Please describe the problem:
I was building GIMP with -fno-common (i.e. "bork on multiply-defined symbols"), and encountered a build error: "ts_output_routine" was being multiply defined.

Now, in script-fu/tinyscheme/scheme.c:387, we have

    void (*ts_output_routine) (const char *, int) = NULL;

which is where this symbol normally lives. Now, in scheme.h:118...

    SCHEME_EXPORT void (*ts_output_routine) (const char *, int);

What is SCHEME_EXPORT? Look in scheme.h:16:

    #ifndef _MSC_VER
    # ifndef USE_STRLWR
    #   define USE_STRLWR 1
    # endif
    # define SCHEME_EXPORT
    #else
    # define USE_STRLWR 0
    # ifdef _SCHEME_SOURCE
    #  define SCHEME_EXPORT __declspec(dllexport)
    # else
    #  define SCHEME_EXPORT __declspec(dllimport)
    # endif
    #endif

Non-Windows systems use an empty SCHEME_EXPORT. See the problem with this?

Forthcoming patch defines SCHEME_EXPORT to "extern".

Steps to reproduce:


Actual results:


Expected results:


Does this happen every time?


Other information: