[gdal-dev] Build GDAL 3.5 for iOS error: forward declaration of 'stat64'

[Even Rouault]

Nik,

in cmake/helpers/configure.cmake, there's a special case of Darwin at 
line 183 in master

   if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")

Can you test if replacing it with

   if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR ${CMAKE_SYSTEM_NAME} 
MATCHES "iOS")

works better? (I assume CMAKE_SYSTEM_NAME = iOS from 
https://cmake.org/cmake/help/latest/variable/IOS.html , but you might 
want to add a 'message(WARNING 
"CMAKE_SYSTEM_NAME=${CMAKE_SYSTEM_NAME}")' debug statement to check

Even

Le 05/07/2022 à 06:14, Nik Sands a écrit :
> Hi GDAL devs,
>
> As per my earlier emails, I’m attempting to build GDAL 3.5 for iOS.  The complete process (so far) for this is below, at the end of this email.
>
> A quick summary of some relevant points is:
> •  Using a 3rd party cmake toolchain file which caters for iOS, macOS (as well as other Apple OSs) and can even build a fat binary that works for both iOS device and simulator (arm64/x86_64).
> •  Using a 3rd party mirror of SQLite which includes cmake configuration, so that I can incorporate the same methodology to build iOS SQLite that I’m using for other dependencies (the standard Apple bundled SQLite throws an error when building GDAL)
>
> The 'cmake <options> ..’ succeeds to configure the GDAL build.  However, when I run ‘cmake —build .’ I get the following output:
>
> ==========
> [  0%] Built target generate_gdal_version_h
> [  0%] Building CXX object apps/CMakeFiles/appslib.dir/gdalinfo_lib.cpp.o
> [  0%] Building CXX object apps/CMakeFiles/appslib.dir/gdalbuildvrt_lib.cpp.o
> [  1%] Building CXX object apps/CMakeFiles/appslib.dir/gdal_grid_lib.cpp.o
> /Users/nsands/Documents/Development/3rdParty/GDAL3/gdal-3.5.0/apps/gdal_grid_lib.cpp:1213:26: error: variable has incomplete type 'VSIStatBufL' (aka 'stat64')
>              VSIStatBufL  sStat;
>                           ^
> /Users/nsands/Documents/Development/3rdParty/GDAL3/gdal-3.5.0/port/cpl_vsi.h:195:16: note: forward declaration of 'stat64'
> typedef struct VSI_STAT64_T VSIStatBufL;
>                 ^
> /Users/nsands/Documents/Development/3rdParty/GDAL3/gdal-3.5.0/build/port/cpl_config.h:41:22: note: expanded from macro 'VSI_STAT64_T'
> #define VSI_STAT64_T stat64
>                       ^
> 1 error generated.
> make[2]: *** [apps/CMakeFiles/appslib.dir/gdal_grid_lib.cpp.o] Error 1
> make[1]: *** [apps/CMakeFiles/appslib.dir/all] Error 2
> make: *** [all] Error 2
> ==========
>
> I found a GDAL bug that appears to be related, but it was closed as ‘fixed’ about 8 years ago:
> https://trac.osgeo.org/gdal/ticket/1005
>
> This may also be relevant:
> https://www.spinics.net/lists/dash/msg02117.html
>
> But this is somewhat beyond my (lack of) expertise to resolve.  Does anybody have any suggestions for resolving this issue?
>
> Cheers,
> Nik.
>
>
> COMPLETE PROCESS TO BUILD iOS GDAL (so far):
>
>
> Install Homebrew package manager:
> /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
>
> Install cmake using Homebrew:
> brew install cmakecmake --build . --target install
>
> Install ios.toolchain.cmake:
> Download from:  https://github.com/leetal/ios-cmake
> Install at:  $HOME/Documents/Development/3rdParty/ios-cmake-master/ios.toolchain.cmake
>
> Environment Variables:
> export PREFIX=$HOME/build/arm64
> export CMTOOLCHAIN=$HOME/Documents/Development/3rdParty/ios-cmake-master/ios.toolchain.cmake
>
> Build SQLite:
> Download CMAKE-compatible SQLite amalgamation from:
> https://github.com/azadkuh/sqlite-amalgamation
>
> cd sqlite-amalgamation-master
> mkdir build
> cd build
> cmake -DCMAKE_TOOLCHAIN_FILE=$CMTOOLCHAIN -DPLATFORM=OS64 -DCMAKE_INSTALL_PREFIX=$PREFIX -DSQLITE_ENABLE_RTREE=ON ..
> cmake --build .
> cmake --build . --target install
>
> Build Proj:
> cd proj-{VERSION}
> mkdir build
> cd build
> cmake -DCMAKE_TOOLCHAIN_FILE=$CMTOOLCHAIN -DPLATFORM=OS64 -DCMAKE_INSTALL_PREFIX=$PREFIX -DENABLE_TIFF=OFF -DENABLE_CURL=OFF -DBUILD_PROJSYNC=OFF -DSQLITE3_INCLUDE_DIR=$PREFIX/include -DSQLITE3_LIBRARY=$PREFIX/lib/libsqlite3.a ..
> cmake --build .
> cmake --build . --target install
>
> Build GDAL:
> (Specifying the path to PROJ is not required because cmake automatically adds CMAKE_INSTALL_PREFIX to CMAKE_SYSTEM_PREFIX_PATH
>
> cd gdal-{VERSION}
> mkdir build
> cd build
> cmake -DCMAKE_TOOLCHAIN_FILE=$CMTOOLCHAIN -DPLATFORM=OS64 -DCMAKE_INSTALL_PREFIX=$PREFIX/arm64 -DBUILD_APPS=OFF -DBUILD_SHARED_LIBS=OFF -DBUILD_PYTHON_BINDINGS=OFF -DSQLITE3_INCLUDE_DIR=$PREFIX/include -DSQLITE3_LIBRARY=$PREFIX/lib/libsqlite3.a -DCMAKE_BUILD_TYPE=Release ..
> cmake --build .
> cmake --build . --target install
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/gdal-dev

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