Re: [ANN] Lua 5.3.0 (rc3) now available
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- Subject: Re: [ANN] Lua 5.3.0 (rc3) now available
- From: Daurnimator <quae@...>
- Date: Fri, 2 Jan 2015 11:37:34 -0500
On 2 January 2015 at 08:36, Luiz Henrique de Figueiredo
<lhf@tecgraf.puc-rio.br> wrote:
> We expect the compilation will go smoothly as usual
> but please report any warnings or other glitches.
Compiling with gcc's --pedantic gives a single warning:
loadlib.c: In function ‘lsys_sym’:
loadlib.c:151:21: warning: ISO C forbids conversion of object pointer
to function pointer type [-Wpedantic]
lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
^
To get around this, you need to use this hack: (as seem in dlsym manpage/POSIX):
double (*cosine)(double);
/* Writing: cosine = (double (*)(double)) dlsym(handle, "cos");
would seem more natural, but the C99 standard leaves
casting from "void *" to a function pointer undefined.
The assignment used below is the POSIX.1-2003 (Technical
Corrigendum 1) workaround; see the Rationale for the
POSIX specification of dlsym(). */
*(void **) (&cosine) = dlsym(handle, "cos");