cmake error, Python 3.7 wasn't found

[YaoJiawei329]

Hi, all. I want to run this repo, but error occurs. The first time I run $cmake ../ in /jetson-inference/build, it turned out ...... -- detecting Python 3.7... -- Python 3.7 wasn't found ......

Then, I delete 3.7 in /jetson-inference/python/CMakeLists.txt, line 8 set(PYTHON_BINDING_VERSIONS 2.7 3.6 3.7 ) -------> set(PYTHON_BINDING_VERSIONS 2.7 3.6).

Then, delete /jetson-inference/build, and $mkdir build, $cd build, $cmake../ still has the same error: ...... -- detecting Python 3.7... -- Python 3.7 wasn't found ......

Then I see this https://github.com/dusty-nv/jetson-inference/issues/899, so I install Python3.7, $sudo apt-get install libpython3.7-dev , then rerun $cmake ../ , still cannot find Python3.7, so I think maybe it is not about Python3.7. I check CMakeError.log, but I cannot figure out where is the problem. Here is the CMakeError.log:

Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output: Change Dir: /home/nvidia/jetson-inference/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_588eb/fast && /usr/bin/make -f CMakeFiles/cmTC_588eb.dir/build.make CMakeFiles/cmTC_588eb.dir/build make[1]: Entering directory '/home/nvidia/jetson-inference/build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_588eb.dir/src.c.o /usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD -fPIC -o CMakeFiles/cmTC_588eb.dir/src.c.o -c /home/nvidia/jetson-inference/build/CMakeFiles/CMakeTmp/src.c Linking C executable cmTC_588eb /home/nvidia/cmake-3.20.4-linux-aarch64/bin/cmake -E cmake_link_script CMakeFiles/cmTC_588eb.dir/link.txt --verbose=1 /usr/bin/cc -fPIC -rdynamic CMakeFiles/cmTC_588eb.dir/src.c.o -o cmTC_588eb CMakeFiles/cmTC_588eb.dir/src.c.o: In function main': src.c:(.text+0x48): undefined reference to pthread_create' src.c:(.text+0x50): undefined reference to pthread_detach' src.c:(.text+0x58): undefined reference to pthread_cancel' src.c:(.text+0x64): undefined reference to pthread_join' src.c:(.text+0x74): undefined reference to pthread_atfork' collect2: error: ld returned 1 exit status CMakeFiles/cmTC_588eb.dir/build.make:98: recipe for target 'cmTC_588eb' failed make[1]: *** [cmTC_588eb] Error 1 make[1]: Leaving directory '/home/nvidia/jetson-inference/build/CMakeFiles/CMakeTmp' Makefile:127: recipe for target 'cmTC_588eb/fast' failed make: *** [cmTC_588eb/fast] Error 2

Source file was: #include <pthread.h>

static void* test_func(void* data) { return data; }

int main(void) { pthread_t thread; pthread_create(&thread, NULL, test_func, NULL); pthread_detach(thread); pthread_cancel(thread); pthread_join(thread, NULL); pthread_atfork(NULL, NULL, NULL); pthread_exit(NULL);

return 0; }

Determining if the function pthread_create exists in the pthreads failed with the following output: Change Dir: /home/nvidia/jetson-inference/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_b82ea/fast && /usr/bin/make -f CMakeFiles/cmTC_b82ea.dir/build.make CMakeFiles/cmTC_b82ea.dir/build make[1]: Entering directory '/home/nvidia/jetson-inference/build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_b82ea.dir/CheckFunctionExists.c.o /usr/bin/cc -fPIC -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_b82ea.dir/CheckFunctionExists.c.o -c /home/nvidia/cmake-3.20.4-linux-aarch64/share/cmake-3.20/Modules/CheckFunctionExists.c Linking C executable cmTC_b82ea /home/nvidia/cmake-3.20.4-linux-aarch64/bin/cmake -E cmake_link_script CMakeFiles/cmTC_b82ea.dir/link.txt --verbose=1 /usr/bin/cc -fPIC -DCHECK_FUNCTION_EXISTS=pthread_create -rdynamic CMakeFiles/cmTC_b82ea.dir/CheckFunctionExists.c.o -o cmTC_b82ea -lpthreads /usr/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status CMakeFiles/cmTC_b82ea.dir/build.make:98: recipe for target 'cmTC_b82ea' failed make[1]: *** [cmTC_b82ea] Error 1 make[1]: Leaving directory '/home/nvidia/jetson-inference/build/CMakeFiles/CMakeTmp' Makefile:127: recipe for target 'cmTC_b82ea/fast' failed make: *** [cmTC_b82ea/fast] Error 2

Is there anyone could help me, appreciate it if you leave me some instruction or guide.

ps:I have two Xaviers, succeed on Xavier I, failed on Xavier II. This is very weird that Xavier I and II both are jetpack 4.5 flashed by the same PC(Ubuntu 18.04) sdkmanager.

[YaoJiawei329]

Emm, I found where is wrong. Nothing to do with Python3.7! When I use git clone to clone the repo, ../tools/camera-capture is empty, and I use $git submodule update --init, didn't work. Maybe in the EAST of the earth, Internet is not friendly with GITHUB.

[HGGshiwo]

I have the same problem,

/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status

And tried sudo apt-get install libpthread-stubs0-dev, but it didn't work. Could you tell me the solution? Much apprecaite.

---

I got it: git clone camera-capture manully, and the problem will be fixed.

[yyjqr]

I alse see this problem "python3.7 not found" when update the code.But the real error is container submodule files is not complete,some files can't find. SO NEED TO “git submodule update --init” in container directory!