Re: Problems Configuring (C Compiler cannot produce executables)

[Ralf Corsepius]

On 08/23/2012 09:14 AM, Miles Bader wrote:
> Russ Allbery <address@hidden> writes:
> > Also, you should generally not add -Wall -Wextra to the configure flags,
> > and instead add it after configure completes, since many of the tricks
> > configure has to use will result in warnings when you turn on all the
> > compiler warnings, which can confuse configure.
>
> How can that confuse configure?

No idea. The working priciples of standard autoconf checks are based on 
evaluating compiler errors only and to ignore warnings[1], therefore 
-Wall -Wextra must not desturb "by definition".

However, adding -Werror to CFLAGS is dangerous, because this will raise 
GCC warnings to errors, which will cause autoconf to become confused and 
to produce bogus results.

Ralf

[1] There exist (non-standard) autoconf checks which are based on 
evaluating compiler warnings. If properly written, these also should not 
be affected by "-Wall -Wextra", ... if they are, these checks need to be 
considered broken ;)