This is from /usr/include/features.h which is provided by glibc. The
./configure, make build that ffmpeg uses only generates a warning but
for some reason Chromium's ninja + clang build system generates an
error.
/* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for
_DEFAULT_SOURCE. If _DEFAULT_SOURCE is present we do not
issue a warning; the expectation is that the source is being
transitioned to use the new macro. */
#if (defined _BSD_SOURCE || defined _SVID_SOURCE) \
&& !defined _DEFAULT_SOURCE
# warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
# undef _DEFAULT_SOURCE
# define _DEFAULT_SOURCE 1
#endif
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