[gdal-dev] Cannot compile 1.10 for iOS due to missing crt_extern

[Nik Sands]

Hi Even,

Your suggestion has helped a little, but I still can't compile for iOS (device).  I'm getting the following at the end of the build output...


libtool: compile:  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++ -arch armv7 -pipe -Os -gdwarf-2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -mno-thumb -mthumb-interwork -Wall -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/port -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/gcore -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/alg -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/ogr -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/ogr/ogrsf_frmts -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/frmts -DOGR_ENABLED -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/port -c commonutils.cpp -o commonutils.o
/bin/sh /Users/nsands/Documents/Nik/Development/gdal-1.10.0/libtool --mode=link	/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++ -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk gdalinfo.lo commonutils.lo  /Users/nsands/Documents/Nik/Development/gdal-1.10.0/libgdal.la -o gdalinfo
libtool: link: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++ -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk gdalinfo.o commonutils.o -o gdalinfo  /Users/nsands/Documents/Nik/Development/gdal-1.10.0/.libs/libgdal.a -lsqlite3 -lz -lpthread -ldl -liconv -lxml2
Undefined symbols for architecture armv7:
  "_clock$UNIX2003", referenced from:
      IVFKDataBlock::LoadGeometry()       in libgdal.a(vfkdatablock.o)
ld: symbol(s) not found for architecture armv7
collect2: ld returned 1 exit status
make[1]: *** [gdalinfo] Error 1
make: *** [apps-target] Error 2


How can I get this resolved?

Cheers,
Nik.


On 12/08/2013, at 4:12 PM, Even Rouault <even.rouault at mines-paris.org> wrote:

> Le lundi 12 août 2013 02:17:33, Nik Sands a écrit :
>> Hi list members,
>> 
>> I was able to build GDAL 1.9 for iOS, and I can build 1.10 for the iOS
>> simulator, however I cannot compile GDAL 1.10 for the actual iOS
>> (devices).  It appears that this is because crt_extern is not included in
>> iOS.
>> 
>> The code that trips up the build is in 'cpl_spawn.cpp' and appears to be:
>> 
>> 	#ifdef __APPLE__
>> 	#include <crt_externs.h>
>> 
>> The last few lines of the build output are below.
>> 
>> Is there some way that I can get GDAL 1.10 built for iOS?  I really need
>> one of the changes that was included in this version.
>> 
>> Thanks in advance for any advice that you may be able to provide.
> 
> Nick,
> 
> Maybe you can try the patch at 
> https://github.com/joyent/libuv/pull/321#issuecomment-4155600 that has very 
> similar code that the one in GDAL and report if it works for you so it can get 
> integrated ?
> 
> Even
> 
>> 
>> Cheers,
>> Nik.
>> 
>> 
>> libtool: compile: 
>> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Dev
>> eloper/usr/bin/g++ -arch armv7 -pipe -Os -gdwarf-2 -isysroot
>> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Dev
>> eloper/SDKs/iPhoneOS6.1.sdk -mno-thumb -mthumb-interwork -Wall
>> -DOGR_ENABLED -I/Users/nsands/Documents/Nik/Development/gdal-1.10.0/port
>> -DHAVE_LIBZ -I/usr/include/libxml2 -DHAVE_LIBXML2 -c cpl_spawn.cpp -o
>> cpl_spawn.o cpl_spawn.cpp:465:25: error: crt_externs.h: No such file or
>> directory cpl_spawn.cpp: In function 'CPLSpawnedProcess* CPLSpawnAsync(int
>> (*)(CPL_FILE_HANDLE, CPL_FILE_HANDLE), const char* const*, int, int, int,
>> char**)': cpl_spawn.cpp:727: error: '_NSGetEnviron' was not declared in
>> this scope make[1]: *** [cpl_spawn.lo] Error 1
>> make: *** [port-target] Error 2
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> 
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