[bug #66089] On macos mprotect can't be PROT_WRITE and PROT_EXEC at the same time

[Bruno Haible]

Follow-up Comment #3, bug #66089 (group libffcall):

Lorenzo Daneo wrote in
https://lists.gnu.org/archive/html/libffcall/2024-08/msg00003.html :
> the installation with brew was going in error at line 87 in trampoline.c

On macOS, HAVE_MMAP_SHARED_CAN_EXEC is supposed to be defined to 1.

Can you please look in the config.log what happened to the "checking whether a
shared mmap can make memory pages executable..." test? This test ought to
succeed.

> compiled locally with HAVE_MPROTECT_AFTER_MMAP_CAN_EXEC set to 1

This won't work. The reason HAVE_MMAP_SHARED_CAN_EXEC was introduced is that,
precisely, mprotect (PROT_READ|PROT_WRITE|PROT_EXEC) does not work on macOS
and some other operating systems.



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