How to retrieve a user environment variable in CMake Windows

Question

I know how to retrieve a normal machine wide environment variable in CMAKE using   ENV EnvironmentVariableName    but I can not retrieve a user specific environment variable  Is it possible and how

User · Accepted Answer

Getting variables into your CMake script

You can pass a variable on the line with the cmake invocation:

FOO=1 cmake

or by exporting a variable in BASH:

export FOO=1

Then you can pick it up in a cmake script using:

$ENV{FOO}

User · Answer

You need to have your variables exported  So for example in Linux   export EnvironmentVariableName foo   Unexported variables are empty in CMAKE

User · Answer

You can also invoke cmake itself to do this in a cross-platform way   cmake -E env EnvironmentVariableName  Hello World  cmake         env  --unset NAME      NAME VALUE     COMMAND  ARG          Run command in a modified environment      Just be aware that this may only work the first time  If CMake re-configures with one of the consecutive builds  you just call e g  make  one CMakeLists txt was changed and CMake runs through the generation process again   the user defined environment variable may not be there anymore  in comparison to system wide environment variables    So I transfer those user defined environment variables in my projects into a CMake cached variable   cmake minimum required VERSION 2 6   project PrintEnv NONE   if  NOT   ENV EnvironmentVariableName   STREQUAL         set EnvironmentVariableName   ENV EnvironmentVariableName   CACHE INTERNAL  Copied from environment variable   endif    message  EnvironmentVariableName     EnvironmentVariableName      Reference   CMake - Command Line Tool Mode

User · Answer

Environment variables  that you modify using the System Properties  are only propagated to subshells when you create a new subshell   If you had a command line prompt  DOS or cygwin  open when you changed the User env vars  then they won t show up   You need to open a new command line prompt after you change the user settings   The equivalent in Unix Linux is adding a line to your  bash rc  you need to start a new shell to get the values

[windows] How to retrieve a user environment variable in CMake (Windows)

Getting variables into your CMake script

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