Problem compiling for Android from Windows

mipr

Hi,

I try to deploy my Windows Qt app on Android but I have problems that my colleagues don't have.

First issue : we have custom plugins, we build them to have .so files and the compiler copy them inside a folder with other plugin/library files. On my PC, the .so files of my custom plugins are not copied to the dedicated folder during compilation, whereas on my colleagues' PCs this step works. I didn't see any differences between their project and mine.
When I manually copy custom plugin files in the folder during compilation the APK works and doesn't crash.

Second issue : after seeing and don't understanding the first issue, I tried to update my Qt Creator (version 6.x.x to 7.0.2) and it's worst. Now, I have errors like :

error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_32; recompile with -fPIC
...
error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_32 in readonly segment; recompile object files with -fPIC or pass '-WI, -z, notext' to allow text relocations in the output

The complete list of errors :

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_32; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:491 (./libavutil/aarch64\asm.S:491)
>>>               fft_neon.o:(fft32_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_32 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:491 (./libavutil/aarch64\asm.S:491)
>>>               fft_neon.o:(fft32_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_64; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:492 (./libavutil/aarch64\asm.S:492)
>>>               fft_neon.o:(fft64_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_64 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:492 (./libavutil/aarch64\asm.S:492)
>>>               fft_neon.o:(fft64_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_128; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:493 (./libavutil/aarch64\asm.S:493)
>>>               fft_neon.o:(fft128_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_128 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:493 (./libavutil/aarch64\asm.S:493)
>>>               fft_neon.o:(fft128_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_256; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:494 (./libavutil/aarch64\asm.S:494)
>>>               fft_neon.o:(fft256_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_256 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:494 (./libavutil/aarch64\asm.S:494)
>>>               fft_neon.o:(fft256_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_512; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:495 (./libavutil/aarch64\asm.S:495)
>>>               fft_neon.o:(fft512_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_512 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:495 (./libavutil/aarch64\asm.S:495)
>>>               fft_neon.o:(fft512_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_1024; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:496 (./libavutil/aarch64\asm.S:496)
>>>               fft_neon.o:(fft1024_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_1024 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:496 (./libavutil/aarch64\asm.S:496)
>>>               fft_neon.o:(fft1024_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_2048; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:497 (./libavutil/aarch64\asm.S:497)
>>>               fft_neon.o:(fft2048_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_2048 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:497 (./libavutil/aarch64\asm.S:497)
>>>               fft_neon.o:(fft2048_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_4096; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:498 (./libavutil/aarch64\asm.S:498)
>>>               fft_neon.o:(fft4096_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_4096 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:498 (./libavutil/aarch64\asm.S:498)
>>>               fft_neon.o:(fft4096_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_8192; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:499 (./libavutil/aarch64\asm.S:499)
>>>               fft_neon.o:(fft8192_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_8192 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:499 (./libavutil/aarch64\asm.S:499)
>>>               fft_neon.o:(fft8192_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: relocation R_AARCH64_ADR_PREL_PG_HI21 cannot be used against symbol ff_cos_16384; recompile with -fPIC
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:500 (./libavutil/aarch64\asm.S:500)
>>>               fft_neon.o:(fft16384_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: can't create dynamic relocation R_AARCH64_ADD_ABS_LO12_NC against symbol: ff_cos_16384 in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a(fft_float.o)
>>> referenced by asm.S:500 (./libavutil/aarch64\asm.S:500)
>>>               fft_neon.o:(fft16384_neon) in archive D:\gstreamer\gstreamer-1.0-android-universal-1.20.1\arm64/lib\libavcodec.a

ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)

I tried to put -fPIC argument inside each steps of my android build steps but the argument is never known, I don't know where to put it.

My build steps are :

qmake: qmake.exe App.pro
Make: make.exe -j12 in D:\Qt_Projects\App
Make install: Copy App Files to D:\Qt_Projects\App\android-build
Build Android APK

Qt Creator version : 7.0.2, Qt version : 5.15.9, OS : Windows 10.

Do you have an idea ?

Update :
The second issue appears when I try to build a plugin. In the generated Makefile of this subproject, it is possible to see the -fPIC argument :

CFLAGS        = -target aarch64-linux-android21 -fno-limit-debug-info -fPIC -fstack-protector-strong -DANDROID -g -fPIC -Wall -W -D_REENTRANT $(DEFINES)
CXXFLAGS      = -target aarch64-linux-android21 -fno-limit-debug-info -fPIC -fstack-protector-strong -DANDROID -pthread -g -fPIC -std=gnu++2a -D_REENTRANT $(DEFINES)

julianoes

@mipr I ran into exactly the same problem. Did you ever find a solution?

JoeCFD

This post is deleted!

julianoes

@JoeCFD I don't think qtcreator vs. qmake should make a difference. Plus, it eventually needs to work in CI anyway.

I assume it has to do with the gstreamer libraries that I'm trying to link to.

JoeCFD

@julianoes OK. I guess Version 6 and 7 of qtcreator are too old. Try to use higher versions. Are you linking gstreamer to your plugin or your app?
If you have to put your own plugin into a specific dir, I do not think it is a problem since your app looks for your plugin in that dir. If you put it somewhere else, your app will not work.

julianoes

@JoeCFD have you read what I wrote? I'm using Qt6 and qmake that comes with it. Nothing about qtcreator.

Kim Nancy

Hi! Ensure project settings match your colleagues' for custom plugin copying. Check the plugin's Makefile for the -fPIC argument to address errors after updating Qt Creator. Maintain compatibility between Qt versions and plugin requirements. Seek assistance on Qt community forums for further support.

julianoes

@Kim-Nancy said in Problem compiling for Android from Windows:

Seek assistance on Qt community forums for further support.

Ha, that's literally where we are.

In any case, this solved it for me: https://stackoverflow.com/a/68394638/8548472.