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gh-156895: Document CXX in ./configure --help output
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‎Misc/NEWS.d/next/Build/2026-09-07-00-30-00.gh-issue-156895.Jakqud.rst‎

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Document the ``CXX`` environment variable in the :program:`configure` ``--help`` output.

‎configure‎

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‎configure.ac‎

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@@ -1148,7 +1148,7 @@ AC_CACHE_CHECK([for GCC compatible compiler],
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[ac_cv_gcc_compat=yes],
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[ac_cv_gcc_compat=no])])
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AC_SUBST([CXX])
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AC_ARG_VAR([CXX], [C++ compiler command])
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preset_cxx="$CXX"
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if test -z "$CXX"

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