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pelya avatar pelya commented on July 29, 2024

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1000283 avatar 1000283 commented on July 29, 2024

I had already done those, to no avail.

At the moment i'm using

#include <SDL/SDL.h>
#define main SDL_main

and also had

int SDL_main(int argc, char* argv[])
{
    main(argc,argv);
}

My main is int main(int argc, char* argv[]), the liking error is not thrown by my app's code, but that may or may not be misleading.

jni/../jni/sdl_main/sdl_main.c:138: error: undefined reference to 'SDL_main'
jni/../jni/sdl_main/sdl_main.c:58: error: undefined reference to 'SDL_main'
jni/../jni/sdl_main/SDL_android_main.cpp:37: error: undefined reference to 'SDL_main'

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pelya avatar pelya commented on July 29, 2024

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1000283 avatar 1000283 commented on July 29, 2024

No, didn't help.

This is the offending line:

/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -v -Wl,-soname,libsdl_main.so -shared 
	./obj/local/armeabi-v7a/objs/sdl_main/sdl_main.o 
	./obj/local/armeabi-v7a/objs/sdl_main/SDL_android_main.o 
	-lgcc -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -latomic -Wl,--exclude-libs,libatomic.a 
	./obj/local/armeabi-v7a/libsdl-1.2.so 
	./obj/local/armeabi-v7a/libapplication.so 
	-target armv7-none-linux-androideabi16 -no-canonical-prefixes    
	-Wl,--build-id   -nostdlib++ -Wl,--no-undefined -Wl,--fatal-warnings -llog -lc -lm 
	-o ./obj/local/armeabi-v7a/libsdl_main.so
Android (6317467 based on r365631c1) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project e0caee08e5f09b374a27a676d04978c81fcb1928) (based on LLVM 9.0.8svn)
Target: armv7-none-linux-android16
Thread model: posix
InstalledDir: /home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin
Found candidate GCC installation: /home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x
Selected GCC installation: /home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x
Candidate multilib: thumb;@mthumb
Candidate multilib: armv7-a;@march=armv7-a
Candidate multilib: armv7-a/thumb;@march=armv7-a@mthumb
Candidate multilib: .;
Selected multilib: armv7-a;@march=armv7-a
	"/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld" 
	-z noexecstack -EL --warn-shared-textrel -z now -z relro -X --hash-style=gnu --hash-style=both --enable-new-dtags --eh-frame-hdr -m armelf_linux_eabi -shared 
	-o ./obj/local/armeabi-v7a/libsdl_main.so 
	/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib/arm-linux-androideabi/16/crtbegin_so.o 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/9.0.8/lib/linux/arm 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/armv7-a 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/../lib/armv7-a
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib/arm-linux-androideabi/16 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib/arm-linux-androideabi 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib/../lib 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib/arm-linux-androideabi/../../lib 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/armv7-a 
	-L/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib 
	-soname libsdl_main.so 
	./obj/local/armeabi-v7a/objs/sdl_main/sdl_main.o 
	./obj/local/armeabi-v7a/objs/sdl_main/SDL_android_main.o 
	-lgcc --exclude-libs libgcc.a --exclude-libs libgcc_real.a -latomic --exclude-libs libatomic.a 
	./obj/local/armeabi-v7a/libsdl-1.2.so 
	./obj/local/armeabi-v7a/libapplication.so 
	--build-id --no-undefined --fatal-warnings -llog -lc -lm -lm -lgcc -ldl -lc -lgcc -ldl 
	/home/myuser/Android/Sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib/arm-linux-androideabi/16/crtend_so.o

And the resulting error:

jni/../jni/sdl_main/sdl_main.c:138: error: undefined reference to 'SDL_main'
jni/../jni/sdl_main/sdl_main.c:58: error: undefined reference to 'SDL_main'
jni/../jni/sdl_main/SDL_android_main.cpp:37: error: undefined reference to 'SDL_main'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

Looking at sdl_main.c it does #include "SDL_main.h" and i assume "" will look into -I paths (although i thought it meant "same dir as file"), and i see a lot of -Ijni/../jni/sdl-1.2/include so it should be ok.

