I went through google about this and found out that many projects like
Linux, PostgreSQL and others use -fno-strict-aliasing. And nobody could
determine if this affects optimnization, so we can use that flag as well
and in the meantime slowly change the code.
Zoran Vasiljevic wrote:
Hi
When you compile w/o debugging (i.e. with optimisation)
the GCC spits whole-lotta stuff like that:
tclthread.c:401: warning: dereferencing type-punned pointer will break
strict-aliasing rules
tclthread.c:401: warning: dereferencing type-punned pointer will break
strict-aliasing rules
The warning sems to trigger when a pointer is casted like this:
enum {
EAbsWaitIdx, EBroadcastIdx, ECreateIdx, EDestroyIdx, ESetIdx,
ESignalIdx, ETimedWaitIdx, EWaitIdx
} opt;
if (!GetArgs(interp, objc, objv, opts, 'e', ECreateIdx,
(int *) &opt, (void **) &condPtr)) {
return TCL_ERROR;
The "opt" and "condPtr" in GetArgs() are casted and it barks
at them. I cannot possibly imagine changing all code to
something like:
enum {
EAbsWaitIdx, EBroadcastIdx, ECreateIdx, EDestroyIdx, ESetIdx,
ESignalIdx, ETimedWaitIdx, EWaitIdx
} opt;
int myOpt = (int)opt;
if (!GetArgs(interp, objc, objv, opts, 'e', ECreateIdx,
&myOpt, (void **) &condPtr)) {
return TCL_ERROR;
This would mean lots of work and may introduce errors.
I've read that you can use (starting with gcc 3.3) -fno-strict-aliasing
which would remove those warnings. But also, somebody said that the
effect of the "-O2" is gone in such cases (haven't be able to verify)
What to do?
Any ideas?
Zoran
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