[GSoC] Header Generation for C/C++

[Nicholas Wilson]

On Wednesday, 17 July 2019 at 11:05:21 UTC, Eduard Staniloiu 
wrote:
> On Tuesday, 16 July 2019 at 13:46:56 UTC, rikki cattermole 
> wrote:
>> So currently there is no way to restrict it to just extern(C)?
>> I ask this because -HC makes me think C not C++ headers.
>
> Currently the outputted headers are C++ headers, but we were 
> thinking of wrapping `extern (C++)` definitions inside an 
> `#ifdef __cplusplus` block, and prefixing any `extern (C)` 
> definitions with the following `EXTERNC` macro
>
> ```
> #ifdef __cplusplus
> #define EXTERNC extern(C)
> #else
> #define EXTERNC
> #endif
> ```
>
> This way, the generated header could be used in both C and C++.
>
> What do you think?

It should be pretty trivial to just check the linkage of the 
symbols and only output extern(C) symbols.

Also you've clearly been doing too much D programming! (which is 
probably a good thing) That would be:
#define EXTERNC extern "C" {

and you need to macro the closing brace as well.