How can I enable the use of VLAs, variable length arrays as defined in C99, in MS Visual C++ or that is not possible at all?
Yes I know that the C++ standard is based on C89 and that VLAs are not available in C89 standard and thus aren't available in C++, but MSVC++ is supposed to be a C compiler also, a behavior that can be switched on using the /TC compiler parameter (Compile as C Code (/TC)
). But doing so does not seem to enable VLAs and the compiling process fails with the same errors when building as C++ (Compile as C++ Code (/TP)
). Maybe MSVC++ C compiler is C89 compliant only or I am missing something (some special construct or pragma/define)?
Code sample:
#include <stdlib.h>
int main(int argc, char **argv)
{
char pc[argc+5];
/* do something useful with pc */
return EXIT_SUCCESS;
}
Compile errors:
error C2057: expected constant expression
error C2466: cannot allocate an array of constant size 0
error C2133: 'pc' : unknown size
Question&Answers:
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