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Date: Thu, 11 Sep 2014 13:00:09 +0200
From: Jörg Krause <>
Subject: why is there no __MUSL__ macro?


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 

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!

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