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October 2007
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2007.10.23 20:56 "Re: universal build patch", by Toby Thain
On 23-Oct-07, at 4:17 PM, Andrey Kiselev wrote: > On Tue, Oct 23, 2007 at 11:12:33AM -0500, Bob Friesenhahn wrote: >>> We can easily switch to this method instead of autoconf macro. I am >>> only concerning about portability of this approach. >> >> It is 100% portable as long as you stick to using Apple's modified >> GCC >> 4.X and OS X. Other targets are of no consequence. :-) >> >> Solaris defines _LITTLE_ENDIAN or _BIG_ENDIAN by including >> <sys/types.h> > ... >> My feeling is that it the only completely correct approach is to >> configure/build on each native target since otherwise some decisions >> made may be wrong. Whether this is true can be deduced from the set of parameters determined at configure-time. >> Perhaps 32-bit OS X has managed to constrain PPC >> and Intel differences to only endian order but this is the exception >> rather than the rule. With Mac OS X Leopard (Arriving October 26) >> perhaps the rules will change (the rules for Apple always change). > > 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). For separate configures, everything already works, of course. The hitherto unsolved problem is building universally from a single configure, which is sometimes necessary. The runtime patch seems a clever solution? --Toby > 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. > > Best regards, > Andrey > > > -- > Andrey V. Kiselev > ICQ# 26871517 > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/