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.
--
Richard Guenther