Qhull and scripts/geometry

[Petr Mikulik]

On Tue, 20 Jan 2009, John W. Eaton wrote:

> On 20-Jan-2009, Petr Mikulik wrote:
> 
> | Yes; configuring Qhull with
> | 	CFLAGS="-fno-strict-aliasing -O2" ./configure $*
> | does not crash the testing command
> |      rbox c D3 | qconvex s G
> | 
> | 
> | Could Octave's ./configure test the Qhull library? I propose that if the 
> | above test command (or some C++ source test case) crashes, then Octave does 
> | not link to Qhull library and writes a hint like
> |   Crashing Qhull found; please recompile the Qhull library by
> | 	CFLAGS="-fno-strict-aliasing -O2" ./configure; make
> 
> Can you provide an autoconf macro that does the test and does not
> require an external program?  My Debian sysstem has the library but
> the test programs are not installed.
> 
> There is also the issue that running test programs limits the
> usefulness of configure scripts when cross-compiling.  In this case, I
> guess we would just have to assume that the library works when cross
> compiling.

I've prepared the shortest code that leads to crash if the Qhull library has 
been compiled without the appropriate CFLAGS.

Usage:
    gcc -o QhullCrashTest QhullCrashTest.c -lqhull -lm
    echo "2 4 -0.5 -0.5 -0.5 0.5 0.5 -0.5 0.5 0.5" | ./QhullCrashTest

If it crashes, nothing is written on stdout.
If it does not crash, an "OK message" is written on stdout.

Could this testing program be used in the Octave configure?
I don't know how to write an autoconf macro for it.

---
PM
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