Mailinglist Archive: opensuse-factory (883 mails)

[Cristian Rodríguez <crrodriguez@xxxxxxxxxxxx>]

El 10/05/12 06:45, Richard Guenther escribió:
> On Thu, 10 May 2012, Stephan Kulow wrote:
>
> > Am 09.05.2012 23:19, schrieb Cristian Rodríguez:
> > > when -ansi is used and (defined(_GNU_SOURCE) || (_XOPEN_SOURCE>= 700 ||
> > > _POSIX_C_SOURCE>= 200809L)) is false, there is no stpcpy prototype and
> > > hence no optimization.
> > >
> > > Thoughts ?
> > My usual question would apply: Can you measure the difference? If not, I
> > wouldn't want to waste my energy discussing this.
> >
> > -ansi is a _very_ popular flag - e.g. all of KDE (3 and 4) uses it.
>
> Using this flag (or what it aliases to - -std=c++98/c90 as opposed to
> the defaults which are gnu++98/gnu90) makes sense to avoid GCC
> features creep into a codebase and thus make sure the source will also
> build using compilers that are not GCC (or implement all of its
> extensions).  Using the flag to produce binaries for a GNU/Linux
> system makes less sense though.
>
> I'm not sure what we should do here, but if we do something we
> need to handle -std=c90, -std=c99, etc. the same way (thus,
> recommend the gnu variants).
>
> Richard.

While ugly, I believe we could use an enviroment variable, 
SUSE_CC_PREFER_GNU where all this flags are equivalent to -std=gnu99

Packages can then unset that variable in the rare case it causes a problem.

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