svn commit: r397026 - head/Mk/Uses

[Baptiste Daroussin]

On Tue, Sep 15, 2015 at 09:24:42PM +0000, Dmitry Marakasov wrote:
> Author: amdmi3
> Date: Tue Sep 15 21:24:42 2015
> New Revision: 397026
> URL: https://svnweb.freebsd.org/changeset/ports/397026
> 
> Log:
>   - Use -isystem instead of -I to add ${LOCALBASE}/include to the list of header search paths
>   
>   First, this prevents ports which use strict -Werror settings from
>   build failures in third party headers (real life example is
>   devel/pructl which uses -Werror -Weverything and fails in libedit
>   header on actually harmless padding warning).
>   
>   Second, this prevents ports which install headers from picking up
>   their own headers from LOCALBASE instead of using ones from WRKDIR,
>   which leads to any kind of problems when upgrading via ports.
>   
>   PR:		203101
>   Approved by:	bapt
>   Differential Revision:	D3618

Just to give a bit more information.
Both clang and gcc will lookup for includes (cross building case taken appart)
in that order:

1. -Isomthing
2. -isystem something
3. /usr/include (plus internal path)

Meaning some ports were messed up by the fact we used to add -I${LOCALBASE} in
*FLAGS and their build system also providing -I. by having a lookup path that
looks like the following:

1. -I${LOCALBASE}/include (first in the CFLAG)
2. -I.
3. -isystem
4. internal

Meaning if a header is both in the localbase (older version already installed)
and in sources (newer version) the older version will be used which can result
in a lot of different breakage (either silent wrong macros definitions) or
noisy: building errors and other kind of crap.

Best regards,
Bapt
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