[uclibc-ng-devel] Unwinding info for cancellable syscalls

Hello, I've noticed that several NPTL tst-cancelx* tests fail on ARM, because functions invoking cancellable syscalls are compiled without -fasynchronous-unwind-tables making it impossible for the libgcc DWARF unwinder to unwind stack past the syscall and call the cleanup routine. They work on x86_64, because x86_64 gcc has -fasynchronous-unwind-tables enabled by default, and on xtensa because it uses custom unwinding code. I haven't checked, but AFAIU it should fail on other architectures that use DWARF unwinder. Can anybody confirm that? I guess that at least all functions that invoke cancellable syscalls need to be built with -fasynchronous-unwind-tables in their CFLAGS. I've tried that with couple of functions and it fixes corresponding tests. And that's what glibc does in nptl/Makefile. Does that sound right for uClibc? -- Thanks. -- Max