I did a bit of reading and may have found the reason for the compiler error.
I am using g++ 4.1.2. In c++ string literals are defined as const char* and c defines them as char *. The c++ standard allows implicit casts from const char* to char* for backward compatibility reasons with ANSI c. The BIO_set_nbio_accept macro defines a string literal "a" as the fourth argument to BIO_ctrl. The function definition for BIO_ctrl defines the fourth input argument to be void*. Thus the string literal when compiling via g++ is implicitly converted from const char* to const void*, but implicit const conversions to non const conversions (besides the const char* case) is forbidden. Hence the compiler error outlined below. An explicit cast is needed. I tried this theory out by creating my own version of the macro explicitly casting the string literal to a void* and it worked fine. Is there a better way of fixing this problem? Has anyone used the macro with a c++ compiler and run into similar problems? Cheers, -Domingo On 6/18/09, Domingo Kiser <domingo.ki...@gmail.com> wrote: > Does anyone have an answer to the following post from 2003? > > http://marc.info/?l=openssl-dev&m=104635293932621&w=2 > > > List: openssl-dev > Subject: BIO_set_nbio_accept > From: "p b" <phbgt () wanadoo ! fr> > Date: 2003-02-27 13:34:53 > [Download message RAW] > > > I use openssl openssl-0.9.7-stable-SNAP-20030226.tar.gz , with linux > Mandrake 9.0 > > When I compile the BIO_set_nbio_accept(BIO*,int) > > I get the message : > Error : Invalid conversion from 'const void*' to 'void *' > > > If I use the function : > BIO_ctrl(bio,BIO_C_SET_ACCEPT,1,0) , there's no problem, > > If I use the function : > BIO_ctrl(bio,BIO_C_SET_ACCEPT,1,"a") , I get the same error, > > > I think there a problem in the macro > BIO_set_nbio_accept(b,n) BIO_ctrl(b,BIO_C_SET_ACCPET,1,(n)?"a":NULL) > > > Thanks > > > > > > > I just ran into the same problem. > > --Domingo > -- Sent from my mobile device ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
