qmake and linking against Android zlib

SeeLook

Hi,

What a statement I have to put in qmake to link against /system/libs/libz.so for any Android target?

All compiles fine, #include <zlib.h> works out of the box without any additional INCLUDEPATH
but linking fails.
All Android docs say zlib is part of Android NDK.

SGaist

Hi,

AFAIK

LIBS += -lz

should be enough if zlib is Androïd standard library.

SeeLook

Not that easy,
LIBS += -lz doesn't work - still the same linking error.

I found that library in the location:
toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android/30/
of the NDK
or actually, inside many locations with different numbers and architectures.
Probably some -Lsomewhere has to prelude -lz

SeeLook

I found the solution:

My project was already linked with zlib and probably all Qt Android projects are,
so the statement LIBS += -lz is not necessary at all.

I was trying to compile minizip library (part of zlib project) but Android doesn't support fopen64.
The solution was to add USE_FILE32API to definitions to say minizip not to use that.
Adding to my qmake: DEFINES += USE_FILE32API solved linking errors.