[Python] Fix ROOT include directory resolution for Python wheels #20915
+15
−1
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As of commit a5b1ed9, ROOT became smarter about finding the include path in the install tree, inferring the correct relative path from $ROOTSYS and the CMAKE_INSTALL_INCLUDEDIR variable at build time. Before, that only happened for
gnuinstall=ON, but now it always happens.However, for the Python wheel, we are breaking the assumptions that ROOT makes by moving around directories in the install tree. Fortunately, we are moving directories around such that in the end, it has same structure as the build tree. Hence, we put the build tree marker in the Python package, so ROOT thinks the relative resource paths from the build tree apply.