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extern const (Was: Re: [gcc-in-cxx]: patches from multi-target-4_4-branch)

Quoting Ian Lance Taylor <iant@google.com>:
Joern Rennecke <amylaar@spamcop.net> writes: 
	* config/sh/sh.c (sh_attribute_table): Use extern in forward
	declaration.
Common issue with declaring/defining const variables in C++.

I've been doing this as

#ifdef __cplusplus
extern
#endif


These #ifdefs sprinkled over the code are awkward.  Could we use a #define
for this?  E.g. put in system.h
#ifdef __cplusplus
#define CONST_VAR_DECL extern const
#else
#define CONST_VAR_DECL const
#endif

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