[Mesa-dev] extern "C" sometimes in header files but not always..

[Emil Velikov]

On 31/03/14 11:55, Rogovin, Kevin wrote:
> Hi,
> 
>  I was doing some experiments and had linking issues with C++ code and saw that some Mesa header files have extern "C" wrappers and others do not. For example running:
> 
> $ find src/mesa/main -type f -name "*.h" -exec  grep  -H -E -o -c "extern \"C\"" {} \; | grep  :0 | wc -l
> 
> gives a result of 109 files. However, some header files in mesa/main and other places do have the extern "C" { wrapper, such as mesa/main/mtypes.h.
> 
> What is the rule, if any, of what files have the extern "C" protection so that the file is suitable for inclusion by C++ source files?
> 
I'm not entirely sure if there is a rule to be honest. I would suspect that
people update the headers as needed, based on the fact that originally mesa
did not have any/was not linked against c++ code.

IMHO if would be great if we have those guards at least in the headers we
distribute during install, although I've not checked if that is the case.

-Emil

P.S. Take the above statements with a pinch of salt.

> -Kevin
> 
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