Andrew Pantyukhin wrote:
> 7zip developers converted some code from C++ to C,
> while leaving the main stand-alone lzma app in C++.
> They use 'extern "C" { }' blocks around #include's
> referencing C headers.
>
> Everything compiles fine, but "undefined reference"
> errors appear at linkage. The undefined references
> are to the C functions included from withing those
> 'extern "C"' wrappers. I tried to remove the
> wrappers from some files and the amount of errors
> decreased a bit. Is there a better workaround?
>
> Google came up with two results: remove the wrappers
> or use c++ instead of cc. I'm already using c++.


Many of the C headers are available in a different form for C++
programs. For example, in a C++ program you can #include
instead of .

You can use nm(1) on the .o files to see where the problem comes from.

Diomidis
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