One of my developers reported that our product's build fails with GNU
make >= 3.82.
I discovered the root cause of the issue was that we had order only
prerequisites of directories with trailing slashes, but the targets
used to create those directories did not.
In our framework, these differences result from a twisted maze of $(call
...) and $(eval ...) expansions; but this simple Makefile demonstrates
the issue:
foo/bar: | foo/
touch $@
foo:
mkdir $@
With GNU make 3.81 (as distributed by Ubuntu 14.04):
$ make --version
GNU Make 3.81
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
This program built for x86_64-pc-linux-gnu
$ make
mkdir foo
touch foo/bar
With GNU make 3.82 (built from source on the same system):
$ make --version
GNU Make 3.82
Built for x86_64-unknown-linux-gnu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ make
make: *** No rule to make target 'foo/', needed by 'foo/bar'. Stop.
I've checked the NEWS file and did not see this listed among the
backwards-incompatible changes.
Was this change intentional? To some extent, it doesn't matter, as I'll
need change our makefile framework to strip trailing slashes for current
GNU make versions regardless.
Thanks,
--jtc
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