Unable to build ffmpeg extension

I have upgraded our in app version of ExoPlayer to 2.13.3. Now we also want to build the ffmpeg extension to go along with it, however, I get a build error when the build_ffmpeg.sh script launches:

Using 8 jobs for make
~/Library/Android/sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi16-clang is unable to create an executable file.
C compiler test failed.

...

After that it still continues with building, but the output files are missing. Previously, I was able to build the 2.11.3 extension with this same machine.

I have checked, and the referenced file does exist:

Daniels-MacBook-Pro-2:jni dzolnai$ ls -l ~/Library/Android/sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi16-clang
-rwxr-xr-x  1 dzolnai  staff  177 Jun  8  2020 /Users/dzolnai/Library/Android/sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi16-clang

Switching over to the r20 NDK does not help. I also tried versions 21.4.7075529 and 22.1.7171670 without any success. I am building the aac ac3 eac3 decoders. I have checked, the checked out FFMPEG version is 4.2, as instructed.

Do you perhaps have any idea what might be wrong in my case?

[dzolnai]

I have changed TMPDIR to a tmp directory I created inside the ffmpeg root repo. Now the end of my logs look like this:

BEGIN /Users/dzolnai/Documents/Work/ffmpeg/tmp/ffconf.fv1NJEWM/test.c
    1	int main(void){ return 0; }
END /Users/dzolnai/Documents/Work/ffmpeg/tmp/ffconf.fv1NJEWM/test.c
~/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi16-clang -march=armv7-a -mfloat-abi=softfp -march=armv7-a -c -o /Users/dzolnai/Documents/Work/ffmpeg/tmp/ffconf.fv1NJEWM/test.o /Users/dzolnai/Documents/Work/ffmpeg/tmp/ffconf.fv1NJEWM/test.c
./configure: line 974: ~/Library/Android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/darwin-x86_64/bin/armv7a-linux-androideabi16-clang: No such file or directory
C compiler test failed.

I have checked, and the file /Users/dzolnai/Documents/Work/ffmpeg/tmp/ffconf.fv1NJEWM/test.c Does not exist. The tmp directory is completely empty. Maybe the part where it should create the temporary file goes wrong? I’ll try to play a bit around with permissions and file locations, I know that macOS has added some special permissions to accessing special directories like Documents or Desktop.

[kim-vde]

Thanks for sharing the solution! I could indeed reproduce by changing the NDK_PATH to start with a tilde.