https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70765
--- Comment #2 from Mike Conlen <mike at conlen dot org> ---
If I compile with -O3 the compiler produces (as expected)
$ gcc -Wall -Wextra -Werror -save-temps -O3 -c test.c
test.c: In function 'try_to_fail':
test.c:25:2: error: 'data' is used uninitialized in this function
[-Werror=uninitialized]
arbitrary_function(data);
^
test.c: In function 'main':
test.c:25:2: error: 'data' is used uninitialized in this function
[-Werror=uninitialized]
test.c:18:7: note: 'data' was declared here
int *data;
^
cc1: all warnings being treated as errors
