additional compiler hardening flags

[Darren Tucker]

On Thu, Apr 18, 2013 at 11:29:55AM +0200, Corinna Vinschen wrote:
> Sounds good to me, but wouldn't it be simpler to add -Werror by default
> in OSSH_CHECK_CFLAG_COMPILE and OSSH_CHECK_CFLAG_LINK?

I considered that, but I was concerned it may mis-detect some of the other
options for compilers that aren't gcc, but identify themselves as such
enough that configure thinks they are and sets $GCC (eg clang, intelcc).
I guess we could check for -Werror too before using it.

-- 
Darren Tucker (dtucker at zip.com.au)
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