Re: Help with strict-aliasing warning

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Kevin Kofler wrote:
Orion Poplawski wrote:
I'm getting:

/builddir/build/BUILD/gdl-0.9.8/src/basic_pro_jmg.cpp: In function 'void
lib::linkimage(EnvT*)':
/builddir/build/BUILD/gdl-0.9.8/src/basic_pro_jmg.cpp:159:36: warning:
dereferencing type-punned pointer will break strict-aliasing rules
[-Wstrict-aliasing]
         (BaseGDL* &) dynFun[count_fun] =
                      ~~~~~~~~~~~~~~~~^
                    (BaseGDL*) dlsym(module[count], entryName.c_str());


dynFun is defined as:

    BaseGDL*(*dynFun[MAXNDLL/2])( EnvT* e);

This is all beyond me.  Missing the function pointer argument
specification?

Try:

dynFun[count_fun] =
   (BaseGDL*(*)(EnvT*)) dlsym(module[count], entryName.c_str());

Yes.  Introducing a typedef might aid understanding:

    typedef BaseGDL* (*dynFun_t)(EnvT* e);
    dynFun_t dynFun[MAXDLL/2];
//   ...
    dynFun[count_fun] = (dynFun_t) dlsym(...);
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