why not optimize static local variables

[Hanke Zhang via Gcc]

Hi, I've recently been working on static local variables in C. I would
like to ask about some questions about that.

For example, for the following program,

void foo() {
  static int x = 0;
  x++;
}

int main() {
  foo();
}

After optimization with the -O3 -flto option, the entire program will
look something like this:

int main() {
  x_foo++;
}

The question I want to ask is, why not optimize the 'x_foo++' line of
code out? Because its scope will only be in foo, and it will not be
read at all for the entire program. Is it because it is stored in the
global data area? Or are there other security issues?

Thanks
Hanke Zhang

gcc-13-20231007 is now available

[GCC Administrator via Gcc]

Snapshot gcc-13-20231007 is now available on
  https://gcc.gnu.org/pub/gcc/snapshots/13-20231007/
and on various mirrors, see http://gcc.gnu.org/mirrors.html for details.

This snapshot has been generated from the GCC 13 git branch
with the following options: git://gcc.gnu.org/git/gcc.git branch 
releases/gcc-13 revision add2afa9e25f1776fdfbeb1b99fd1efcf850f91f

You'll find:

 gcc-13-20231007.tar.xz   Complete GCC

  SHA256=1769946861777585db174aac0e4c9993a1e62e04a29e80aa119981632c68c369
  SHA1=44aabe0f255cf03eeb18b29820aeb19824ed10f6

Diffs from 13-20230930 are available in the diffs/ subdirectory.

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