Eclipse CDT shows semantic errors, but compilation is ok

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Not sure if this addresses your specific problem, but I also had semantic errors. They just came out of the blue after having a working project.

Anyway, I fixed it with a single option in workspace settings by setting:
“Build configuration for indexer: Use active build configuration”

The other option was “Use the build configuration specified in the project’s indexer settings” and this is the one that wasn’t working. I think it may have been corrupted after an eclipse crash.

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