Re: Dejagnu: use -isystem to include system header files.

[Richard Earnshaw <rearnsha@gcc.gnu.org>]

Nick Clifton wrote:
        I am going to check in the attached patch which imports a fix from
        the mainline dejagnu sources.  This fix is to use the -isystem
        switch to include system header files rather than -I.  This fixes
        several unexpected failures in the GCC and G++ testsuites where the
        newlib system header file <limits.h> is included in strict ANSI
        mode, and the compiler barfs on the #include_next directive.
        
Unfortunately this patch causes regressions on the gcc builtins tests. 
These tests rely on detecting newlib by looking for the definition of
_NEWLIB_VERSION being added by including limits.h; but the change in the
search order means that we now pick up a dummy version of newlib.h from
the gcc include directory.  

With your patch the search path has now become

 /work/rearnsha/gnu/egcs/gcc/include
 /work/rearnsha/gnu/egcs/arm-elf/./newlib/targ-include
 /home/rearnsha/gnusrc/egcs-cross/newlib/libc/include

Whereas previously the gcc/include directory came later in the search.

R.