[Bug c/30719] gcc should probably warn if users compile without -O

["tvb at gnome dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from tvb at gnome dot org  2007-02-07 16:48 -------
(In reply to comment #5)
> To me a warning should not be emitted while using -Wall -O0 as it will break
> all the programs which use -Werror which is a lot of them.  Also this is
> already documented, if people don't read documentation, why would they read
> warnings?

If they are using -Werror and insist on using -O0, then they can go
ahead and specify what warnings they want to ignore, they asked
for it by specifying -Werror.

If documentation were enough, I'm sure there wouldnt be
a warning for -Wuninitialized -O0, but there is, for obvious
reasons - people generally use a build system which typically
uses -Wall by default and generally people dont interface with gcc
directly.

 - Most of the time people need to be warned
 - People compiling with -Werror have a closer relationship
   to the compiler and are better situated to deal with
   the warning that should be appearing for -Wall -O0.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30719