qt5base-lts/cmake/QtFeatureCommon.cmake

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CMake
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function(qt_feature_normalize_name name out_var)
# Normalize the feature name to something CMake can deal with.
if(name MATCHES "c\\+\\+")
string(REGEX REPLACE "[^a-zA-Z0-9_]" "x" name "${name}")
else()
string(REGEX REPLACE "[^a-zA-Z0-9_]" "_" name "${name}")
endif()
set(${out_var} "${name}" PARENT_SCOPE)
endfunction()