invoke.texi (RS/6000 and PowerPC Options): Rewrite -mrelocatable and -mrelocatable...

	* doc/invoke.texi (RS/6000 and PowerPC Options): Rewrite -mrelocatable
	and -mrelocatable-lib description.

From-SVN: r162929

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f6b5099cbe48e902f1a2a03ef18b43b592aa0aca..664079203b951c734c9b2f80ab5d5aa16f8aff70 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2010-08-06  Alan Modra  <amodra@gmail.com>
+
+       * doc/invoke.texi (RS/6000 and PowerPC Options): Rewrite -mrelocatable
+       and -mrelocatable-lib description.
+
 2010-08-05  Bernd Schmidt  <bernds@codesourcery.com>
 
        From Martin Thuresson  <martint@google.com>

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index fb33b728e93d8ab11ab133b36f0b637a6f90495e..08d5f5f61323145f6b28a75a4e3a16c6686db8ae 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -15418,20 +15418,25 @@ unaligned memory references will be handled by the system.
 @itemx -mno-relocatable
 @opindex mrelocatable
 @opindex mno-relocatable
-On embedded PowerPC systems generate code that allows (does not allow)
-the program to be relocated to a different address at runtime.  If you
-use @option{-mrelocatable} on any module, all objects linked together must
-be compiled with @option{-mrelocatable} or @option{-mrelocatable-lib}.
+Generate code that allows (does not allow) a static executable to be
+relocated to a different address at runtime.  A simple embedded
+PowerPC system loader should relocate the entire contents of
+@code{.got2} and 4-byte locations listed in the @code{.fixup} section,
+a table of 32-bit addresses generated by this option.  For this to
+work, all objects linked together must be compiled with
+@option{-mrelocatable} or @option{-mrelocatable-lib}.
+@option{-mrelocatable} code aligns the stack to an 8 byte boundary.
 
 @item -mrelocatable-lib
 @itemx -mno-relocatable-lib
 @opindex mrelocatable-lib
 @opindex mno-relocatable-lib
-On embedded PowerPC systems generate code that allows (does not allow)
-the program to be relocated to a different address at runtime.  Modules
-compiled with @option{-mrelocatable-lib} can be linked with either modules
-compiled without @option{-mrelocatable} and @option{-mrelocatable-lib} or
-with modules compiled with the @option{-mrelocatable} options.
+Like @option{-mrelocatable}, @option{-mrelocatable-lib} generates a
+@code{.fixup} section to allow static executables to be relocated at
+runtime, but @option{-mrelocatable-lib} does not use the smaller stack
+alignment of @option{-mrelocatable}.  Objects compiled with
+@option{-mrelocatable-lib} may be linked with objects compiled with
+any combination of the @option{-mrelocatable} options.
 
 @item -mno-toc
 @itemx -mtoc