I made the following changes to project/jni/application/myuser/AndroidAppSettings.cfg

	# Specify architectures to compile, 'all' or 'y' to compile for all architectures.
	# Available architectures: armeabi-v7a arm64-v8a x86 x86_64
	MultiABI='all'

	# Aditional CFLAGS for application
	AppCflags='-Dmain=SDL_main -DBYPASS_PROTECTION'

	# Aditional C++-specific compiler flags for application, added after AppCflags
	AppCppflags=''

	# Additional LDFLAGS for application
	AppLdflags='-z defs'

But from what i can see, the LD flags only apply to libapplication.so.
The remaining .so files seem to have a lot of undefined symbols:

$ nm -C -u project/obj/local/armeabi-v7a/objs/sdl_main/sdl_main.o 
         U __aeabi_memclr
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr1
         U __android_log_print
         U chdir
         U exit
         U malloc
         U SDL_ANDROID_JavaVM
         U SDL_ANDROID_MultiThreadedVideoLoop
         U SDL_ANDROID_MultiThreadedVideoLoopInit
         U SDL_CreateThread
         U SDL_main
         U setenv
         U __stack_chk_fail
         U __stack_chk_guard
         U strchr
         U strcpy
         U strdup
         U strlen
$ nm -C -u project/obj/local/armeabi-v7a/objs/sdl_main/SDL_android_main.o
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr1
         U __android_log_print
         U SDL_Android_Init
         U SDL_main
         U __stack_chk_fail
         U __stack_chk_guard
         U strdup
$ nm -C -u project/obj/local/armeabi-v7a/libsdl-1.2.so
         U abort
         U __aeabi_memclr
         U __aeabi_memclr4
         U __aeabi_memclr8
         U __aeabi_memcpy
         U __aeabi_memcpy4
         U __aeabi_memmove4
         U __aeabi_memset
         U __android_log_print
         U atoi
         U calloc
         U clock_gettime
         U __cxa_atexit
         U __cxa_finalize
         U dladdr
         U dlclose
         U dlerror
         U dlopen
         U dlsym
         U __errno
         U fclose
         U ferror
         U fflush
         U fmaxf
         U fminf
         U fopen
         U fprintf
         U fread
         U free
         U fseek
         U ftell
         U fwrite
         U getenv
         U gettimeofday
         U glActiveTexture
         U glBindTexture
         U glBlendFunc
         U glColor4f
         U glDeleteTextures
         U glDisable
         U glDisableClientState
         U glDrawArrays
         U glDrawTexiOES
         U glEnable
         U glEnableClientState
         U glGenTextures
         U glGetError
         U glGetIntegerv
         U glGetString
         U glLoadIdentity
         U glMatrixMode
         U glOrthof
         U glPixelStorei
         U glPopMatrix
         U glPushMatrix
         U glReadPixels
         U glTexCoordPointer
         U glTexEnvf
         U glTexImage2D
         U glTexParameteri
         U glTexParameteriv
         U glTexSubImage2D
         U glVertexPointer
         U glViewport
         U __gnu_Unwind_Find_exidx
         U log
         U malloc
         U memcmp
         U nanosleep
         U pow
         U pthread_attr_destroy
         U pthread_attr_init
         U pthread_attr_setdetachstate
         U pthread_cond_broadcast
         U pthread_cond_destroy
         U pthread_cond_init
         U pthread_cond_signal
         U pthread_cond_timedwait
         U pthread_cond_wait
         U pthread_create
         U pthread_exit
         U pthread_join
         U pthread_kill
         U pthread_mutexattr_init
         U pthread_mutexattr_settype
         U pthread_mutex_destroy
         U pthread_mutex_init
         U pthread_mutex_lock
         U pthread_mutex_unlock
         U pthread_self
         U pthread_sigmask
         U qsort
         U raise
         U realloc
         U sem_destroy
         U sem_getvalue
         U sem_init
         U sem_post
         U sem_timedwait
         U sem_trywait
         U sem_wait
         U __sF
         U snprintf
         U __stack_chk_fail
         U __stack_chk_guard
         U strcasecmp
         U strchr
         U strcmp
         U strdup
         U strlcpy
         U strlen
         U strncpy
         U strstr
         U tolower
         U toupper
         U truncf
$ nm -C -u project/obj/local/armeabi-v7a/libapplication.so
         U __cxa_atexit
         U __cxa_finalize

