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__HAVE_BUILTIN_SETJMP__: why?


cpplib unconditionally defines __HAVE_BUILTIN_SETJMP__ to 1.  This was
added back in 1996:

Sat Jan 27 07:59:25 1996  Richard Kenner  (kenner@vlsi1.ultra.nyu.edu)

        * tree.h (enum built_in_function): Add BUILT_IN_{SET,LONG}JMP.
        * expr.c: Include hard-reg-set.h.
        (arg_pointer_save_area): New declaration.
        (expand_builtin, case BUILT_IN_{SET,LONG}JMP): New cases.
        * Makefile.in (expr.o): Includes hard-reg-set.h.
        * c-decl.c (init_decl_processing): Add definitions for
        __builtin_setjmp and __builtin_longjmp.
        * cccp.c (initialize_builtins): Add def of __HAVE_BUILTIN_SETJMP__.

I can find no references to this macro anywhere.  What was it for?

zw


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