find_package: Use <PACKAGENAME>_ROOT variables as search prefixes

Extend commit eb35d8884b (find_package: Use PackageName_ROOT variables
as search prefixes, 2018-03-15, v3.12.0-rc1~349^2) to also check
upper-case `<PACKAGENAME>_ROOT` variables.  Add policy `CMP0144` to
enable the behavior in a compatible way.

Fixes: #24403

16 files changed, 466 insertions, 0 deletions

diff --git a/Tests/RunCMake/find_package/CMP0144-NEW-CaseInsensitive-stderr.txt b/Tests/RunCMake/find_package/CMP0144-NEW-CaseInsensitive-stderr.txt
new file mode 100644
index 0000000..3ccd101
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-NEW-CaseInsensitive-stderr.txt
@@ -0,0 +1,45 @@
+^----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/cmake_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/cmake_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/cmake_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/cmake_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/cmake_root/bin/foo.exe
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/cmake_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/cmake_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/cmake_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/cmake_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/cmake_root/bin/foo.exe
+
+----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/env_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/env_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/env_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/env_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/env_root/bin/foo.exe
+
+----------$
diff --git a/Tests/RunCMake/find_package/CMP0144-NEW-CaseInsensitive.cmake b/Tests/RunCMake/find_package/CMP0144-NEW-CaseInsensitive.cmake
new file mode 100644
index 0000000..f0853ee
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-NEW-CaseInsensitive.cmake
@@ -0,0 +1,3 @@
+cmake_policy(VERSION 3.26)
+cmake_policy(SET CMP0144 NEW)
+include(CMP0144-common.cmake)
diff --git a/Tests/RunCMake/find_package/CMP0144-NEW-CaseSensitive-stderr.txt b/Tests/RunCMake/find_package/CMP0144-NEW-CaseSensitive-stderr.txt
new file mode 100644
index 0000000..3ccd101
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-NEW-CaseSensitive-stderr.txt
@@ -0,0 +1,45 @@
+^----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/cmake_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/cmake_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/cmake_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/cmake_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/cmake_root/bin/foo.exe
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/cmake_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/cmake_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/cmake_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/cmake_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/cmake_root/bin/foo.exe
+
+----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/env_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/env_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/env_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/env_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/env_root/bin/foo.exe
+
+----------$
diff --git a/Tests/RunCMake/find_package/CMP0144-NEW-CaseSensitive.cmake b/Tests/RunCMake/find_package/CMP0144-NEW-CaseSensitive.cmake
new file mode 100644
index 0000000..f0853ee
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-NEW-CaseSensitive.cmake
@@ -0,0 +1,3 @@
+cmake_policy(VERSION 3.26)
+cmake_policy(SET CMP0144 NEW)
+include(CMP0144-common.cmake)
diff --git a/Tests/RunCMake/find_package/CMP0144-OLD-CaseInsensitive-stderr.txt b/Tests/RunCMake/find_package/CMP0144-OLD-CaseInsensitive-stderr.txt
new file mode 100644
index 0000000..3274b82
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-OLD-CaseInsensitive-stderr.txt
@@ -0,0 +1,45 @@
+^----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/env_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/env_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/env_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/env_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/env_root/bin/foo.exe
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/env_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/env_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/env_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/env_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/env_root/bin/foo.exe
+
+----------$
diff --git a/Tests/RunCMake/find_package/CMP0144-OLD-CaseInsensitive.cmake b/Tests/RunCMake/find_package/CMP0144-OLD-CaseInsensitive.cmake
new file mode 100644
index 0000000..f1560a9
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-OLD-CaseInsensitive.cmake
@@ -0,0 +1,3 @@
+cmake_policy(VERSION 3.26)
+cmake_policy(SET CMP0144 OLD)
+include(CMP0144-common.cmake)
diff --git a/Tests/RunCMake/find_package/CMP0144-OLD-CaseSensitive-stderr.txt b/Tests/RunCMake/find_package/CMP0144-OLD-CaseSensitive-stderr.txt
