[v3 PATCH] Fix Darwin bootstrap failure: EBADMSG in system_error

[Roger Sayle]

The following patch fixes the current libstdc++ bootstrap failure on 
powerpc-apple-darwin7.9.0.  The issue is that the new system_error header 
file unconditionally uses the value EBADMSG (everyone knows monosodium 
glutamate isn't good).  Alas not all almost POSIX systems provide this value 
in sys/errno.h.

The fix is similar to Ben Kosnik's previous fix for FreeBSD, to add a 
suitable configure check, and then guard the usafe of EBADMSG and 
std::bad_message by _GLIBCXX_HAVE_EBADMSG.

The following patch has been tested on powerpc-apple-darwin7.9.0 where it 
allows the a full "make bootstrap" to complete without problems.  A 
top-level "make -k check" also reveals that the testcase fixes are 
sufficient to prevent them failing (as with Ben's FreeBSD patch).

Ok for mainline?

2007-09-05  Roger Sayle  <roger@eyesopen.com>

        * acinclude.m4 (GLIBCXX_CHECK_SYSTEM_ERROR): Add EBADMSG for darwin.
        * configure: Regenerate.
        * include/std/system_error: Guard.
        * testsuite/19_diagnostics/headers/system_error/
        types_std_c++0x.cc: Same.
        * testsuite/19_diagnostics/error_category/cons/copy_neg.cc: Adjust
        line numbers.

Roger
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