问Windows Bash - Emacs构建失败:启用内存保护

EN

Dumping under the name emacs
**************************************************
Warning: Your system has a gap between BSS and the
heap (25164600 bytes).  This usually means that exec-shield
or something similar is in effect.  The dump may
fail because of this.  See the section about
exec-shield in etc/PROBLEMS for more information.
**************************************************
/bin/bash: line 7:  6853 Segmentation fault      (core dumped) ./temacs --batch --load loadup bootstrap
make[1]: *** [bootstrap-emacs] Error 1
make[1]: Leaving directory `/home/tdwyer/bin/emacs-24.5_linux_build/src'
make: *** [src] Error 2

*** Segfault during `make bootstrap' under the Linux kernel.

In Red Hat Linux kernels, "Exec-shield" functionality is enabled by
default, which creates a different memory layout that can break the
emacs dumper.  Emacs tries to handle this at build time, but if this
fails, the following instructions may be useful.

Exec-shield is enabled on your system if

    cat /proc/sys/kernel/exec-shield

prints a value other than 0.  (Please read your system documentation
for more details on Exec-shield and associated commands.)

Additionally, Linux kernel versions since 2.6.12 randomize the virtual
address space of a process by default.  If this feature is enabled on
your system, then

   cat /proc/sys/kernel/randomize_va_space

prints a value other than 0.

When these features are enabled, building Emacs may segfault during
the execution of this command:

    ./temacs --batch --load loadup [dump|bootstrap]

To work around this problem, you can temporarily disable these
features while building Emacs.  You can do so using the following
commands (as root).  Remember to re-enable them when you are done,
by echoing the original values back to the files.

    echo 0 > /proc/sys/kernel/exec-shield
    echo 0 > /proc/sys/kernel/randomize_va_space

Or, on x86, you can try using the `setarch' command when running
temacs, like this:

    setarch i386 -R ./temacs --batch --load loadup [dump|bootstrap]

or

    setarch i386 -R make

(The -R option disables address space randomization.)

$ cat /proc/sys/kernel/randomize_va_space
2

$ sudo echo 0 > /proc/sys/kernel/randomize_va_space
bash: /proc/sys/kernel/randomize_va_space: Permission denied

setarch x86_84 -R make