Seems like a lot of things just started to fail to build on aarch64.
I also get the following only for aarch64:
/usr/bin/ld: index.lib.o: in function `IndexBase::clear(void (*)(void*, int))':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/index.cc:48: undefined reference to
`__aarch64_ldadd8_acq_rel'
/usr/bin/ld: index.lib.o: in function `IndexBase::insert(int, int)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/index.cc:86: undefined reference to
`__aarch64_ldadd8_acq_rel'
/usr/bin/ld: ringbuf.lib.o: in function `RingBufBase::alloc(int)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/ringbuf.cc:60: undefined reference to
`__aarch64_ldadd8_acq_rel'
/usr/bin/ld: ringbuf.lib.o: in function `RingBufBase::destroy(void (*)(void*, int))':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/ringbuf.cc:84: undefined reference to
`__aarch64_ldadd8_acq_rel'
/usr/bin/ld: strpool.lib.o: in function `String::raw_ref(char const*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/strpool.cc:143: undefined reference
to `__aarch64_ldadd4_acq_rel'
/usr/bin/ld: strpool.lib.o: in function `String::raw_unref(char*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/strpool.cc:160: undefined reference
to `__aarch64_ldadd4_acq_rel'
/usr/bin/ld: /builddir/build/BUILD/audacious-4.0.3/src/libaudcore/strpool.cc:163:
undefined reference to `__aarch64_cas4_acq_rel'
/usr/bin/ld: strpool.lib.o: in function `Getter::found(StrNode*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/strpool.cc:98: undefined reference to
`__aarch64_ldadd4_acq_rel'
/usr/bin/ld: strpool.lib.o: in function `Remover::found(StrNode*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/strpool.cc:109: undefined reference
to `__aarch64_cas4_acq_rel'
/usr/bin/ld: tinylock.lib.o: in function `tiny_lock(char*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tinylock.cc:29: undefined reference
to `__aarch64_swp1_acq'
/usr/bin/ld: tinylock.lib.o: in function `tiny_lock_read(unsigned short*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tinylock.cc:37: undefined reference
to `__aarch64_ldadd2_acq_rel'
/usr/bin/ld: /builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tinylock.cc:39:
undefined reference to `__aarch64_ldadd2_acq_rel'
/usr/bin/ld: tinylock.lib.o: in function `tiny_unlock_read(unsigned short*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tinylock.cc:46: undefined reference
to `__aarch64_ldadd2_acq_rel'
/usr/bin/ld: tinylock.lib.o: in function `tiny_lock_write(unsigned short*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tinylock.cc:52: undefined reference
to `__aarch64_cas2_acq_rel'
/usr/bin/ld: tinylock.lib.o: in function `tiny_unlock_write(unsigned short*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tinylock.cc:58: undefined reference
to `__aarch64_ldadd2_acq_rel'
/usr/bin/ld: tuple.lib.o: in function `TupleData::ref(TupleData*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tuple.cc:391: undefined reference to
`__aarch64_ldadd4_acq_rel'
/usr/bin/ld: tuple.lib.o: in function `TupleData::unref(TupleData*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tuple.cc:398: undefined reference to
`__aarch64_ldadd4_acq_rel'
/usr/bin/ld: tuple.lib.o: in function `TupleData::copy_on_write(TupleData*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tuple.cc:407: undefined reference to
`__aarch64_ldadd4_acq_rel'
/usr/bin/ld: tuple.lib.o: in function `TupleData::unref(TupleData*)':
/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tuple.cc:398: undefined reference to
`__aarch64_ldadd4_acq_rel'
/usr/bin/ld: /builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tuple.cc:398: undefined
reference to `__aarch64_ldadd4_acq_rel'
/usr/bin/ld:
tuple.lib.o:/builddir/build/BUILD/audacious-4.0.3/src/libaudcore/tuple.cc:391: more
undefined references to `__aarch64_ldadd4_acq_rel' follow
collect2: error: ld returned 1 exit status
Failed to link libaudcore.so!