@bugaevc Emacs should do that out of the box (tested with emacs -Q and it detected a C++ header file correctly). Does the detection fail every time? Are your .h files distinguishable from C headers?
Indeed, it seems to work out of the box (with -Q) for C++ headers. This means something in Spacemacs, which I'm using, breaks it. But even then, it doesn't seem to work with Objective-C headers?
I don't want to either do project-specific configuration or set up .h to always mean c++-mode — I want it to always do the right thing, automatically.
@bugaevc I don’t use Spacemacs, but this seems to be the culprit: https://www.spacemacs.org/layers/+lang/c-c++/README.html#default-mode-for-header-files. Maybe the autodetection works again if you set it to nil?
I never used Objective-C, so I haven’t a clue about that, sorry.
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