RFC: soft-fp: Condition sfp-machine.h include path on __KERNEL__

[Joseph Myers <joseph at codesourcery dot com>]

My Linux kernel patch to update the kernel to current glibc soft-fp
<https://sourceware.org/ml/libc-alpha/2015-02/msg00107.html> still
leaves a few small differences between the two copies of soft-fp.

I think it's desirable to avoid such differences completely if
possible by having one set of sources suitable for use in both places.
To that end, this patch introduces a conditional on __KERNEL__ for the
path by which sfp-machine.h is included.

What do people think about the principle of including such
conditionals?  I think one will also be needed for zero-initialization
in _FP_DECL and _FP_FRAC_DECL_* (where Linux kernel functions may do
various operations with different sorts of unpacking and packing, so
it's not obvious to the compiler that the packing always only uses the
fields that were initialized, but the glibc and libgcc use of separate
functions for each operation avoids this issue).  For other
differences I hope to be able to avoid such conditionals.

Tested for powerpc-nofpu that installed stripped shared libraries are
unchanged by this patch.

2015-03-06  Joseph Myers  <joseph@codesourcery.com>

	* soft-fp/soft-fp.h [!_LIBC && __KERNEL__]: Include
	<asm/sfp-machine.h> instead of <sfp-machine.h>.

diff --git a/soft-fp/soft-fp.h b/soft-fp/soft-fp.h
index d0171e3..156048b 100644
--- a/soft-fp/soft-fp.h
+++ b/soft-fp/soft-fp.h
@@ -34,6 +34,8 @@
 
 #ifdef _LIBC
 # include <sfp-machine.h>
+#elif defined __KERNEL__
+# include <asm/sfp-machine.h>
 #else
 # include "sfp-machine.h"
 #endif


-- 
Joseph S. Myers
joseph@codesourcery.com