Install correct bits/long-double.h for MIPS64 (bug 22322) [committed]

[Joseph Myers <joseph at codesourcery dot com>]

Similar to bug 21987 for SPARC, MIPS64 wrongly installs the ldbl-128
version of bits/long-double.h, meaning incorrect results when using
headers installed from a 64-bit installation for a 32-bit build.  (I
haven't actually seen this cause build failures before its interaction
with bits/floatn.h did so - installed headers wrongly expecting
_Float128 to be available in a 32-bit configuration.)

This patch fixes the bug by moving the MIPS header to
sysdeps/mips/ieee754, which comes before sysdeps/ieee754/ldbl-128 in
the sysdeps directory ordering.  (bits/floatn.h will need a similar
fix - duplicating the ldbl-128 version for MIPS will suffice - for
headers from a 32-bit installation to be correct for 64-bit builds.)

Tested with build-many-glibcs.py (compilers build for
mips64-linux-gnu, where there was previously a libstdc++ build failure
as at
<https://sourceware.org/ml/libc-testresults/2017-q4/msg00130.html>).

Committed to master.  Will cherry-pick to 2.26 and 2.25 in a few days' 
time.

2017-10-19  Joseph Myers  <joseph@codesourcery.com>

	[BZ #22322]
	* sysdeps/mips/bits/long-double.h: Move to ....
	* sysdeps/mips/ieee754/bits/long-double.h: ... here.

diff --git a/sysdeps/mips/bits/long-double.h b/sysdeps/mips/bits/long-double.h
deleted file mode 100644
index 604188e..0000000
--- a/sysdeps/mips/bits/long-double.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Properties of long double type.  MIPS version.
-   Copyright (C) 2016-2017 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License  published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sgidefs.h>
-
-#if !defined __NO_LONG_DOUBLE_MATH && _MIPS_SIM == _ABIO32
-# define __NO_LONG_DOUBLE_MATH	1
-#endif
diff --git a/sysdeps/mips/ieee754/bits/long-double.h b/sysdeps/mips/ieee754/bits/long-double.h
new file mode 100644
index 0000000..604188e
--- /dev/null
+++ b/sysdeps/mips/ieee754/bits/long-double.h
@@ -0,0 +1,23 @@
+/* Properties of long double type.  MIPS version.
+   Copyright (C) 2016-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sgidefs.h>
+
+#if !defined __NO_LONG_DOUBLE_MATH && _MIPS_SIM == _ABIO32
+# define __NO_LONG_DOUBLE_MATH	1
+#endif

-- 
Joseph S. Myers
joseph@codesourcery.com