In the manual, we are given the following pattern for using help2man
without breaking make distcheck:
foo.1: foo.c $(top_srcdir)/configure.ac
$(MAKE) $(AM_MAKEFLAGS) foo$(EXEEXT)
help2man --output=foo.1 ./foo$(EXEEXT)
The problem is that with make -j this can result in two attempts to make a
library in parallel (suppose that we have:
foo_LDADD = libfoo.la
lib_LTLIBRARIES = libfoo.la
). This can fail, and in any case is wasteful.
I'm using automake 1.15. I can't see anything since then that fixes this
problem.
The best workaround I could come up with was to revert the dependency to
foo.1: foo$(EXEEXT)
and then set distcleancheck_listfiles appropriately. Obviously, since this
could hide other problems in the build system, it's not ideal.
Am I missing a better solution? If so, it should be added to the manual. If
not, this problem should probably be documented. I'm finding that parallel
make is becoming a must-have rather than a nice boost, given the
proliferation of slow multi-core machines (for example: -j makes it
feasible to hack on my phone; without it, builds are painfully slow).
--
https://rrt.sc3d.org
