gh-156895: Document CXX in ./configure --help output - #157046
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September 6, 2026 19:59
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configure.acdetects and usesCXXfor the C++ compiler, but never declares it withAC_ARG_VAR, so./configure --helpnever lists it next toCC. This addsAC_ARG_VAR([CXX], [C++ compiler command])so it shows up the same wayCCalready does, and regeneratesconfigurewith autoconf 2.72.Fixes #156895