On Jan 10, 2011, at 9:29 AMPST, Duncan Sands wrote:
> Hi Li Qingan,
>
>> Thanks for your last reply.
>> I have made a critical mistake when I stated my question in last email.
>> I built llvm in debug mode, but the NDEBUG seemed to be still defined,
such that
>> the -debug option is not enabled.
>> I have restated my configuration below.
>
> you need to configure with --enable-assertions
> In spite of the name, NDEBUG is not related to optimization or debugging
> symbols, it means that checking (aka assertions) are disabled. Probably
> it should be renamed to NASSERT
Use of the name NDEBUG to control assertions comes from the C++ (and C)
standards. I agree this was not a great choice but deviating from the standard
would be more confusing than helpful IMO.
> Ciao, Duncan.
>
>> Looking forwards to your reply.
>>
>>
>>
>>
>>
>> Hi Li Qingan,
>>
>>> I have built and installed llvm-2.8 in debug mode using:
>>>
>>>> SRC_DIR/configure --prefix=INS_DIR --enable-debug-runtime
--disable-optimized
>>> --enable-debug-symbols
>>>
>>>> make install
>>>
>>>
>>> It seems theNDEBUGcontrols a lot of print-out of debug information,
by using
>>> DEBUG() or dbgs().
>>>
>>> And it is said thatNDEBUGis in enabled in debug mode, but I find it
does not
>>> work and the -debug option is not recognized. How should I
enableNDEBUGor
>>> enable DEBUG() and dbgs()? Should I defineNDEBUGin the .cpp files
related,
>>> when I need the debug information?
>>
>> actually it is the opposite:NDEBUGis enabled when not in debug mode.
The "N" in
>> NDEBUGstands for "Not".
>>
>> Ciao, Duncan.
>> --
>> Best regards,
>>
>> Li Qingan
>>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20110110/097328b0/attachment.html>