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When compiling on Ubuntu 20.04 with GCC 9.3.0 and glibc 2.31, I get:
In file included from ../src/libratbag-private.h:32,
from ../src/driver-sinowealth.c:24:
../src/libratbag-util.h: In function ‘asprintf_safe’:
../src/libratbag-util.h:154:7: warning: implicit declaration of function ‘vasprintf’; did you mean ‘vsprintf’? [-Wimplicit-function-declaration]
154 | rc = vasprintf(&result, fmt, args);
| ^~~~~~~~~
| vsprintf
This appears to be because <features.h> is being included by another
header before config.h has been included. If _GNU_SOURCE has not been
defined at that point, then the other macros that control whether
vasprintf is declared are not set correctly.
Include config.h right at the top of libratbag-private.h to ensure
that _GNU_SOURCE is defined before any system headers are included to
avoid this problem.