Eugeniu Rosca [off-list ref] wrote:

How about arm64? Do you intend to enable cross-compilation?

There's no guarantee that a cross-compiler can actually build userspace apps,
though I haven't intended to encode anything against that in the Makefile.

quoted

+			asm ("lfence" : : : "memory" );

[..]

quoted

+			asm("mfence" ::: "memory");

FWIW, trying to cross-compile it returned:

aarch64-linux-gnu-gcc -I../../usr/include -I../../include  watch_test.c   -o watch_test
/tmp/ccDXYynm.s: Assembler messages:
/tmp/ccDXYynm.s:471: Error: unknown mnemonic `lfence' -- `lfence'
/tmp/ccDXYynm.s:568: Error: unknown mnemonic `mfence' -- `mfence'

Yeah.  I need to use C-standard __atomic_* stuff.

David