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

From: Michael Felt
Subject: Re: [Lzip-bug] build issues - AIX and not gcc
Date: Sun, 12 Feb 2017 17:09:03 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Thunderbird/50.0

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.

-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.


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