Hi Karl, * Karl Berry wrote on Tue, Apr 22, 2008 at 01:29:27AM CEST: > I'm not sure if this is really a bug, but I thought I'd mention it. It > seems that autoconf 2.62 checks headers for "presence" even if they are > already determined to have "usability".
Then the text of the output is not good enough. The first check is a compile check, the second one a preprocess check. If they disagree in one way or another, you get a warning. Until several years ago, that warning said to write to bug-autoconf if the package author didn't provide a bug report address. From the mail echo that this provokes to this day, I would say that "present but cannot be compiled" is much more likely to happen than "accepted by the compiler, rejected by the preprocessor", but both happen. The latter typically with challenged or wrong preprocessor settings (e.g., /lib/cpp on Solaris). Hope that helps. Cheers, Ralf
