*.err
+ if test -d .hg; then rm -f mercurial/__version__.py; fi
rm -rf build mercurial/locale
$(MAKE) -C doc clean