Re: Yet another build styles issue
Re: Yet another build styles issue
- Subject: Re: Yet another build styles issue
- From: Alastair Houghton <email@hidden>
- Date: Wed, 12 Nov 2003 15:22:21 +0000
On 12 Nov 2003, at 15:15, Dario Accornero wrote:
> On 12 Nov 2003, at 15:44, Alastair Houghton wrote:
>
>>> This is unbelievable -- in this situation, gcc 3.3 is actually being
>>> fed the "-g -Os" combination... I mean, seriously, how many people
>>> do use these two settings together? Stepping with gdb through code
>>> compiled with -O3 or -Os (and IMNSHO even -O1) is next to useless.
>>
>> No it isn't. It's very useful. One particular benefit is that by
>> testing with optimised code, you will expose bugs in your code that
>> will only show-up when the optimiser is enabled. Also, when building
>> with the optimiser enabled, you get a few extra warnings that don't
>> show up when the optimiser is turned-off (basically because GCC
>> doesn't do the necessary analysis unless it's optimising)... some of
>> these warnings are quite useful.
>
> If you can stand debugging in gdb with optimisations on, more power to
> you -- sometimes I find it uncomfortable even at -O1. As for the
> warnings, you will get them anyways in your Deployment build.
No you don't. You don't get "uninitialized variable" warnings unless
you are optimising (they need data flow analysis); you also don't get
the warning about automatic variables in functions where you've used
setjmp().
GCC's manual mentions this, here:
http://developer.apple.com/documentation/DeveloperTools/gcc-3.3/gcc/
Warning-Options.html
Kind regards,
Alastair.
[demime 0.98b removed an attachment of type application/pkcs7-signature which had a name of smime.p7s]
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