I'm using CLion IDE, Cmake and trying to write Hello world using CERN ROOT library.
CMakeLists.txt:
message(STATUS $ENV{ROOTSYS})
~/.bashrc:
export ROOTSYS="$HOME/tools/root-build/"
During build in CLion $ENV{ROOTSYS} is empty by some reason. But $ENV{PATH} returns correct $PATH.
What I did wrong?
Variables from .bashrc aren't passed.
Go to File -> Settings -> Build,Execution,Deployment
Click Pass system and...
If you want to read environment variable in C++ runtime e.g. using std::getenv then it won't work as we added environment variable for CMAKE not for runtime.
You can add such variable:
And then in your code:
std::filesystem::path getRootConfigPath()
{
// std::getenv can return nullptr and this is why we CAN'T assign it directly to std::string
const char* path = std::getenv("TEST_CONFIG_DIR");
gcpp::exception::fail_if_true(
path == nullptr, WHERE_IN_FILE, "No such environment variable: ${TEST_CONFIG_DIR}");
gcpp::exception::fail_if_true(std::string_view{path}.empty(),
WHERE_IN_FILE,
"Missing ${TEST_CONFIG_DIR} environment variable");
const std::filesystem::path testConfigDir{path};
gcpp::exception::fail_if_false(std::filesystem::exists(testConfigDir) &&
std::filesystem::is_directory(testConfigDir),
WHERE_IN_FILE,
"Invalid ${TEST_CONFIG_DIR} dir:" + testConfigDir.string());
return testConfigDir;
}
Source of gcpp::exception::fail_if_true
Other way to do this in more friendly way when running unit tests is add this variable to template.
So whenever you click:
Such variable will be there already.
From CLion developers FAQ:
Q: How to pass environment variables and parameters to CMake in CLion?
A: The best way is to use Preferences/Settings | Build, Execution, Deployment | CMake dialog.
As for .bashrc file, it is only used by bash. CLion doesn't need to use bash for run configuration process.
On Ubuntu 17.04, you can set a permanent environment variable by modifying
/etc/enviornment
[I assume you can do this in other versions of Linux, but I provide the version of the system that I am using.]
For example, I am compiling test cases that assume that ${GOOGLE_MOCK} has been set. I added the following to my /etc/environment file, and now I don't have to rewrite all of my CMakeLists.txt files:
GOOGLE_MOCK=/usr/local/src/googletest/googlemock
GOOGLE_TEST_HOME=/usr/local/src/googletest/googletest
Clion just became much more useable.
One thing you can check is the .gdbinit. Clion on Linux will invoke the gdb, which will read in the .gdbinit. I happen to have set environment LD_LIBRARY_PATH xxx in my .gdbinit file, which will override whatever you set LD_LIBRARY_PATH from shell, whether through direct export or through .bashrc, or from CLion environment variable panel.
Hope this helps.
