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Re: gcc 4.7.x and optimization flags


On 10/16/2012 12:31 AM, Dick Hollenbeck wrote:
> On 10/15/2012 08:49 PM, Wayne Stambaugh wrote:
>> Dick,
>> I just committed a fix so that the only time -O1 is only used when the 
>> GCC version is >= 4.7.  When you get a chance, please test it out to 
>> make sure it works with GCC versions < 4.7.  Both my Linux and Windows 
>> build environments are using GCC >= 4.7.  I suppose I could install an 
>> older version of GCC on Linux when I get chance.
>> Wayne
> Thanks for doing that.  Someday we might take it even further and compile on

only (not on)

>  those certain
> needed files under 4.7.x that must be done with -O1, others with -O2.
> This is easier than it sounds since gcc will ignore all but the right most optimization
> setting on the command line.
> So really, you just have to set set_source_file_properties() on a few files and pass in
> the -O1 as COMPILE_FLAGS or such (don't hold me on spelling), and as long as CMake appends
> that to other stuff, then -O1 will prevail on only those files.
> Dick