[Patch] Proposal: USE_GNU89 switch

[Mel Flynn]

On Saturday 30 May 2009 16:21:52 Ed Schouten wrote:

> Really, I really don't care how it's done, whether it's a flag or added
> to the compiler flags directly. I'm just saying adding it to CFLAGS
> directly sounds like a very bad idea. Adding it to /etc/make.conf sounds
> even worse, because it probably only confuses (autoconf) scripts that
> try to figure out a way to make the compiler speak C99.

Are there any edge cases of (antiquated) ports that (indirectly) use 
bsd.sys.mk and as such get hit by:
    11  # the default is gnu99 for now
    12  CSTD            ?= gnu99

In other words should one clean CFLAGS of -std before applying the forced one, 
similar as to what WITH_DEBUG in ports does for -O*.
-- 
Mel