Boost C++ Libraries: Ticket #2762: impossible to build boost 1.38 for iphone

component changed; cc, owner set

René Rivera — Sun, 15 Feb 2009 19:59:58 GMT

cc John Maddock added
owner set to René Rivera
component Building Boost → config

It seems detail/endian.hpp isn't usable for anything but Unix style with glibc systems. So I'm not sure how the math lib is supposed to work on anything other than glibc. I can certainly try and make it work for ARM using Xcode. But perhaps this is a bigger problem?

John Maddock — Mon, 16 Feb 2009 10:37:06 GMT

Rene: detail/endian.hpp has cases for a wide range of processors not just for glibc based systems. Unfortunately it doesn't cover this specific case - from Googling around I've found that the iphone on arm is little-endian, but haven't found what predefined macros are defined by GCC that identify this platform. Any ideas?

John.

John Maddock — Mon, 16 Feb 2009 11:18:14 GMT

I forgot to mention that a temporary workaround would be to build with -D_LITTLE_ENDIAN=1

John.

René Rivera — Mon, 16 Feb 2009 13:21:52 GMT

Replying to johnmaddock:

Rene: detail/endian.hpp has cases for a wide range of processors not just for glibc based systems. Unfortunately it doesn't cover this specific case - from Googling around I've found that the iphone on arm is little-endian, but haven't found what predefined macros are defined by GCC that identify this platform. Any ideas?

Oh, sorry... didn't read the CPP code correctly and thought the glibc condition applied to all the code. Yes I have and idea of what the defs are <https://svn.boost.org/trac/boost/browser/sandbox/predef/boost/predef/architecture/arm.hpp>.

owner changed

René Rivera — Fri, 19 Mar 2010 14:52:41 GMT

owner changed from René Rivera to John Maddock

Sending this back to JM since I think I answered the questions.. Although I'm correcting for a name change <https://svn.boost.org/trac/boost/browser/sandbox/predef/boost/predef/architecture/arm.h>.

anonymous — Fri, 19 Mar 2010 16:37:22 GMT

Errr... so what do I actually have to do to fix this?

John.

PS boost/endian.hpp isn't really part of Boost.Config, not sure what it is a part of though...

René Rivera — Fri, 19 Mar 2010 17:12:25 GMT

Replying to anonymous:

Errr... so what do I actually have to do to fix this?

John.

PS boost/endian.hpp isn't really part of Boost.Config, not sure what it is a part of though...

I guess it's not part of anything, since it's in boost/detail. And it seems various people have edited it, weirdly including myself. I can go a head and fix it since I'm one of the few people using ARM, but it might take a while. SO I guess if you think I should fix it send it back to me :-)

owner changed

John Maddock — Fri, 19 Mar 2010 17:22:42 GMT

owner changed from John Maddock to René Rivera

Rene, I don't mind fixing it, but I'm not clear what the fix is, and I can't test here... so I'm sending it back to you... sorry!!

John.

Johan Boulé — Mon, 24 May 2010 22:15:33 GMT

gcc defines BIG_ENDIAN or LITTLE_ENDIAN I think the boost header should check for those too since it already checks for _BIG_ENDIAN and _LITTLE_ENDIAN.

anonymous — Mon, 24 May 2010 22:17:44 GMT

(about previous post, the wiki ate the double underscores around the identifiers)

status changed; resolution set

René Rivera — Wed, 26 May 2010 21:10:43 GMT

status new → closed
resolution → fixed

(In [62252]) Add detection of LITTLE/BIG_ENDIAN for GCC versions that define them. I.e. the Apple builds of Xcode/gcc. (fixes #2762)