definition of R_problem_buf in S.h (PR#210)

[Martin Maechler]

>>>>> On Mon, 14 Jun 1999 17:56:06 +0200 (MET DST), vogels@ieee.org said:

    vogels> Full_Name: Thomas Vogels Version: 0.64.1 OS: AIX 4.2 Submission
    vogels> from: (NULL) (198.133.22.70)


    vogels> R_problem_buf is defined, not just declared, in S.h:

    vogels> #define R_PROBLEM_BUFSIZE 4096 char
    vogels> R_problem_buf[R_PROBLEM_BUFSIZE];

    vogels> This is bad since every time S.h is included this buffer is
    vogels> defined.  The linker will eventually complain about multiple
    vogels> definitions of this symbol.
no.
All our include files ``idempotent'' : Including them multiple times
doesn't change anything.
This protection is *very* standard and is achieved by (for the case of S.h) 

#ifndef R_S_H
#define R_S_H
.................. everything ......
#endif

    vogels> Solution: declare R_problem_buf to be extern in S.h, then
    vogels> allocate memory for it in a source file, like main.c with: char
    vogels> R_problem_buf[R_PROBLEM_BUFSIZE];

Not the real solution, main.c does not even include S.h !

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