[ET Trac] [Einstein Toolkit] #535: Add autoconf macro to test C99 style variable declarations

#535: Add autoconf macro to test C99 style variable declarations -------------------------+-------------------------------------------------- Reporter: eschnett | Owner: Type: enhancement | Status: new Priority: major | Milestone: Component: Cactus | Version: Keywords: | -------------------------+-------------------------------------------------- Many compilers don't support C99 style variable declarations in their default settings. We should test this, add certain flags automatically if we can, or abort with a clear error message otherwise.