Chapter 2 of "FreeBSD Developers' Handbook":
| 2.4 Compiling with cc
|
| -O
| Create an optimized version of the executable. The compiler
| performs various clever tricks to try and produce an executable | that runs faster than normal. You can add a number after the -O
| to specify a higher level of optimization, but this often exposes
| bugs in the compiler's optimizer. For instance, the version of cc
| that comes with the 2.1.0 release of FreeBSD is known to produce
| bad code with the -O2 option in some circumstances.
|
| Optimization is usually only turned on when compiling a release
| version.
|[...]
HUH?!? "the version of cc that comes with 2.1.0" has those -O bugs???? Good grief, we're running 5.x (-Current, actually)! I can't find any mention of any such bugs with GCC 3.x on i386.
Unless there is evidence of more recent gcc bugs, that part of the handbook should really be removed.
I can easily imagine the reaction on this list if the reverse were true, and the gcc handbook was knocking FreeBSD for a bug in release 3.0 (or whatever).
Richard Coleman [EMAIL PROTECTED]
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