On Wed, 2019-01-23 at 18:35 +0200, Eli Zaretskii wrote: > I was surprised to see it complain and drop the a.h <- b dependency, > since it is an order-only dependency. Is this a bug? If not, what > kind of problems can happen due to such "circular" dependencies?
I don't think it's a bug. GNU make's internal dependency graph determines the order in which targets are built. It must be acyclical, otherwise make can never choose which target to build before others. In your example makefile you have a cycle: b -> t -> a.o -> a.h -, ^_____________________/ So make can never correctly choose which target to build first, without breaking the cycle. _______________________________________________ Bug-make mailing list Bug-make@gnu.org https://lists.gnu.org/mailman/listinfo/bug-make
