What does the `-H.` option means for CMake?
cmake
Solution
As mentioned in the linked answer, it is an undocumented option, but looking at the source code reveals its effect:
In `cmake::SetArgs()`:
if(arg.find("-H",0) == 0)
{
directoriesSet = true;
std::string path = arg.substr(2);
path = cmSystemTools::CollapseFullPath(path);
cmSystemTools::ConvertToUnixSlashes(path);
this->SetHomeDirectory(path);
The last call, `SetHomeDirectory` actually sets the source directory for the project. The `-B` option (also undocumented) in turn sets the binary directory.
If these options are not set, the binary directory will be the current folder where cmake is executed, and the source directory can be given as a positional argument (if not found, the source folder will also be the current working directory).
Problem
This answer to a former question on CMake shows this command line: ``` cmake -H. -Bbuild -G "MSYS Makefiles" ``` What task does the `-H.` option perform here? `cmake --help` says that `-H` prints the help... I am using CMake 3.2.3.