On Tue, Aug 28, 2012 at 10:13 AM, David Wolfskill <[email protected]>wrote:
> On Tue, Aug 28, 2012 at 05:53:15PM +0100, Jamie Paul Griffin wrote: > > ... > > Thanks David, that's helpful information. > > Good; that was the intent. :-) > > > I'll likely give it a go. So does clang create better binaries and > libraries, in terms of performance and such-like? I'm currently reading as > much as I can find about clang and its associated tools; however, compilers > are quite complex software and learning about them is, for me at least, a > lot to take in. > > .... > > I don't know that it creates "better" code, but I believe that at least > some of its error/warning checking may be a bit better: it certainly > whines about a fair bit of GNUish code, citing (e.g.) "Tautological > compares" ... and that sort of thing seems as if it's something I'd want > to know about if it were my code, so I could fix it. > > From the time (a few weeks) when I was building stable/9 with both gcc & > clang (on different slices, sources updated to the same GRN), I got the > impression that clang was slower (to compile) than gcc was. > > I note that I've had no issues at all with interoperation of executables > & libraries built with gcc & clang. I consider this a Good Thing. :-) > > As I understand the issues, FreeBSD uses a (somewhat modified) version > of the last GPLv2-licensed version of gcc, and there is strong incentive > to avoid "tainting" FreeBSD with a GPLv3-licensed version of gcc. > > Thus, if we want to be able to move forward with our "system compiler," > we have little choice but to use something other than gcc. clang > appears to work, so I plan to exercise it & report issues if I encounter > them. > > Peace, > david > -- > David H. Wolfskill [email protected] > Depriving a girl or boy of an opportunity for education is evil. > > See http://www.catwhisker.org/~david/publickey.gpg for my public key. > With respect to messages from FreeBSD mailing lists , my understanding about GPL issue is as follows : The GPL v3 has severe restrictions about use of its licensed software , especially Libraries . Some commercial companies supporting FreeBSD are using FreeBSD in their proprietary products . The GPL v3 is forcing them to legally in a difficult position . Their rescue from this legal threat is to remove GPL parts from the FreeBSD . The reason of switching to a permissive licensed compiler such as clang/LLVM is that . And reason to stay GPL v2 gcc compiler is that . This gcc compiler blocking is NOT permitting to follow new processor developments . Thank you very much . Mehmet Erol Sanliturk _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
