Date: Fri, 14 Dec 2012 14:55:02 -0500 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: spandsp testsuite, feenableexcept() is missing On Fri, Dec 14, 2012 at 11:49:26PM +0400, ojab wrote: > On 14.12.2012 22:58, Rich Felker wrote: > >On Fri, Dec 14, 2012 at 06:30:28PM +0400, ojab wrote: > >>>Hi list, > >>> > >>>spandsp testsuite build fails with > >>>> >/root/spandsp/tests/v17_tests.c:311: undefined reference to `feenableexcept' > >>> > >>>AFAIU all functions from fenv.h are not implemented. Is there plans > >>>to implement them before 1.0/at all? > >fenv.h is implemented. The issue is that feenableexcept is not part of > >the standard for fenv.h; it's an extension added by glibc for turning > >on trapping exceptions. This usage is non-portable (as far as I know, > >many machines don't support trapping exceptions) and I've never seen a > >program actually making use of them. It looks like spandsp is just > >using this function in its test suite, probably to test some > >exception-relted behavior. I think this should be fixed upstream, > >since it won't work on other non-GNU systems either. > > > > Ouch, stupid me, I thought that I've checked posix about it. > Sorry for the noise. No problem. It's still useful to have a record that at least some program was trying to use it, even if only for testing purposes; it helps evaluate whether it would ever make sense to add it. However, if you're going to support trapping exceptions, there are a few fenv functions which become slightly more complicated or more expensive, and as long as nothing actually wants trapping exceptions, I think it makes the most sense just to say "they're not supported and we offer no interface to turn them on"; then, the rest of fenv can safely assume they're off. Rich
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