android libpng16,Building+linking libpng in Android Studio with CMake on Windows

红太狼 2022-10-05 05:49 21阅读 0赞

I'm trying to start a native app project with Android Studio and CMake on Windows 10, but I'm stuck at including libpng.

For starters it's the first time I've seen a CMakeLists.txt file. It took me a day to figure out target\_link\_libraries(native-activity ... png) could not be target\_link\_libraries(png native-activity ...) since all the error messages were about files not being created and commands failing due to missing requirements from the toolchain (why were the essential errors at the end of the list? not cool!).

After finally managing to include libpng in the project I now get a build error:

Error:Execution failed for task ':app:externalNativeBuildDebug'.

...

error: unknown target CPU 'armv5te'

CMake Error at scripts/genout.cmake:78 (message):

Failed to generate

C:/APP\_PATH/app/libpng-1.6.28/build/scripts/symbols.out.tf1

ninja: build stopped: subcommand failed.

I've recursively grep'ed my project, .android, .AndroidStudio2.2 directories, as well as filenames, and found absolutely nothing with armv5te except for the genout.cmake. My abiFilters line is abiFilters 'x86'.

How do I build libpng to link to my native app? Also, in Android Studio it shows the project now includes the libpng source files (with no less than 9 projects dedicated to it!). Is there any way to remove it?

Here is my CMakeLists.txt:

cmake\_minimum\_required(VERSION 3.4.1)

\# build native\_app\_glue as a static lib

add\_library(app-glue STATIC $\{ANDROID\_NDK\}/sources/android/native\_app\_glue/android\_native\_app\_glue.c)

set(png\_src\_dir ../../../../libpng-1.6.28)

set(PNG\_STATIC ON)

add\_subdirectory($\{png\_src\_dir\} $\{png\_src\_dir\}/build)

\# now build app's shared lib

set(CMAKE\_CXX\_FLAGS "$\{CMAKE\_CXX\_FLAGS\} -std=gnu++14")

add\_library(native-activity SHARED

main.cpp logger.cpp logger.h game.cpp game.h

shaders.cpp shaders.h assets.cpp assets.h)