Re: [RFA 1/2]: Don't ignore target_header_dir when deciding inhibit_libc

[Hans-Peter Nilsson <hans-peter.nilsson@axis.com>]

> From: Ulrich Weigand <uweigand@de.ibm.com>
> Date: Mon, 12 Oct 2015 11:58:40 +0200

(cutting *only* because I had a comment; not an indication of
preference.)

> --or--
> 
> 2b) Change target_header_dir from a single directory to a list of
>     directories, and check all of these for header files.  This list
>     would typically include both sys-include and include.
> 
> This should not change behavior for any existing user, and would
> bring the header search at configure time in line with the actual
> search order used by the compiler at run time, which will probably
> be the least surprise to users anyway ...

Agreed.  Just pointing out that it would take some effort in
gcc/configure.ac.

> For 1), something like the following should probably suffice:
> 
> Index: gcc/configure.ac
> ===================================================================
> --- gcc/configure.ac	(revision 228530)
> +++ gcc/configure.ac	(working copy)
> @@ -1993,7 +1993,7 @@ elif test "x$TARGET_SYSTEM_ROOT" != x; t
>  fi
>  
>  if test x$host != x$target || test "x$TARGET_SYSTEM_ROOT" != x; then
> -  if test "x$with_headers" != x; then
> +  if test "x$with_headers" != x && test "x$with_headers" != xyes; then
>      target_header_dir=$with_headers
>    elif test "x$with_sysroot" = x; then
>      target_header_dir="${test_exec_prefix}/${target_noncanonical}/sys-include"
> 
> 
> I'll probably not spend any more time right now to try to implement
> either of the 2) variants; I can live with using sys-include for now.

To be clear (to those skipping most of the thread), I'm ok with this.

Thanks.

brgds, H-P