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AC_PROG_CXX should have a way to not fall back to g++

From: Wouter Verhelst
Subject: AC_PROG_CXX should have a way to not fall back to g++
Date: Wed, 29 Aug 2018 11:13:22 +0200
User-agent: Mutt/1.10.1 (2018-07-13)

I received a bug report [1] that configure finished successfully, but
that the C++ compiler was not found. I noticed that this is documented
behaviour [2]: if AC_PROG_CXX doesn't find a C++ compiler, it falls back
to g++ as a default.

I'm not sure why this behaviour was chosen; however, I think it's a bad
idea. If configure runs to completion, people rightly expect that things
will compile successfully. On modern GNU/Linux distributions, users may
optionally not install the full GNU compiler collection; in such cases,
having a configure script that fails to notice that there's no C++
compiler is annoying.

I'm sure that for backwards compatibility, changing the default
behaviour of the AC_PROG_CXX macro is not an option right now. However,
it should be possible to make it accept a second parameter, or to
provide an alternative version of this macro (say, AC_PROG_CXX_REQUIRED
or some such) that allows to make it not exhibit this problematic


[1] https://github.com/Fedict/eid-mw/issues/78

Could you people please use IRC like normal people?!?

  -- Amaya Rodrigo Sastre, trying to quiet down the buzz in the DebConf 2008

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