How to discover whether a language compiler was actually found

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How to discover whether a language compiler was actually found

Reuben Thomas
I have a project with some optional Objective C++.

If I simply use AC_PROG_OBJCXX, then if it finds no Objective C++ compiler,
it still sets OBJCXX=g++.

I can't see a documented way to find out whether an actual compiler was
found. Am I missing something?

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