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

Issue này trỏ đến configure.ac và ./configure --help; trước tiên hãy đọc phần xử lý CXX trong configure.ac và kiểm tra đầu ra trợ giúp được tạo. Công việc được xem là hoàn tất khi đầu ra trợ giúp có tài liệu về CXX; PR gh-157046 đã được liên kết, vì vậy hãy kiểm tra trạng thái của PR trước khi bắt đầu.