[ adding autoconf-patches ] * Ralf Wildenhues wrote on Sat, Jan 15, 2011 at 11:31:55AM CET: > Quoting parts of: > http://autobuild.josefsson.org/automake/log-201101150749395803000.txt
> I'm not quite sure why HP-UX make seems to trigger rebuild rules for > prerequisites that have the exact time stamps as targets (in this case, > config.status and subdir Makefile, but I also tried with a reduced > makefile), but it is not Posix conforming. Working around it properly > would probably require sleeping inside config.status (an obvious no-go), > and in practice it should not do more harm than updating some rules more > than necessary. Found it documented in HP-UX/IA 11.31 make(1): If no target names are specified on the command line, make updates the first target in the (first) makefile that is not an inference rule. A target is updated in two cases: firstly, if it depends on files that are newer than the target; secondly, if it depends on files that have same modification time as that of the target. Missing files are deemed to be out-of-date. [...] Anybody have a support contract to report this Posix violation upstream? OK to commit? Thanks, Ralf docs: HP-UX make remakes targets with same time stamps as prereqs * doc/autoconf.texi (Timestamps and Make): Document HP-UX 11.31 make issue with targets having the same time stamps as their prerequisites. Signed-off-by: Ralf Wildenhues <ralf.wildenh...@gmx.de> diff --git a/doc/autoconf.texi b/doc/autoconf.texi index 9f5494e..81664e4 100644 --- a/doc/autoconf.texi +++ b/doc/autoconf.texi @@ -20183,7 +20183,9 @@ Timestamps and Make date >dest-stamp @end example - +Apart from timestamp resolution, there are also differences in handling +equal timestamps. HP-UX @command{make} updates targets if it has the +same time stamp as one of its prerequisites, in violation of Posix rules. @c ======================================== Portable C and C++ Programming