GDAL in iOS, runtime dll proj4 not available, OGR functions do not work -

i have problems gdal compiled on ios ( gdal internally uses proj operations )

i'm developing ios, , want use library perform coordinate transformation, functions requires proj dll , @ runtime error :

error 6: unable load proj.4 library (libproj.dylib), creation of ogrcoordinatetransformation failed. transformation failed. 

i suppose proj dll should included static library , can't find how todo this

( other problems, mention: can't access epsg database , gcs.csv neither, setgeogcs() methos seems available set coordinate system, bu don't' know parameters should use "epsg:3003" coordinate system, "italia fuso ovest" )

cllocationcoordinate2d transform( char *s_srs, double x, double y)  {     ogrspatialreference osourcesrs, otargetsrs;     ogrcoordinatetransformation *poct;      /* osourcesrs.importfromepsg( atoi(papszargv[i+1]) );     //otargetsrs.importfromepsg( atoi(papszargv[i+2]) ); */      /*     osourcesrs.setwellknowngeogcs(s_srs);     */     osourcesrs.setgeogcs( "my geographic coordinate system",                          "wgs_1984",                          "my wgs84 spheroid",                          srs_wgs84_semimajor, srs_wgs84_invflattening,                          "greenwich", 0.0,                          "degree",                          atof(srs_ua_degree_conv) );      /*     otargetsrs.setwellknowngeogcs("wgs84");     */     otargetsrs.setgeogcs( "my geographic coordinate system",                    "wgs_1984",                    "my wgs84 spheroid",                    srs_wgs84_semimajor, srs_wgs84_invflattening,                    "greenwich", 0.0,                    "degree",                          atof(srs_ua_degree_conv) );       poct = ogrcreatecoordinatetransformation( &osourcesrs,                                              &otargetsrs );       if( poct == null || !poct->transform( 1, &x, &y ) ) {         printf( "transformation failed.\n" );         return cllocationcoordinate2dmake(x, y);     } else {         return cllocationcoordinate2dmake(x, y);     }  } 

you need download , build proj4 ios first. can point gdal ios build of proj4 using ./configure flag

--with-static-proj4=/path/to/your/libproj 

make sure path parent directory has include directory , lib directory proj4.

for instance directory on mac is:

/users/myusername/ios_builds/{device_arch}/iphoneos.platform/iphoneos.7.0.sdk 

where device arch can i386, armv7 or armv7s depending on target compiling for. directory has subdirectories of "include" , "lib", in turn have .h files , libproj.a file linking gdal.

i have script in development helping build gdal , associated libraries on github. https://github.com/afarnham/preflight

you might have make edits compilers specified in script work if don't have xcode 5 installed. of configure flags need updating gdal. should started though.