Nik,
Which symbols is the linker complaining about? I build regularly for iOS
(although not using CMake directly), linking with the system copy of
libxpat and libxml2 and I haven’t noticed any link or operational
failures in 3.5.0. Admittedly, I use a subset of the drivers, but if you
can send the linker errors, I can check to see why I'm not having the
problem you are, maybe it'll give us a clue.
Cheers,
-Gaige
On 2022-07-07 20:38, Nik Sands wrote:
Hi GDAL devs,
I’ve built GDAL 3.5 for iOS (device and simulator) but I’ve found that
when incorporating libgdal into my iOS app, there are several errors
related to undefined symbols, all of which are XML related.
My guess is that the libexpat included in Apple’s SDK is missing some
symbols that GDAL requires, therefore I’ve now built my own libexpat.
Now I’m attempting to rebuild GDAL using my own libexpat, using the
cmake configuration command:
==========
cmake -DCMAKE_TOOLCHAIN_FILE=$CMTOOLCHAIN \
-DPLATFORM=$OS \
-DENABLE_BITCODE=OFF \
-DCMAKE_INSTALL_PREFIX=$PREFIX \
-DBUILD_APPS=OFF \
-DBUILD_SHARED_LIBS=OFF \
-DBUILD_PYTHON_BINDINGS=OFF \
-DPROJ_ROOT=$PREFIX \
-DEXPAT_INCLUDE_DIR=$PREFIX/include \
-DEXPAT_LIBRARY=$PREFIX/lib/libexpat.dylib \
-DSQLITE3_INCLUDE_DIR=$PREFIX/include \
-DSQLITE3_LIBRARY=$PREFIX/lib/libsqlite3.a \
-DIconv_INCLUDE_DIR=$SDKPATH/usr \
-DIconv_LIBRARY=$SDKPATH/usr/lib/libiconv.tbd \
-DCMAKE_BUILD_TYPE=Release \
..
==========
However, when this completes, it tells me that it has ignored the two
libexpat arguments that I supplied to it:
==========
-- Configuring done
-- Generating done
CMake Warning:
Manually-specified variables were not used by the project:
EXPAT_INCLUDE_DIR
EXPAT_LIBRARY
-- Build files have been written to: ...
==========
Why would it be ignoring these arguments and how can I get it to use
my own libexpat instead of the default SDK libexpat?
Cheers,
Nik.
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