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[BUILD] CPPFLAGS, CFLAGS and LDFLAGS fixes
* Set internal CPPFLAGS as EXTRA_CPPFLAGS, CFLAGS as EXTRA_CFLAGS,
and LDFLAGS as EXTRA_LDFLAGS
- Don't overwrite CPPFLAGS, LDLFAGS or CFLAGS from the environment
- They are irrelevant for BUILD_CC
- When cross-compiling for a ppc64 host on a non-ppc64 host,
EXTRA_CFLAGS, which is included in BUILD_CPPFLAGS contains
-mcall-aixdesc, which does not work on i386 at least
* Use LDFLAGS when linking kexec
- Append rather than overwrite in purgatory/Makefile
The purpose of these changes is three-fold.
* CPPFLAGS, CFLAGS and LDFLAGS from the environment really ought
to be honoured. For one thing;
* Without these changes, the confgiure taget in
the toplevel makefile can't work
* Without these changes, cross compiling does not work -
well, I can't work out how to get it to work anyway.
Signed-Off-By: Simon Horman <horms@verge.net.au>
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