GNU C Library master sources branch master updated. glibc-2.20-501-g28c3844

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commit 28c38448de826314c1d89b18a26042fee21d7c9c
Author: Matthew Fortune <matthew.fortune@imgtec.com>
Date:   Tue Jan 6 15:06:14 2015 +0000

    NEWS for MIPS ABIs
    
    	* NEWS: Announce support for new MIPS ABI extensions.

diff --git a/NEWS b/NEWS
index a2f93a1..0e3301e 100644
--- a/NEWS
+++ b/NEWS
@@ -53,6 +53,26 @@ Version 2.21
 
 * Merged gettext 0.19.3 into the intl subdirectory.  This fixes building
   with newer versions of bison.
+
+* Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
+  The original MIPS o32 hard-float ABI requires an FPU where double-precision
+  registers overlay two consecutive single-precision registers.  MIPS32R2
+  introduced a new FPU mode (FR=1) where double-precision registers extend the
+  corresponding single-precision registers which is incompatible with the
+  o32 hard-float ABI.  The MIPS SIMD ASE and the MIPSR6 architecture both
+  require the use of FR=1 making a transition necessary.  New o32 ABI
+  extensions enable users to migrate over time from the original o32 ABI
+  through to the updated o32 FP64 ABI.  To achieve this the dynamic linker now
+  tracks the ABI of any loaded object and verifies that new objects are
+  compatible.  Mode transitions will also be requested as required and
+  unsupportable objects will be rejected.  The ABI checks include both soft and
+  hard float ABIs for o32, n32 and n64.
+
+  GCC 5 with GNU binutils 2.25 onwards:
+  It is strongly recommended that all o32 system libraries are built using the
+  new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
+  with the original and all new o32 ABI extensions.  Configure a MIPS GCC
+  compiler using --with-fp-32=xx to set this by default.
 
 Version 2.20
 

-----------------------------------------------------------------------

Summary of changes:
 NEWS |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)


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