[Gcl-devel] Amusing bug

[Gregory Wright]

Hi,

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
out...

        ...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
        locations.

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,

Greg



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Gregory Wright
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