Bug#701082: gcc-4.7: gcc generates incorrect code with -O2 compiling libffi example

[Philip Ashmore]

I did an
   apt-get -t experimental install gcc-4.7 gcc-4.8
and updated libffi
gcc -O0 -o ffi-test ffi-test.c -lffi
./ffi-test
Hello World!
This is cool!

gcc -O1 -o ffi-test ffi-test.c -lffi
./ffi-test
Hello World!
This is cool!

gcc -O2 -o ffi-test ffi-test.c -lffi
./ffi-test
Hello World!
Segmentation fault

ldd ffi-test
        linux-vdso.so.1 (0x00007fff80fff000)
        libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 
(0x00007f9ffbaca000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f9ffb71d000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f9ffbd0e000)


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