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Mickaël Germain
7192a2b798
cmake_path(IS_PREFIX) and $<PATH:IS_PREFIX> treated an empty path as a prefix of every path, including another empty path, following std::filesystem::path. A prefix that is empty because a variable was set to an empty value, or because a generator expression argument expanded to nothing, therefore satisfied a check meant to reject it. Return false for an empty prefix, in cmCMakePath::IsPrefix so that every caller shares one implementation and both the plain and NORMALIZE forms are covered. Normalizing an empty path leaves it empty, so no separate handling of NORMALIZE is needed. Unlike the component comparison, which follows std::filesystem::path deliberately, IsPrefix has no counterpart in the standard: it borrows path iteration but the predicate itself is defined by CMake, so an empty prefix is a gap to fill rather than a standard answer to override. Add policy CMP0223 and restore the old result behind it at the two released surfaces. The other callers of IsPrefix, source_group() and the Makefile generator's source classification, take the new behavior ungated: source_group() rejects an empty TREE argument before reaching it, and the generator passes the source and binary directories. The if(PATH_IS_PREFIX) operator, new in this same release, follows the policy too rather than simply taking the new behavior, so that it agrees with cmake_path(IS_PREFIX) in every policy state and the parity assertions in its test hold unconditionally. Fixes: #28077
9 lines
446 B
Plaintext
9 lines
446 B
Plaintext
CMake Warning \(policy\) at CMP0223-WARN\.cmake:[0-9]+ \(cmake_path\):
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Policy CMP0223 is not set: An empty path is not a prefix of any path\. Run
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"cmake --help-policy CMP0223" for policy details\. Use the cmake_policy
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command to set the policy and suppress this warning\.
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Call Stack \(most recent call first\):
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CMakeLists\.txt:[0-9]+ \(include\)
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This warning is for project developers\. Use -Wno-author or -Wno-policy to
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suppress it\.
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