[PATCH] Config documentation for eglibc and SPE

Nate Case ncase@xes-inc.com
Wed Aug 27 13:46:00 GMT 2008

This is some documentation I had in my own eglibc and SPE support that I
did before Thomas JOURDAN's patches were merged.  I adjusted it slightly
to correspond correctly to the current code.

Nate Case <ncase@xes-inc.com>

Index: config/libc.in
--- config/libc.in	(revision 967)
+++ config/libc.in	(working copy)
@@ -23,6 +23,13 @@
     depends on EXPERIMENTAL
+    help
+      EGLIBC (Embedded GLIBC) is a variant of the standard GNU GLIBC
+      that is designed to work well on embedded systems.  EGLIBC strives
+      to be source and binary compatible with GLIBC.  Its goals include
+      a reduced footprint, configurable components, and improved
+      cross-compilation support.  EGLIBC also includes some embedded ports
+      (such as e500/spe) that are normally separate add-ons of GLIBC.
 source config/libc/eglibc.in
Index: arch/powerpc/config.in
--- arch/powerpc/config.in	(revision 967)
+++ arch/powerpc/config.in	(working copy)
@@ -14,4 +14,13 @@
     depends on EXPERIMENTAL
     default n
-      Add support for the Signal Processing Engine.
+      Add support for the Signal Processing Engine.  This will set up
+      the toolchain so that it supports the SPE ABI extensions. This
+      mainly targets Freescale e500 processors.
+      Setting this option will append "spe" to the end of your target
+      tuple name (e.g., powerpc-e500v2-linux-gnuspe) so that the gcc
+      configure/build system will know to include SPE ABI support.
+      It will also automatically add "-mabi=spe -mspe" to your
+      TARGET_CFLAGS, and "--enable-e500_double" to your CC_EXTRA_CONFIG,
+      so you do not need to explicitly add them.

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