Pulseaudio fails to build on the Alpha architecture due to a failure in the volume-test of the test suite. I had reported this to the Debian bug tracker [1] but the maintainer has asked that I forward the patch to this mail list. The failure in volume-test occurs because it is compiled with -ffast-math which implies -ffinite-math-only of which the gcc manual states that it optimizes for floating-point arithmetic with the assumption that arguments and results are not NaNs or +/-infinity, and futher notes that it may result in incorrect output. On the Alpha platform that is somewhat an understatement as the use of non-finite floating-point arithmetic with -ffinite-math-only results in a floating-point exception and the termination of the program. The volume-test converts volumes into decibels (so a zero volume becomes a negative infinity) and proceeds to add two volumes (in decibels), thus does arithmetic with non-finite floating point numbers despite being compiled with -ffast-math! I attach a patch that protects against the arithmetic with non-finite numbers for your consideration. With that patch the test-suite passes on Alpha. Cheers Michael. [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=798248 -------------- next part -------------- A non-text attachment was scrubbed... Name: dont-add-infinities-with-ffast-math.patch Type: text/x-diff Size: 558 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20150909/7686e19b/attachment.patch>
