https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117455
--- Comment #6 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Info:
-ftrampoline-impl=[stack|heap]
By default, trampolines are generated on stack. However, certain platforms
(such as the Apple M1) do not permit an executable stack. Compiling with
-ftrampoline-impl=heap generate calls to __gcc_nested_func_ptr_created and
__gcc_nested_func_ptr_deleted in order to allocate and deallocate trampoline
space on the executable heap. These functions are implemented in libgcc, and
will only be provided on specific targets: x86_64 Darwin, x86_64 and aarch64
Linux. PLEASE NOTE: Heap trampolines are not guaranteed to be correctly
deallocated if you setjmp, instantiate nested functions, and then longjmp back
to a state prior to having allocated those nested functions.
Is there a security issue? Above my pay range to answer.
Should this just be the gfortran default where applicable?
$ gfc test1.f90
/usr/bin/ld: warning: /tmp/ccOTgxKq.o: requires executable stack (because the
.note.GNU-stack section is executable)
$ gfc -ftrampoline-impl=heap test1.f90
$
