https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110920
Bug ID: 110920
Summary: variably-length array declarations as parameters for C
compatibility
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: muecker at gwdg dot de
Target Milestone: ---
g++ rejects variably length arrays in parameters because C++ does not have
this. This is a problem when including some C headers.
extern "C" {
extern void foo(int A, double matrix[A]);
extern void bar(int A, int B, double[A][B]);
}
g++ could simply parse and then ignore the parameter as a language extension.
The first function 'foo' would then be directly usable form C++. For the second
function, there is no corresponding C++ type, but accepting this declaration in
headers would still allow the use of other functions. One could also consider
the possibility to allow calling this function from C++ code with a double*.
