2007.10.24 07:19 "Re: [Tiff] universal build patch", by Andrey Kiselev

On Tue, Oct 23, 2007 at 03:44:33PM -0500, Bob Friesenhahn wrote:

I am sure that AC_C_BIGENDIAN macro can deduce the target byte order using some heuristics (that macro works in case of cross-compilation). So it can be adopted for OS X case too. The only problem for me is that I do not have a proper environment to develop and test such a macro. It shouldn't be too complicated. So my preference is to modify a test rather than libarary itself. I don't see any serious reason to replace the compile time switch.

The problem seems to be that the compiler is run just "once" with same options and header files to produce object code for completely different targets. Any executables that configure builds and runs in order to implement tests will be tested on the current host CPU/OS. That is why there is a problem. The problem is not limited to endianness, although that is the most obvious issue.

Ah, I see now. But I am sure that it still can be addressed at configure stage. It seems that latest autoconf already has some support for universal binary case:

 http://lists.gnu.org/archive/html/autoconf-patches/2007-02/msg00023.html

It is not a complete solution, but it should work for libtiff I think (few changes in sources required).

Best regards,

Andrey

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Andrey V. Kiselev
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