From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7b)
Gecko/20040309

Description of problem:
when checking a const pointer, a NULL can be treated as "true" when
-Os optimization is used.  As in the testcase I'll attach:

const char *tray_name=NULL;
...
if (tray_name) {
   // this branch is executed
}
else {
   // this branch should be executed
}

Version-Release number of selected component (if applicable):
3.3.3-2.1

How reproducible:
Always

Steps to Reproduce:
1. grab to-be-attached testcase
2. gcc -o test -Os test.c
3. ./test
    

Actual Results:  "oops"

Expected Results:  "yay"

Additional info:

this bug also occurs in FC1 gcc (3.2.2-1) and resulted in the Mozilla
bug here:
http://bugzilla.mozilla.org/show_bug.cgi?id=233497

Adding -fno-gcse fixes the testcase.  I tried out gcc34-3.4.0-0.6, and
it handles the testcase properly.