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Fixed bug 2146 - Enable static linking of libSDL on Android

Denis Bernard

This patch to Android.mk adds support for static linking of libSDL for Android applications. A patched readme with static build instructions is also provided.

It does not break existing build environments setup according to the README-android.txt since the static library version will not be built in not required.

The static build uses the Android NDK module system (see docs/IMPORT-MODULE.html in the NDK folder and step 5 in the instructions below).

Instructions:
1. Copy the android-project directory wherever you want to keep your projects
   and rename it to the name of your project.
2. Create a symlink to SDL/src/main/android/SDL_android_main.c as
   <project>/jni/src/SDL_android_main.c
3. Rename <project>/jni/src/Android_static.mk to <project>/jni/src/Android.mk
   (overwrite the existing one)
4. Edit <project>/jni/src/Android.mk to include your source files
5. create and export an environment variable named NDK_MODULE_PATH that points
   to the parent directory of this SDL directory. e.g.:

   export NDK_MODULE_PATH="$PWD"/..

6. Edit <project>/src/org/libsdl/app/SDLActivity.java and remove the call to
   System.loadLibrary("SDL2") line 42.
7. Run 'ndk-build' (a script provided by the NDK). This compiles the C source

Although this requires an environment variable to be setup, it can be added once and for all to the main Android.mk of the project.
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slouken committed Oct 11, 2013
1 parent a7e1fdd commit 4349cb57691125bbc24163e6a4f13b981262b2d8
Showing with 51 additions and 0 deletions.
  1. +17 −0 Android.mk
  2. +22 −0 README-android.txt
  3. +12 −0 android-project/jni/src/Android_static.mk
@@ -49,3 +49,20 @@ LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES
LOCAL_LDLIBS := -ldl -lGLESv1_CM -lGLESv2 -llog -landroid

include $(BUILD_SHARED_LIBRARY)

###########################
#
# SDL static library
#
###########################

LOCAL_MODULE := SDL2_static

LOCAL_MODULE_FILENAME := libSDL2

LOCAL_SRC_FILES += $(LOCAL_PATH)/src/main/android/SDL_android_main.c

LOCAL_LDLIBS :=
LOCAL_EXPORT_LDLIBS := -Wl,--undefined=Java_org_libsdl_app_SDLActivity_nativeInit -ldl -lGLESv1_CM -lGLESv2 -llog -landroid

include $(BUILD_STATIC_LIBRARY)
@@ -110,6 +110,28 @@ android-project/
on this implementation.


================================================================================
Build an app with static linking of libSDL
================================================================================

This build uses the Android NDK module system.

Instructions:
1. Copy the android-project directory wherever you want to keep your projects
and rename it to the name of your project.
2. Rename <project>/jni/src/Android_static.mk to <project>/jni/src/Android.mk
(overwrite the existing one)
3. Edit <project>/jni/src/Android.mk to include your source files
4. create and export an environment variable named NDK_MODULE_PATH that points
to the parent directory of this SDL directory. e.g.:

export NDK_MODULE_PATH="$PWD"/..

5. Edit <project>/src/org/libsdl/app/SDLActivity.java and remove the call to
System.loadLibrary("SDL2") line 42.
6. Run 'ndk-build' (a script provided by the NDK). This compiles the C source


================================================================================
Customizing your application name
================================================================================
@@ -0,0 +1,12 @@
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := main

LOCAL_SRC_FILES := YourSourceHere.c

LOCAL_STATIC_LIBRARIES := SDL2_static

include $(BUILD_SHARED_LIBRARY)
$(call import-module,SDL)LOCAL_PATH := $(call my-dir)

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