Re: determine base type of a typedef

[Bob Friesenhahn]

On Fri, 23 Oct 2020, Vivien Kraus wrote:
> Is it not possible to always use "%lld" and always convert the
> arguments to (long long int)?

The way I have been doing things for many years is to get the size of 
the underlying type and then include a cast in the printf arguments to 
a type of the same size.  The need to add a cast is a bit messy, but 
then then again, just about everything related to printf is messy.

So create a define for the time_t formatter, and a define/typedef for 
the type to cast to.

The approach that Paul Eggert suggests is very interesting, but it 
might not provide absolute proof of the C type since the 
compiler/linker might allow success if the types are the same size.  A 
printf syntax checker might not use the same rules.

Anything involving executing code should be avoided as much as 
possible since it hurts cross compilation.

Anything involving recent C standards should be avoided since it harms 
portability.

Bob
--
Bob Friesenhahn
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