Re: [Lzip-bug] build issues - AIX and not gcc

[Michael Felt]

On 12/02/2017 16:46, Antonio Diaz Diaz wrote:
> Michael Felt wrote:
> > So, calling it as you recommend - still get unworkable CXXFLAGS (-W
> > means something different for xlc++)
>
> Thanks for reporting this. Until now all compilers reported accepted 
> -W. I have now removed -W from the default CXXFLAGS for non-g++ 
> compilers. The other option (-O) is POSIX, so I guess it is OK.
FYI:
-O2 is the recommended "safe" optimization setting for xlc(++), -O3 can 
make some changes to increase optimizations (make check become more 
important). My understanding is that -O3 is the gcc equivalent of xlc -O2.

If I understand correctly - for gcc -W is to report all warning 
messages. The default setting for xlc (report all: info, warn, syntax 
(error)) messages.
I usually redirect stdout to a file and only see warning and error 
messages on stderr.

> Thanks,
> Antonio.
>
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