Prefixes for libgcc symbols (C6X 9.5/11)

[Joseph S. Myers]

On Fri, 13 May 2011, Bernd Schmidt wrote:

> The following patch adds a target hook and a corresponding LIBGCC2_
> macro which control the generation of library function names. It also
> makes libgcc-std.ver a generated file, built from libgcc-std.ver.in by
> replacing some placeholders with the correct prefixes. While I was
> there, I also added functionality to generate a version of this file
> with an extra underscore for the Blackfin port.

But the linker was changed to use C symbol names in linker scripts and I 
was told that this script in GCC would be removed in consequence.

http://sourceware.org/ml/binutils/2010-12/msg00375.html

Any new target macro for use only in target libraries should, in my view, 
be poisoned in the host system.h from the start to ensure that no-one 
accidentally adds definitions to the host tm.h.  This would be alongside 
the existing

/* Target macros only used for code built for the target, that have
   moved to libgcc-tm.h.  */
 #pragma GCC poison DECLARE_LIBRARY_RENAMES

or just change the comment on that pragma so it doesn't imply that the 
macro was once defined in tm.h.

-- 
Joseph S. Myers
joseph@codesourcery.com