FindPython doesn't create Python2::Python target when configuring during build (Windows, 3.14 rc2) (#18990) · Issues · CMake / CMake

FindPython doesn't create Python2::Python target when configuring during build (Windows, 3.14 rc2)

First encountered at my colleague's PC at work, then reproduced by myself at home. MWE:

cmake_minimum_required(VERSION 3.12)
project(xxx)

find_package(Python2 COMPONENTS Development REQUIRED)
if(NOT TARGET Python2::Python)
    message(FATAL_ERROR "NOT FOUND")
endif()
add_library(x x.cpp)

If I change CMakeLists and do a simple configure via cmake . - everything is OK. However, if I change it and do cmake --build . instead -- there will be no target Python2::Python. Other find-modules seem to work just fine.

Happens to me only with 3.14 rc2 on Windows -- on ArchLinux I couldn't reproduce it neither with pre-built binaries from the website, nor with cmake-git AUR package. Downgrading to 3.13.4 on Windows fixes the problem.

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