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Re: gcc 4.7.x and optimization flags


On 10/16/2012 1:31 AM, Dick Hollenbeck wrote:
On 10/15/2012 08:49 PM, Wayne Stambaugh wrote:

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.


Thanks for doing that.  Someday we might take it even further and compile 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.

Sounds reasonable. It would only apply to the source files that include the Boost polygon library. JP would have a better idea about which source files would need to be compiled with -O1. Since my -Wno-narrowing fix also applies to the Boost polygon library we could throw that in there as well. If JP doesn't have time, I'll take a look at it when I get a chance.



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