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Trouble #including C headers into C++ code

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Applicable Environment

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Topic: Trouble #including C headers into C++ code
SDP: 6.3.2
Target: Any supported target

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Solution

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If you are trying to #include C header files into C++ code, and using code such as the following:

extern "C" {
#include "libavcodec/avcodec.h>"
#include "libavformat/avformat.h"
}

You may see errors such as:

C:/QNX632/target/qnx6/usr/include/math.h:139: error: template with C linkage

This is occurring because the QNX standard headers frequently have extern "C" ifdef'd in if being compiled as C++. The extern "C" cannot be nested.

The solution is to #include the standard C header that is giving the error, e.g. math.h, before the extern "C".

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NOTE: This entry has been validated against the SDP version listed above. Use caution when considering this advice for any other SDP version. For supported releases, please reach out to QNX Technical Support if you have any questions/concerns.

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