After doing a full build, running build.sh again rebuilds many modules. When installing headers and libraries the second time, the timestamp are not preserved. This is not unique to xorg, jhbuild has written a C install program which preserves timestamp (util/install-check). However it only deals with header files. Another solution is to use the automake install-sh script which is portable. There is a comment to the effect that the script is slower. I have used it in the proto directories for all extensions. For a few files to copy, there is no performance issue. GNU takes care of maintenance and portability. This is implemented with the following line in configure.ac: AC_SUBST([INSTALL], ['$(install_sh) -c -C']) This must have been tried in the past (or at least in other projects). I'd like to collect this information in this bug report.
(In reply to comment #0) > AC_SUBST([INSTALL], ['$(install_sh) -c -C']) just a comment here - my manpage says that -c is ignored.
(In reply to comment #1) > (In reply to comment #0) > > AC_SUBST([INSTALL], ['$(install_sh) -c -C']) > > just a comment here - my manpage says that -c is ignored. > Correct. The GNU install executable program ignores the -c option. Automake always invokes it with -c option. The install-sh script also ignores it. I used it for two reasons. To follow the tradition and to make it clear that -C is important and is not a typo of -c. I just realized I made a typo in configure.ac, it's "-sh" and not "_sh", but configure changed it. Thanks
On Fri, 2009-10-16 at 11:05 -0700, bugzilla-daemon@freedesktop.org wrote: > After doing a full build, running build.sh again rebuilds many modules. When > installing headers and libraries the second time, the timestamp are not > preserved. > > This is not unique to xorg, jhbuild has written a C install program which > preserves timestamp (util/install-check). However it only deals with header > files. Another solution is to use the automake install-sh script which is > portable. Then why does X need to work around this, as opposed to filing a wishlist request to gnu install and leaving it at that? Seems like a lot of work for this...
(In reply to comment #3) > On Fri, 2009-10-16 at 11:05 -0700, bugzilla-daemon@freedesktop.org > wrote: > > After doing a full build, running build.sh again rebuilds many modules. When > > installing headers and libraries the second time, the timestamp are not > > preserved. > > > > This is not unique to xorg, jhbuild has written a C install program which > > preserves timestamp (util/install-check). However it only deals with header > > files. Another solution is to use the automake install-sh script which is > > portable. > > Then why does X need to work around this, as opposed to filing a > wishlist request to gnu install and leaving it at that? Seems like a > lot of work for this... > It looks like this was settled in 2006: http://lists.gnu.org/archive/html/automake/2006-12/msg00053.html I forgot to mention that the "install" executable program has an option to preserve timestamp, bit it is commented as not being portable. It looks like the prevaling scenario is performance during installation rather than performance during build. In any case, we would still need to add a line in configure.ac. We only need to to do that for modules upon which other depends.
So then can this be closed? If not, what needs to be done?
On hold for the foreseeable future.
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