Cannot build gdal 1.10.1 on Maverick Xcode 5.0.2

[mohpor]

Hi,
I'm working hard on compiling gdal for iOS and I ran into your python scripts (wonderful work btw) but I'm stuck with a weird issue.
let me explain the situation:
1- gdal 1.10.0 won't be compiled because of some known issues with OSX/iOS on gdal side discussed here and here
2- After changing gdal.py to reflect the need to download 1.10.1 instead of 1.10.0, when I run

python preflight.py build gdal

certain errors come up that when I investigate, I can see that the linker is trying to link standard libraries from OSX SDK (in /usr/include/sys) instead of iOS SDK (/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include/sys)! this leads to errors like _Unsupported Architecture_ in cdef.h and all.

P.S.: proj4 gets compiled for all architectures and is present in ~/iOS_libs output directory, gdal compiles for i386 & x86_64 only.
P.P.S: I have limited my Archs to armv7 for the sake of speed. I had to remove arm64 because it wouldn't pass for proj4.
same error goes for 1.10.0,1.10.1, 1.9.2

How can I overcome this issue?

I just successfully ran a build using Xcode 5.0.2 and Mavericks.

Have you run xcode-select to ensure your Xcode 5.0.2 install is the active install?

[mohpor]

Thanks for the reply,
I just checked it with another mac, this time it is built successfully for armv7, armv7s but not for arm64,
I have decided to set aside arm64 for now.
I'm guessing some env. settings must be corrupted on my other mac that makes the script fail. I may have symlinked some important paths, though, when I checked my /usr/ folder on this mac, it's very different from my problematic mac!
I'm just trying to explore gdal, it would be nice if you could provide us with the fat binary somewhere on the web for now!
thanks again

[afarnham]

Yes, I had troubles when I tried compiling it for arm64 today as well. However, like you, arm7 and arm7s compiled fine. I'll have to dig into the arm64 stuff more.

I know that in many cases the autoconf files for these projects are out of date. Proj4.9 beta has udpated autoconf files that will compile for arm64, but GDAL does not last time I checked (early January 2014)

[mohpor]

I have changed the min version to 6.0 and I'm guessing I'm going to have to make a special lib for arm64 because arm64 is not supported in iOS 6.0 SDK! am I right or I'm horribly wrong?

[afarnham]

I don't think so. iOS 6 devices will just ignore the arm64 slice of the lib as long as you have an arm7 or arm7s slice in the lib.

[mohpor]

I'm not talking about the app that'll use the lib, but about the compilation process. if I try to set the min deployment target to 6.0, it'll use the iOS 6.0 SDK for linker and arm64 is not a valid architecture for iOS 6.0! I'm not sure if I'm right. I'm no even sure if I should set min deployment version to 6.0! my app will support iOS 6 but do I have to compile libgdal for min.dep.ver. 6 or not?!

[afarnham]

Oh, I understand. You are correct. The iOS 6 SDK cannot compile for arm64.

However, you could compile a separate arm64 only lib and add it to your lib that was compiled with the iOS 6 SDK using the lipo tool.

[afarnham]

If your app supports iOS 6, you should set min deployment version to 6

[mohpor]

thanks aaron,
looks like x86_64 is not compiling too. it might help if we include --without--gif to config prefixes.

[afarnham]

I can do that next week when I have more free time or if you create a pull request with that change, I will merge it in as soon as possible (today or tomorrow).

[mohpor]

That might help with x86_64 but then again, one might need the gif lib, it's not a good idea, I'd rather remove x86_64 arch from the list altogether.
There is a minimized driver config for gdal, might worth taking a look, whenever you had the time.

[afarnham]

Fixed armv7 and armv7s builds by making sqlite3 a dependency. GDAL required a sqlite3 lib and was willing to use the MacOS X sqlite3 if necessary. By pointing to a sqlite3 built for iOS, the GDAL build system will not seek out the MacOS X version. Have not tested on arm64 yet, but I did push the changes.

[afarnham]

Also, I used Xcode 5.1 with iOS 7.1 as the minimum deployment target