On 18 Aug 2010, at 15:49, Ludovic Courtès wrote:
Hey guile users,
Trying to compile the simple example bessel.c from
Writing-Guile-Extensions.html (renamed bessel.cc because I'm using
g+
+), I
encountered the following error:
bessel.cc: In function 'void init_bessel()':
bessel.cc:13: error: invalid conversion from 'scm_unused_struct*
(*)(scm_unused_struct*)' to 'scm_unused_struct* (*)(...)'
bessel.cc:13: error: initializing argument 5 of
'scm_unused_struct*
scm_c_define_gsubr(const char*, int, int, int, scm_unused_struct*
(*)
(...))'
The SCM type is a pointer to an undefined C type - C hack, which
clashes with C++. Clever in C, but bad for C++ users.
I don’t think that this is the cause of the problem.
The problem instead stems from use of function declarators with empty
parenthesis, which is also an obsolescent C feature, as discussed
here:
http://savannah.gnu.org/bugs/?23681
I fixed a few of these in Guile 1.9, but not all of them, and not
‘scm_c_define_gsubr’ in particular.
I would appreciate patches in this area. :-)
I got those when doing a templates in a C++ wrap, and just assumed it
had something to do with that SCM was a pointer.
