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

[Rogovin, Kevin]

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?

-Kevin