Patch: PR libgcj/28426: Fix install directory for libgcj headers in cross build.

[David Daney]

 From the PR:

libgcj headers are installed in: GCC_PREFIX/include/c++/4.2.0

For a cross build g++ looks in GCC_PREFIX/${target}/include/c++/4.2.0

The result is that (by default) cni include files like gcj/cni.h cannot be
found by g++.

For a native build there is no problem.

The patch copies the logic from libstdc++-v3 into 
config/gxx-include-dir.m4 and adds a comment to 
libstdc++-v3/acinclude.m4 that points to the code that should be kept in 
sync.

Grepping the sources it appears that the change to 
config/gxx-include-dir.m4 only effects libjava/configure.  So although 
the fix is done in the config directory only libjava will be effected.

FWIW: I think this is a regression from 3.3.1, but I am not positive 
because my 3.3.1 build is quite hacked up.


Testing on i686-pc-linux -> mipsel-linux cross (no-regressions) and 
i686-pc-linux-gnu native (in progress), although the testsuite does not 
really expose this type of install problem.

OK to commit?

libstdc++-v3:
2006-07-18  David Daney  <ddaney@avtrex.com>

	PR libgcj/28426
	* acinclude.m4: Added a comment.

config:
2006-07-18  David Daney  <ddaney@avtrex.com>

	PR libgcj/28426
	* gxx-include-dir.m4: Use target_alias in path for cross build.

libjava:
2006-07-18  David Daney  <ddaney@avtrex.com>

	PR libgcj/28426
	* configure: Regenerated.
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