sys/sysctl.h has been deprecated

[DDoSolitary]

Hello, I'm trying to build this project on Arch Linux and got the following warnings:

In file included from /home/builder/src/powershell/src/powershell-native/src/libpsl-native/src/getppid.cpp:11:
/usr/include/sys/sysctl.h:21:2: warning: #warning "The <sys/sysctl.h> header is deprecated and will be removed." [-Wcpp]
   21 | #warning "The <sys/sysctl.h> header is deprecated and will be removed."
      |  ^~~~~~~
[ 24%] Building CXX object src/CMakeFiles/psl-native.dir/geterrorcategory.cpp.o
[ 26%] Building CXX object src/CMakeFiles/psl-native.dir/getinodedata.cpp.o
In file included from /home/builder/src/powershell/src/powershell-native/src/libpsl-native/src/getuserfrompid.cpp:15:
/usr/include/sys/sysctl.h:21:2: warning: #warning "The <sys/sysctl.h> header is deprecated and will be removed." [-Wcpp]
   21 | #warning "The <sys/sysctl.h> header is deprecated and will be removed."
      |  ^~~~~~~

This forces me to remove the -Werror flag in CMakeLists.txt to be able to build and will be completely broken when glibc removes the header as stated in the warning.

[DDoSolitary]

FWIW, the SYSCTL syscall will be removed in Linux 5.5.

[simonracz]

Related fix dotnet/coreclr#27048

[iSazonov]

@SteveL-MSFT @adityapatwardhan The fix for Linux looks like cosmetic (we do not use sysctl on Linux). Can we unblock Arch Linux before 7.0 GA?

[regulator-g]

Hi guys any update here? I am having the same issue trying to install Powershell on Arch