compilation error in android-ndk-r19c

[Miteshmakwana73]

I am getting this error while running the android studio project, gradle is working okay

ui_openssl.c:(.text+0x68): undefined reference to `stdin'
ui_openssl.c:(.text+0x6c): undefined reference to `stdin'
ui_openssl.c:(.text+0x9c): undefined reference to `stderr'
ui_openssl.c:(.text+0xa0): undefined reference to `stderr'
/home/jenya1/Downloads/baresip-studio-master/app/src/main/cpp/../../../../distribution/openssl/lib/arm64-v8a/libcrypto.a(libcrypto-lib-ui_openssl.o): In function `close_console':
ui_openssl.c:(.text+0x374): undefined reference to `stdin'
ui_openssl.c:(.text+0x378): undefined reference to `stdin'
ui_openssl.c:(.text+0x3a0): undefined reference to `stderr'
ui_openssl.c:(.text+0x3a4): undefined reference to `stderr'

full Log error
error.txt

[enh]

stdin/stdout/stderr weren't added as variables until API 23. fread_unlocked/fwrite_unlocked until 28.

you're building this code for API 21 (--target=aarch64-none-linux-android21), but it looks like you've built libcrypto.a and libbaresip.a for a later API level.

[Miteshmakwana73]

after updating minsdk 23 it worked

but getting a new error
new error.txt

[enh]

nope, that's the error i mentioned in the second sentence of my original reply. that library was built with target API 28, like i said.

[Miteshmakwana73]

this is my make file

# -------------------- VALUES TO CONFIGURE --------------------

# Path to your Android NDK (must be r19 or higher)
NDK_PATH  :=  /usr/local/android-ndk-r19

# Android API level
API_LEVEL := 28

# Set default from following values: [armeabi-v7a, arm64-v8a]
ANDROID_TARGET_ARCH := armeabi-v7a

# Directory where libraries and include files are instelled
OUTPUT_DIR := /usr/src/baresip-studio/distribution

so I have to set API_LEVEL=23 ?

[enh]

if you want to run on API level 23, yes, you need to build for API level 23. otherwise the compiler thinks it can use things that weren't available until 24/25/26/27/28, and your code won't run on 23 or earlier.

[ericQiang]

this is my make file

# -------------------- VALUES TO CONFIGURE --------------------

# Path to your Android NDK (must be r19 or higher)
NDK_PATH  :=  /usr/local/android-ndk-r19

# Android API level
API_LEVEL := 28

# Set default from following values: [armeabi-v7a, arm64-v8a]
ANDROID_TARGET_ARCH := armeabi-v7a

# Directory where libraries and include files are instelled
OUTPUT_DIR := /usr/src/baresip-studio/distribution

so I have to set API_LEVEL=23 ?

@Miteshmakwana73
Hi, have you resolved ?
now ,i get the error

jni/../../../src/util_ini.cpp:208: error: undefined reference to 'fread_unlocked'
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libmtn_test.so] Error 1

I want compile a apk that run in a embedded device which have android8.1.
i known that android8.1 corresponding to the api level 27.

like @enh said. the function fread_unlocked supported by api 28 or later.
that means i can only compile with sdk-27(because the android 8.1 just support api level 27), but the sdk 27 cannot support 'fread_unlocked'.

what should i do?

ps. i develop with qt for android. and android-ndk-r19c.

i choose android-27 android-28 and android-29， all throw the same error

jni/../../../src/util_ini.cpp:208: error: undefined reference to 'fread_unlocked'

best regards.

[DanAlbert]

What are you using to build? Can you share your build.gradle/cmakelists.txt/android.mk? If you're targeting 28+ and have that problem then something has gone wrong, but we don't have enough information to even guess what it would be.

[ericQiang]

@DanAlbert
Thanks for your reply.

