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[Gcl-devel] Amusing bug

From: Gregory Wright
Subject: [Gcl-devel] Amusing bug
Date: 21 Jun 2002 16:42:19 -0400


While building maxima from cvs I came across an amusing bug. Here it is:

The maxima build failed while building float.lisp. It failed with a
syntax error in a file included from /usr/include/math.h. It turns

        ...that math.h includes a file float.h (via #include <float.h>)

        ...that gcl also makes file float.h and includes it via
        #include "float.h".

        ...but gcl calls gcc with an explicit -I. which causes the
        current directory to be searched before any of the standard

The end result being that the float.h file included by math.h is the
local one (the result of compiling a lisp file float.lisp) and not the
one expected (typically in /usr/lib/gcc-lib...).

According the gcc doc, files included by #include ".." search from the
current directory, so an explicit -I. shouldn't be required.

Is there a subtlety in this that I'm not seeing?

Best Wishes,



Gregory Wright
Chief Technical Officer
PacketStorm Communications, Inc.
20 Meridian Road
Eatontown, New Jersey 07724

1 732 544-2434 ext. 206
1 732 544-2437 [fax]

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