Set new CMake policy for upper-case <NAME>_ROOT variables #1642
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In CMake 3.27 and above the find_package(<PackageName>) command now searches prefixes specified by the upper-case <PACKAGENAME>_ROOT CMake variable and the <PACKAGENAME>_ROOT environment variable in addition to the case-preserved <PackageName>_ROOT and <PackageName>_ROOT variables used since policy CMP0074. This policy provides compatibility with projects that have not been updated to avoid using <PACKAGENAME>_ROOT variables for other purposes. The OLD behavior for this policy is to ignore <PACKAGENAME>_ROOT variables if the original <PackageName> has lower-case characters. The NEW behavior for this policy is to use <PACKAGENAME>_ROOT variables.
kupsch
approved these changes
Dec 5, 2023
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In CMake 3.27 and above the find_package() command now searches prefixes specified by the upper-case _ROOT CMake variable and the _ROOT environment variable in addition to the case-preserved _ROOT and _ROOT variables used since policy CMP0074. This policy provides compatibility with projects that have not been updated to avoid using _ROOT variables for other purposes.
The OLD behavior for this policy is to ignore _ROOT variables if the original has lower-case characters. The NEW behavior for this policy is to use _ROOT variables.