Configure script output doesn't mention CXX

Bug report

Bug description:

I was having trouble getting test_cppext to pass on both my Mac and Ubuntu laptops. (Oddly enough, while running that test in isolation, it passed.) It succeeded on my Raspberry Pi. Trying to figure out what I'd done wrong, I noticed that I was setting CC=clang except on the Pi, but wasn't specifying a C++ compiler. I don't know what logic configure uses to set the C++ compiler if CC is set, but figured I could probably override it. ./configure --help doesn't mention anything C++-related, but CXX is referenced in configure.ac.

Thinking I'd hit on the solution by specifying CXX=clag++, I tried again. Alas, I still get the test_cppext failure and will continue to hunt for that problem. Nevertheless, it seems to me that ./configure --help should mention the CXX variable.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS, Linux

Linked PRs

• gh-157046

この issue は configure.ac と ./configure --help を指しています。まず configure.ac での CXX の処理を読み、生成されたヘルプ出力を確認してください。ヘルプ出力に CXX が記載されていれば完了です。PR gh-157046 はすでにリンクされているため、開始する前にそのステータスを確認してください。