Fernando Gomes wrote: > This code that compiles with GCC 3.x now doesn’t compile with GCC 4.x, > is it possible to change some compiler directive in order to make it > work again without have to change all the code? No. > This is just a code > snippet, we have lots of code where void* variables are explicitly > casted to other type pointers like in this small example, and we have > the same error on all of them (in this case is when we try to > increment the value pointed by gpf, we also have errors on similar > situations like assignments and decrements). Sorry, this isn't going to work. You're using a gcc extension known as "generalize lvalues" which IIRC was removed in about 2004. http://gcc.gnu.org/gcc-3.4/changes.html "The cast-as-lvalue extension has been removed for C++ and deprecated for C and Objective-C. In particular, code like this: int i; (char) i = 5; or this: char *p; ((int *) p)++; is no longer accepted for C++ and will not be accepted for C and Objective-C in a future version." Workarounds for this are in most cases pretty obvious. We don't usually break backwards compatibility by deleting well-known gcc extensions, but this one is so evil that it had to go. Andrew. > > void * gfp; > > gpf = & …….. > > *((int *)gfp)++; > > Error message: > > error: lvalue required as increment operand
