Re: CEDET calls cpp -E -dM -x c++ /dev/null

[Eli Zaretskii]

> Date: Thu, 2 Jul 2009 20:13:06 +0200
> From: Lennart Borgman <address@hidden>
> Cc: Eli Zaretskii <address@hidden>, address@hidden, address@hidden
> 
> Eric, I looked at your code again and realize that you are using "gcc
> -v" to get info. On w32 it gives "--prefix=/mingw" which lacks the
> drive letter and therefore is useless. I have filed a bug report
> 
>     http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40624

As you already saw in the responses there, the value of --prefix
cannot be helpful when you install precompiled binaries in a different
directory anyway.  It is only helpful if your GCC was built on the
same machine it is used.  So I think it's futile to pursue this line
of fixing the problem.

> However for now a workaround must be used and I suggest on w32 using
> the information from
> 
>          (let* ((gcc-exe (locate-file "gcc" exec-path exec-suffixes
> 'executable))
>                 (gcc-root (expand-file-name ".." (file-name-directory 
> gcc-exe)))
> 
> I believe gcc-root contains the info that --prefix should have given.

Only if none of the *_INCLUDE_PATH variables is set in the
environment.  So I think CEDET needs to inspect those variables first.