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[cmake] On a fresh configure, remove possibly outdated pcms. #22751

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[cmake] On a fresh configure, remove possibly outdated pcms. #22751

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7 changes: 7 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -469,6 +469,13 @@ if(MSVC)
endif()

if(runtime_cxxmodules)
if(NOT ROOT_CONFIGURED_FROM_CACHE)
# When using cmake --fresh (or changing the toolchain), remove possibly stale pcms that are not tracked by CMake
set(ROOT_CONFIGURED_FROM_CACHE True CACHE BOOL "Shows if ROOT is configured from an existing CMake cache")
mark_as_advanced(ROOT_CONFIGURED_FROM_CACHE)
file(GLOB left_over_pcms ${CMAKE_BINARY_DIR}/lib/*.pcm)
file(REMOVE ${left_over_pcms})
endif()
# Dummy target that does nothing, we don't need a PCH for modules.
# Onepcm target has all dependencies needed for allDict.cxx.pch, which allow
# to test hsimple.C after all C++ modules are updated.
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