My environment is: Qt13.0 + jdk1.8.0_181 + android-sdk(27,28,29) + android-ndk-r19c. suck as the following picture show.

the following files come from my test project. can you point out what's my fault?
thanks.
the following files with a .txt suffix for uploading.
gradle-wrapper.properties.txt
gradlew.bat.txt
gradlew.txt
AndroidManifest.xml.txt
build.gradle.txt
mtn_test.pro.txt
Makefile.txt

[ericQiang]

oh, @DanAlbert I found the reason.
in the makefile

LFLAGS = --sysroot=C:\Android\android-ndk-r19c/platforms/android-21/...

I changed the platform in the gui interface of QT. but that not take effect. I changed the android-21 to android-28 manually, and it worked.

But unfortunately, the apk cannot run on my device. because my device is android 8.1(api level27).

So, if or not i compile a standalone "fread_unlocked" and linked into my project?
or how should we do when we use "fread_unlocked" in project with api level older 28,?

Thanks

[enh]

if you just replace fread_unlocked with fread, you'll have code that works on older devices. it'll be slightly slower because it'll do the extra locking, but that's unavoidable on older devices.

[ericQiang]

if you just replace fread_unlocked with fread, you'll have code that works on older devices. it'll be slightly slower because it'll do the extra locking, but that's unavoidable on older devices.

@enh
Thanks for your reply.
now it seems that i have to use your method.

regards

[linuxaged]

stdin/stdout/stderr weren't added as variables until API 23. fread_unlocked/fwrite_unlocked until 28.

why ndk try to link fread_unlocked/fwrite_unlocked when i use std::fwrite?

[enh-google]

why ndk try to link fread_unlocked/fwrite_unlocked when i use std::fwrite?

it doesn't. you're using fread_unlocked/fwrite_unlocked somewhere. you can find out where by using objdump on your .o/.so files.

[amir28]

I had this issue in compiling linux kernel for android 10(api 29).

drivers/built-in.o: In function `_save_testing_data':
/mnt/Android/Phone/oneplus-nord-n10/bd/downloads/sdm630-kernel/drivers/input/touchscreen/gt1x/test_function.c:1065: undefined reference to `fwrite_unlocked'
/mnt/Android/Phone/oneplus-nord-n10/bd/downloads/sdm630-kernel/drivers/input/touchscreen/gt1x/test_function.c:1087: undefined reference to `fwrite_unlocked'
/mnt/Android/Phone/oneplus-nord-n10/bd/downloads/sdm630-kernel/drivers/input/touchscreen/gt1x/test_function.c:939: undefined reference to `fwrite_unlocked'
/mnt/Android/Phone/oneplus-nord-n10/bd/downloads/sdm630-kernel/drivers/input/touchscreen/gt1x/test_function.c:953: undefined reference to `fwrite_unlocked'
/mnt/Android/Phone/oneplus-nord-n10/bd/downloads/sdm630-kernel/drivers/input/touchscreen/gt1x/test_function.c:1104: undefined reference to `fwrite_unlocked'
drivers/built-in.o:/mnt/Android/kernel/drivers/input/touchscreen/gt1x/test_function.c:1112: more undefined references to `fwrite_unlocked' follow
make[1]: *** [/mnt/Android/linuxkernel/Makefile:1001: vmlinux] Error 1

adding this in Makefile solved it.

subdir-ccflags-y += \
        -fno-builtin-fwrite \
        -Wno-sizeof-pointer-div

[enh-google]

@amir28 --- can you file a new bug for that? i think that's an unrelated issue that i'm not sure we've checked (if clang is automatically "optimizing" fwrite() to fwrite_unlocked() without paying attention to API level).

[rprichard]

They're compiling a kernel, so AFAIK there shouldn't be an Android API level. sdm630 has been around a while -- is @amir28 using gcc or clang to build it?

I think the existence of fflush(nullptr) would make an fwrite -> fwrite_unlocked optimization impractical in general.

I'd guess that a header is defining fwrite to fwrite_unlocked, but then I don't know why -fno-builtin-fwrite would fix it.

[DanAlbert]

The bug originally reported here was user error. If you think you've found a bug, please file a new one (we need the information asked for in the template). Locking to encourage that.