Also, i have these libs installed system-wide:

# sudo apt list --installed | grep sdl

	libsdl-gfx1.2-5/xenial,now 2.0.25-5 amd64 [installed,automatic]
	libsdl-gfx1.2-dev/xenial,now 2.0.25-5 amd64 [installed]
	libsdl-image1.2/xenial-updates,xenial-security,now 1.2.12-5+deb9u1ubuntu0.16.04.1 amd64 [installed,automatic]
	libsdl-image1.2-dev/xenial-updates,xenial-security,now 1.2.12-5+deb9u1ubuntu0.16.04.1 amd64 [installed]
	libsdl-ttf2.0-0/xenial,now 2.0.11-3 amd64 [installed,automatic]
	libsdl-ttf2.0-dev/xenial,now 2.0.11-3 amd64 [installed]
	libsdl1.2-dev/xenial-updates,xenial-security,now 1.2.15+dfsg1-3ubuntu0.1 amd64 [installed]
	libsdl1.2debian/xenial-updates,xenial-security,now 1.2.15+dfsg1-3ubuntu0.1 amd64 [installed,automatic]

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pelya avatar pelya commented on July 29, 2024

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1000283 avatar 1000283 commented on July 29, 2024

My project builds an executable, not a shared library.
I'm not using a custom build script or AndroidBuild.sh, i'll give that a try.

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pelya avatar pelya commented on July 29, 2024

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1000283 avatar 1000283 commented on July 29, 2024

I see a lot of mv appbinary libapplication.so in many AndroidBuild.sh files. I don't think an ELF binary is equivalent to a .so, is it? So i assume there's a lot of magic surrounding the wrapping process. Or should my appbinary be first compiled to arm instead of x86?

Anyway i compiled the executable to x86 linux (using the usual procedure for it) and used AndroidBuild.sh to rename it to .so.
I set the CustomBuildScript=y and it compiled (a lot of SDL stuff) and proceded to create an apk. Which crashes.

The executable needs extra libs and i've seen in the readme i'll have to add them to program/jni and tinker with the Android.mk files, but can these libs be system libs (x86) or must they be arm(*)? I'm asking 'cos i've seen errors like "can't find file" or "unrecognized format" on libs that exist on my system, which leads me to think this is an architecture issue.

Or does the NDK abstract away the architecture?

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pelya avatar pelya commented on July 29, 2024

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1000283 avatar 1000283 commented on July 29, 2024

Yes, it's a PEBKAC. I was confusing the concept of "native".

My app compiles for x86 linux and windows. There are a lot of #ifdef _ANDROID_ in the code, but i haven't gotten it to compile to arm yet.

I think the error: undefined reference to 'SDL_main' is the linker trying to link different architectures (my app's x86 and the to-be-generated armeabi-v7a).

A previous apk does have all libs and libapplication.so as arm, so... back to digital archaeology. :)

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1000283 avatar 1000283 commented on July 29, 2024

The way i ended up fixing my issues was by making sure my app compiles with clang (had to fix some bugs 'cos clang seems to be pickier than gcc), change some flags and have the app be built by ./build.sh and custom build script.

export ANDROID_NDK_HOME=${ANDROID_HOME}/ndk/21.1.6352462
export PATH=${ANDROID_NDK_HOME}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools:${JAVA_HOME}/bin:${PATH}
export PATH=${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/linux-x86_64/bin:${PATH}

export CXX=clang++
export CXXFLAGS="-DNDEBUG -g2 -O3 -fstack-protector-all"

Also some changes to the Makefile 'cos of clang:

CXXFLAGS = std=gnu++11
CFLAGS = -stdlib=libc++ -D_GLIBCXX_USE_CXX11_ABI=0

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