include paths and gcc-3.0.4

include paths and gcc-3.0.4

[David Caldwell]

Hello all,

First off: gcc version 3.0.4, newlib version 1.10.0.

  I'm having a bunch of problems with include paths. I'm trying to make a 
cross-compiler for arm-elf (for an embedded project). The problem is that 
I'm using newlib, but gcc keeps insisting on making the default include 
path "/usr/include" which is clearly wrong as newlib doesn't even install 
its include stuff there. Newlib's includes get put into 
/usr/local/arm-elf/include. So to get my stuff to compile at the moment I 
have to pass "-I- -I /usr/local/arm-elf/include" to gcc which is really 
gross (not to mention non-portable).

I have tried configuring with the following options (in various 
combinations with various different values) and I have had no luck in 
getting gcc to find the headers.

--prefix=/usr/local
--with-gxx-include-dir=/usr/local/arm-elf/include/g++-v3
--includedir=/usr/local/arm-elf/include
--with-headers=/$(gcc_source)/gcc/gincludes

CROSS_INCLUDE_DIR looks promising but I can't figure out how to cleanly set 
it. It defaults to /usr/local/arm-elf/sys-include which is not where newlib 
goes.

So, three questions:
 * How do I get gcc to search the correct place by default?
 * Can I put the "-I" junk in the specs file?
 * Why doesn't this just work by default?

Thanks,
  David