[New-bugs-announce] [issue25946] configure should pick /usr/bin/g++ automatically if present

[Karl Richter]

New submission from Karl Richter:

`./configure` both prints `checking for g++... no` and 

    WARNING:
    
      By default, distutils will build C++ extension modules with "g++".
      If this is not intended, then set CXX on the configure command line.

if `/usr/bin/g++` is present and executable which doesn't seem to be constructive because it's quite common that one wants to use `/usr/bin/g++` as CXX compiler if available. In case incompatibilities exists with other C++ compilers there should a check and more detailed error message.

Furthermore the error message doesn't explain if a part of distutils won't be build because the message sounds like the C++ extension is built, but does it work without a C++ compiler?

Specifying `CXX` environment variable or `--with-cxx-main=/usr/bin/g++` `configure` option works fine.

experienced with 8a2e735 (on branch 2.7)

----------
components: Build
messages: 256977
nosy: krichter
priority: normal
severity: normal
status: open
title: configure should pick /usr/bin/g++ automatically if present
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25946>
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