[Help-glpk] Re: Building glpk with vs2008

[Luiz M. M. Bettoni]

Hi All,

>  I did not find the difference between /O2 and /Ox (please see some
>  benchmarks below). However, the code is about twice faster than
>  without any optimization flags.

Like VS2008 "/O2" and "/Ox", MinGW/GCC has the "-O2" and "-O3" flags.
(http://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Optimize-Options.html#Optimize-Options)
And, like Andrew in VS2008, i didn't  see performance difference between 
GCC -O2 and -O3, but a lot of warnings for using the -O3 flag can be 
found on the web. So, in MinGW/GCC builds may be a good idea mantain a 
good and safe "-O2" cflag.

When Xypron release an "/O2" version of winglpk i'll make some 
benchmarks again.

> > Have you created MinGW build files with ODBC
> > support? This would be helpful.
>  I didn't use ODBC. But after your point i've build glpk with ODBC
>  support from MinGW - and make a successful connect to an ms excel
>  database!

Xypron, the excel connection was a valid ODBC connection test? Can we 
say that ODBC support in GLPK MinGW/GCC build is OK?

Thanks!
Luiz Bettoni