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Re: Problem with Sun Studio 12 C++

From: Eric Blake
Subject: Re: Problem with Sun Studio 12 C++
Date: Sat, 06 Jun 2009 12:52:58 -0600
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According to Eric Blake on 6/6/2009 12:42 PM:
> I'm not sure why it was done, but this appears to fix it.  I'm in the
> middle of testing a libtool bootstrap after (temporarily) removing my C++
> compiler; if everything still works, are there any objections to this patch?

Hmm - I noticed this while testing on cygwin with gcc but not g++;
remember, cygwin tends to be case-insensitive (you can request case
sensitivity, but not everyone does); I suspect a similar thing would
happen on MacOS:

checking for g++... no
checking for c++... no
checking for gpp... no
checking for aCC... no
checking for CC... CC
checking whether we are using the GNU C++ compiler... no
checking whether CC accepts -g... no
checking dependency style of CC... gcc3
checking how to run the C++ preprocessor... /lib/cpp
configure: error: in `/home/eblake/libtool':
configure: error: C++ preprocessor "/lib/cpp" fails sanity check

Looking at the config.log is more telling:

configure:12281: checking for CC
configure:12297: found /usr/bin/CC
configure:12308: result: CC
configure:12335: checking for C++ compiler version
configure:12344: CC --version >&5
CC (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
configure:12359: checking whether we are using the GNU C++ compiler
configure:12378: CC -c   conftest.cpp >&5
CC: installation problem, cannot exec 'cc1plus': No such file or directory

In my situation, CC (a C++ compiler on some platforms) is
indistinguishable from cc (a C compiler) to a case-insensitive exec(), but
gcc then pays attention to the case of argv[0] and tries to invoke the
(uninstalled) c++ helper rather than running as a C compiler, leading to
subsequent failed guesses.  So the patch needs to be tweaked - when
checking for a C++ compiler, we ought to test that the compiler can
actually perform a C++-specific compilation, not just that --version or
other trivial actions work.

Any ideas for the quickest course of action here?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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