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5

nvcc not found, but only when using sudo

rated 0 times [ 5] [ 0] / answers: 1 / hits: 23562 / 2 Years ago, mon, july 25, 2022, 8:40:18

I can't get ANYTHING working on linux. I'm trying to compile CudaMiner. Output of sudo make:

ypt-jane.o `test -f 'scrypt-jane.cpp' || echo './'`scrypt-jane.cpp

mv -f .deps/cudaminer-scrypt-jane.Tpo .deps/cudaminer-scrypt-jane.Po

nvcc -g -O2 -Xptxas "-abi=no -v" -arch=compute_10 --maxrregcount=64 --ptxas-options=-v -I./compat/jansson -o salsa_kernel.o -c salsa_kernel.cu

/bin/bash: nvcc: command not found

make[2]: *** [salsa_kernel.o] Error 127

make[2]: Leaving directory `/var/progs/CudaMiner'

make[1]: *** [all-recursive] Error 1

make[1]: Leaving directory `/var/progs/CudaMiner'

make: *** [all] Error 2

So, kind of interesting. Output of nvcc:

nvcc fatal   : No input files specified; use option --help for more information

Whereas the output of sudo nvcc:

sudo: nvcc: command not found

I have identical exports listed in ~/.bashrc AND /etc/bash.bashrc. (Nvcc is located in: /usr/local/cuda-5.0/bin/nvcc)

I also tried changing the current path, to no avail:

$ sudo bash -c 'echo $PATH'

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

$ PATH=$PATH:/usr/local/cuda-5.0/bin/nvcc

$ sudo bash -c 'echo $PATH'

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

Thanks in advance!

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ofunn

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3 Years ago

answered 2 Years ago breadoules · Accepted Answer

So apparently, nvcc is not on the PATH when you run it with sudo. You can confirm this with:

sudo bash -c 'echo $PATH'

The easiest solution is to call sudo with the absolute path of nvcc:

sudo $(which nvcc)

When running commands without absolute path like nvcc, sudo uses the value of the secure_path configuration in /etc/sudoers as the PATH, for example in my system:

Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

So even if you set PATH in one of the startup files that the shell normally sources, it won't work. If you want to make sudo nvcc work temporarily, just to get your build working, I think you have two options:

Edit the installer script and change the lines with sudo nvcc to sudo /path/to/nvcc

Create a symlink to nvcc in one of the directories listed in secure_path, like this: sudo ln -s /path/to/nvcc /sbin/nvcc

UPDATE

If you have a hard time finding the path of nvcc, you can try these commands, in this order (they get slower and slower), until you find a match:

which nvcc

find /usr/local/cuda-5.0 -name nvcc

find /usr/local/ -name nvcc

find /opt -name nvcc

find / -name nvcc