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Re: AC_PROG_CXX doesn't check whether what it finds is actually a C++ co
Re: AC_PROG_CXX doesn't check whether what it finds is actually a C++ compiler
Fri, 28 Jun 2013 14:46:38 -0600
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On 06/28/2013 11:11 AM, Guy Harris wrote:
[Can you convince your mailer to wrap long lines?]
> If you are on a system that
> 1) doesn't have a program named g++, c++, gpp, or aCC installed;
> 2) does have a C compiler named cc installed;
> 3) has that program on a case-insensitive file system;
> AC_PROG_CXX will misidentify cc as being a C++ compiler, as its search for CC
> will find cc (due to the case-insensitive file system) but will not try to
> compile a program containing C++-specific features with it.
> (This was found by a somewhat artificial test, in which, on an OS X system
> with the default case-insensitive root file system, I temporarily renamed g++
> and c++ so that AC_PROG_CXX wouldn't find them, and ran a configure script.
> Whether this is something to be concerned about in the real world is another
Not entirely artificial; this has been reported several times on the
Cygwin mailing lists as well.
I will point out that gnulib provides a nicer module for actually
detecting c++ (and not misidentifying 'cc' as a case-insensitive 'CC'
Maybe we should investigate pulling some of that code into autoconf proper?
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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