[Bug c/47409] volatile struct member bug

[regehr at cs dot utah.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47409

--- Comment #9 from John Regehr <regehr at cs dot utah.edu> 2013-01-30 04:36:01 UTC ---
Just wanted to ping about this one; it's still there in tonight's GCC.

regehr@home:~$ cat vol.c
struct s2 {
  volatile int x;
};

struct s2 s;

void foo (void) {
  s = s;
}
regehr@home:~$ gcc -O0 vol.c -c
regehr@home:~$ objdump -d vol.o

vol.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <foo>:
   0:    55                       push   %rbp
   1:    48 89 e5                 mov    %rsp,%rbp
   4:    5d                       pop    %rbp
   5:    c3                       retq   
regehr@home:~$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/regehr/z/compiler-install/gcc-r195565-install/libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/regehr/z/compiler-source/gcc/configure
--with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r195565-install
--enable-languages=c,c++
Thread model: posix
gcc version 4.8.0 20130129 (experimental) (GCC)