On 11/11/2014 10:59 AM, fr33domlover wrote: >>> The first form of expansion on that page, $(var:.a=.b), should be OK. >>> They are standard in POSIX and work on all make implementations that I >>> know of. >>> >>> The version with % characters is not portable. >> >> That said, POSIX is hoping to standardize it in the next few years: >> >> http://austingroupbugs.net/view.php?id=519 >> > > Hmmm I was sure it's portable because `make distcheck` doesn't complain about > the %s, and I'm using -Werror and -Wall automake flags. How bad is it? I > suppose it's not specific to just GNU make alone?
automake can't warn about all non-portable aspects, although patches to make it warn about more cases would be welcome. And the fact that POSIX is planning to standardize % substitutions in make is a sign that existing implementations that already support it are in agreement (more than just GNU make), so if you want to be on the leading edge of the curve, you aren't excluding that many users. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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