[Bug target/38052] [4.4 Regression] genautomata segfaults when -O2 is enabled

[r0bertz at gentoo dot org]

------- Comment #5 from r0bertz at gentoo dot org  2008-11-13 17:27 -------
I am trying to find which specific flag or flags when used together with
-foptimize-sibling-calls could trigger this problem.
As the first step I tried to find a set of flags used together with -O0 and
-foptimize-sibling-calls could trigger this problem. Presumably this set of
flags should be those disabled at -O0 but enabled at -O1.

So I did the following to find the differences:
gcc -c -Q -O0 --help=optimizers > /tmp/O0-opts
gcc -c -Q -O1 --help=optimizers > /tmp/O1-opts
diff /tmp/O0-opts /tmp/O1-opts | grep enabled | cut -d " " -f 4

Then I used these flags with -O0 and -foptimize-sibling-calls together, but
this didn't trigger the bug.

Is there anything I have overlooked here?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38052