[Bug-gsl] Missing extern "C" because of symbol redefinition. GSL 1.9, g++ (GCC) 4.1.2 20071124 (Red Hat 4.1.2-42)

[Joshua Shaffer]

"sys/infnan.c", "sys/hypot.c" and "sys/coerce.c" include forward function
symbol declarations that redefine the symbols in the header files. The new
definitions drop the extern "C".

When compiling with a c++ compiler, the function turns out to have a mangled
c++ symbol name yet they are referenced as if they were C symbols.

===============================================================================================================================
diff -rb gsl-1.9/rng/file.c gsl-1.9-patched/rng/file.c
30c30
<   char * state = r->state;
---
>   char * state = (char*)(r->state);
47c47
<   char * state = r->state;
---
>   char * state = (char*)(r->state);
diff -rb gsl-1.9/sys/coerce.c gsl-1.9-patched/sys/coerce.c
22a23,35
> #undef __BEGIN_DECLS
> #undef __END_DECLS
> #ifdef __cplusplus
> # define __BEGIN_DECLS extern "C" {
> # define __END_DECLS }
> #else
> # define __BEGIN_DECLS /* empty */
> # define __END_DECLS /* empty */
> #endif
>
> __BEGIN_DECLS
>
>
54a68
> __END_DECLS
diff -rb gsl-1.9/sys/fdiv.c gsl-1.9-patched/sys/fdiv.c
22a23,34
> #undef __BEGIN_DECLS
> #undef __END_DECLS
> #ifdef __cplusplus
> # define __BEGIN_DECLS extern "C" {
> # define __END_DECLS }
> #else
> # define __BEGIN_DECLS /* empty */
> # define __END_DECLS /* empty */
> #endif
>
> __BEGIN_DECLS
>
29a42,43
>
> __END_DECLS
diff -rb gsl-1.9/sys/hypot.c gsl-1.9-patched/sys/hypot.c
22a23,35
> #undef __BEGIN_DECLS
> #undef __END_DECLS
> #ifdef __cplusplus
> # define __BEGIN_DECLS extern "C" {
> # define __END_DECLS }
> #else
> # define __BEGIN_DECLS /* empty */
> # define __END_DECLS /* empty */
> #endif
>
> __BEGIN_DECLS
>
>
48a62
> __END_DECLS
diff -rb gsl-1.9/sys/infnan.c gsl-1.9-patched/sys/infnan.c
26a27,39
> #undef __BEGIN_DECLS
> #undef __END_DECLS
> #ifdef __cplusplus
> # define __BEGIN_DECLS extern "C" {
> # define __END_DECLS }
> #else
> # define __BEGIN_DECLS /* empty */
> # define __END_DECLS /* empty */
> #endif
>
> __BEGIN_DECLS
>
>
147a161
> __END_DECLS
===============================================================================================================================


Thanks,

-- 
Joshua Shaffer