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The macros __BEGIN_DECLS and __END_DECLS are not conforming to
any standard, but are a custom extension of the glibc library. As
such, it may not be available in other libc implementations, with
one example being musl libc. So compiling libapparmor won't work
with a strictly standards-conforming library.
These macros are typically used for header files which might be
included in a C++ project. Depending on whether the header is
seen by a C or C++ compiler, it will hint that functions have C
linkage. The macros themselves are rather simple:
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS
# define __END_DECLS
#endif
To fix compilation with musl libc, simply expand those macros to
explicitly use `extern "C"`. This is already used in other parts
of apparmor and should thus be safe to use.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
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