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Asked: May 10, 20262026-05-10T20:50:35+00:00 2026-05-10T20:50:35+00:00

All of our C++ headers use a .h extension. Eclipse thinks these are C

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All of our C++ headers use a .h extension. Eclipse thinks these are C headers and flags them with lots of syntax errors on things like classes and namespaces.

I’ve tried to change the file type association from:

Preferences > C/C++ > File types 

but it’s ‘locked’.

Interestingly, ‘*.h’ is associated with both C and C++ headers, but it seems to be using C. How can I get Eclipse to treat .h files as C++?

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  1. 2026-05-10T20:50:35+00:00Added an answer on May 10, 2026 at 8:50 pm

    Try creating a new project and specify your source area as the location. However, be sure you select C++ project (I usually use the makefile option). This is all you should have to do in order to make the parser recognize C++ syntax.

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