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Subject: Re: [Boost-build] Build issues with boost/regex and ICU_PATH
From: Vladimir Prus (ghost_at_[hidden])
Date: 2008-10-26 03:45:05

On Saturday 25 October 2008 07:29:56 Steve M. Robbins wrote:
> On Fri, Oct 24, 2008 at 08:51:25AM -0400, Alexander Sack wrote:
> > On Fri, Oct 24, 2008 at 4:43 AM, John Maddock <john_at_[hidden]> wrote:
> > > No it's deliberate: adding /usr/include to the list of include paths breaks
> > > most *nix systems, well gcc on Linux anyway. So any patch has to be BSD
> > > specific.
> >
> > Wait, /usr/local/include breaks gcc on Linux? I realize /usr/include
> > might but /usr/local/include?
> It breaks any GCC, since:
> (a) gcc has /usr/local/include on its default include search path, and
> (b) specifying -I /usr/local/include means it is on the path twice, so
> (c) #include_next doesn't work properly.

Just to clarify -- what exactly #include_next is supposed to do in any
header installed in /usr/local/include?

> At least, that's my recollection of the problem (which was many years
> ago on IRIX). Take it with a grain of salt, since my memory has
> recently been shown to be faulty. :-)

I *think* modern gcc will flat out refuse to add an include directory that
is already searched by defaul.

- Volodya

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