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Paul Eggert authored
This is needed for gcc -Os -flto on x86-64; otherwise, GC misses part of the stack when scanning for heap roots, causing Emacs to crash later (Bug#28213). The problem is that Emacs's hack for getting an address near the stack top does not work when link-time optimization moves stack variables around. * configure.ac (HAVE___BUILTIN_FRAME_ADDRESS): New macro. * lib-src/make-docfile.c (DEFUN_noinline): New constant. (write_globals, scan_c_stream): Support noinline. * src/alloc.c (NEAR_STACK_TOP): New macro. (SET_STACK_TOP_ADDRESS): Use it. (flush_stack_call_func, Fgarbage_collect): Now noinline.
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