Ninja equivalent of Make's “build from this directory down” feature (with CMake)?

Question

When building a project using CMake and Make, you can execute make from a subdirectory of your build tree (i.e. from a directory below whatever directory contains y

Answer 1

This worked for me:

cd 
DIRECTORY=
ninja -t targets all | egrep "^${DIRECTORY}/" | egrep CXX_EXECUTABLE_LINKER | \
    sed -e 's/:.*//g' | xargs ninja

ninja -t targets all - lists all targets (including target type)

egrep "^${DIRECTORY}/" - filters list of targets to only include those in desired directory

egrep CXX_EXECUTABLE_LINKER - limits the targets to just C++ executables. You can remove or tweak this to get the set of targets you're interested in.

sed -e 's/:.*//g' - removes the target type e.g. ": CXX_EXECUTABLE_LINKER"

xargs ninja - invokes ninja to build the targets