Debugging an errant -isystem

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1

I have a project that keeps insisting on putting in a -isystem DIRECTORY, where the directory is completely inappropriate (it points to a directory is not relevant that is from another project elsewhere on my machine) and I have no idea why or how to get rid of it.

I searched all the files in my project, and find no hint of this directory. I also searched environment variables.

When I run ‘cmake --build build’ it suddenly shows up. I get a compiler error:

gmake[2]: *** No rule to make target ‘/Volumes/eda/osci/src/lwg/build/cmake-debug/src/libsystemc.2.4.0_pub_rev_20191203.dylib’, needed by ‘reporting’. Stop.

Where does the cmake get its instructions for this?

I’ve read various the “Use of -isystem” but it does not talk about how to remove these.

2

You should be able to use cmake --trace-expand . to get logging of all the code CMake sees with variables expanded. If it’s not there, are you using some toolchain file?

3

No special toolchain.

Thank you. That helped me to track down the issue; although, I also found another helpful switch: --debug-find that provided more focussed information on what find_package was doing.