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http://www.openoffice.org/issues/show_bug.cgi?id=112242
                 Issue #|112242
                 Summary|[solenv] setsolar environment on unxlngi6 incomplete: 
                        |use --sysroot
               Component|tools
                 Version|DEV300m80
                Platform|All
                     URL|
              OS/Version|Linux
                  Status|NEW
       Status whiteboard|
                Keywords|
              Resolution|
              Issue type|DEFECT
                Priority|P3
            Subcomponent|solenv
             Assigned to|hjs
             Reported by|mst





------- Additional comments from [email protected] Wed Jun  9 10:23:59 +0000 
2010 -------
currently the setsolar environment on unxlngi6 uses GCC's -isystem flag to get
it to use
the baseline headers instead of the ones in /usr.

>        -isystem dir
>            Search dir for header files, after all directories specified by -I
>            but before the standard system directories.  Mark it as a system
>            directory, so that it gets the same special treatment as is applied
>            to the standard system directories.

GCC also has another flag with a similar purpose:

>        --sysroot=dir
>            Use dir as the logical root directory for headers and libraries.
>            For example, if the compiler would normally search for headers in
>            /usr/include and libraries in /usr/lib, it will instead search
>            dir/usr/include and dir/usr/lib.
> 
>            If you use both this option and the -isysroot option, then the
>            --sysroot option will apply to libraries, but the -isysroot option
>            will apply to header files.
> 
>            The GNU linker (beginning with version 2.16) has the necessary sup‐
>            port for this option.  If your linker does not support this option,
>            the header file aspect of --sysroot will still work, but the
>            library aspect will not.

the difference seems to be that:
1. -isystem only works for headers, not libraries, but --sysroot does both
2. -isystem merely inserts the given directory before system directories,
    but --sysroot actually removes the system directories from the search path

so with --sysroot an incomplete baseline should lead to a broken build (as it
should be);
the build will not erroneously succeed by building against whatever happens to
be installed in /usr,
as it does currently.

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