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Date: Thu, 11 Sep 2014 13:00:09 +0200
From: Jörg Krause <jkrause@...teo.de>
To: musl@...ts.openwall.com
Subject: why is there no __MUSL__ macro?
Hi,
I am trying to add support for the musl toolchain to FFmpeg.
FFmpeg needs support for library features defined in POSIX.1-2001 with
XSI extension and the standards below. Currently configure probes the
host and target libc by checking for defined macros like __GLIBC__ and
__UCLIBC__. In case of glibc and uclibc it sets -D_XOPEN_SOURCE=600
properly.
After this it checks for some combinations of hardware and the probed
libc to set some more compile options, if necessary.
I know that musl does not have a macro __MUSL__ and I have read the
explanation. However, I don't understand what's meant by "[..] it's a
bug to assume a certain implementation has particular properties rather
than testing." and how does it affect the way FFmpeg probes for the libc.
What could be a solution which supports musl?
Many thanks!
Jörg
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