new file mode 100644
index 0000000..c02a797
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-OLD-CaseSensitive-stderr.txt
@@ -0,0 +1,45 @@
+^----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------$
diff --git a/Tests/RunCMake/find_package/CMP0144-OLD-CaseSensitive.cmake b/Tests/RunCMake/find_package/CMP0144-OLD-CaseSensitive.cmake
new file mode 100644
index 0000000..f1560a9
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-OLD-CaseSensitive.cmake
@@ -0,0 +1,3 @@
+cmake_policy(VERSION 3.26)
+cmake_policy(SET CMP0144 OLD)
+include(CMP0144-common.cmake)
diff --git a/Tests/RunCMake/find_package/CMP0144-WARN-CaseInsensitive-stderr.txt b/Tests/RunCMake/find_package/CMP0144-WARN-CaseInsensitive-stderr.txt
new file mode 100644
index 0000000..3540dc9
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-WARN-CaseInsensitive-stderr.txt
@@ -0,0 +1,63 @@
+^----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: '<base>/foo/env_root'
++
+CMake Warning \(dev\) at CMP0144-common.cmake:[0-9]+ \(find_package\):
+  Policy CMP0144 is not set: find_package uses upper-case <PACKAGENAME>_ROOT
+  variables.  Run "cmake --help-policy CMP0144" for policy details\.  Use the
+  cmake_policy command to set the policy and suppress this warning\.
+
+  CMake variable FOO_ROOT is set to:
+
+    [^
+]*/Tests/RunCMake/find_package/PackageRoot/foo/cmake_root
+
+  For compatibility, find_package is ignoring the variable, but code in a
+  \.cmake module might still use it\.
+Call Stack \(most recent call first\):
+  CMP0144-common.cmake:[0-9]+ \(RunTestCase\)
+  CMP0144-WARN-CaseInsensitive.cmake:[0-9]+ \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
++
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/env_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/env_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/env_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/env_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/env_root/bin/foo.exe
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/env_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/env_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/env_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/env_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/env_root/bin/foo.exe
+
+----------$
diff --git a/Tests/RunCMake/find_package/CMP0144-WARN-CaseInsensitive.cmake b/Tests/RunCMake/find_package/CMP0144-WARN-CaseInsensitive.cmake
new file mode 100644
index 0000000..10f6b66
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-WARN-CaseInsensitive.cmake
@@ -0,0 +1,3 @@
+cmake_policy(VERSION 3.26)
+# (do not set CMP0144)
+include(CMP0144-common.cmake)
diff --git a/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-Mixed-stderr.txt b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-Mixed-stderr.txt
new file mode 100644
index 0000000..3ccd101
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-Mixed-stderr.txt
@@ -0,0 +1,45 @@
+^----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/cmake_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/cmake_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/cmake_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/cmake_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/cmake_root/bin/foo.exe
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/cmake_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/cmake_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/cmake_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/cmake_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/cmake_root/bin/foo.exe
+
+----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: <base>/foo/env_root/include/foo.h
+FOO_TEST_FILE_ZOT: <base>/foo/env_root/include/zot/zot.h
+FOO_TEST_PATH_FOO: <base>/foo/env_root/include
+FOO_TEST_PATH_ZOT: <base>/foo/env_root/include/zot
+FOO_TEST_PROG_FOO: <base>/foo/env_root/bin/foo.exe
+
+----------$
diff --git a/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-Mixed.cmake b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-Mixed.cmake
new file mode 100644
index 0000000..10f6b66
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-Mixed.cmake
@@ -0,0 +1,3 @@
+cmake_policy(VERSION 3.26)
+# (do not set CMP0144)
+include(CMP0144-common.cmake)
diff --git a/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-stderr.txt b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-stderr.txt
new file mode 100644
index 0000000..b828f05
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive-stderr.txt
@@ -0,0 +1,68 @@
+^----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: '<base>/foo/env_root'
++
+CMake Warning \(dev\) at CMP0144-common.cmake:[0-9]+ \(find_package\):
+  Policy CMP0144 is not set: find_package uses upper-case <PACKAGENAME>_ROOT
+  variables.  Run "cmake --help-policy CMP0144" for policy details\.  Use the
+  cmake_policy command to set the policy and suppress this warning\.
+
+  CMake variable FOO_ROOT is set to:
+
+    [^
+]*/Tests/RunCMake/find_package/PackageRoot/foo/cmake_root
+
+  Environment variable FOO_ROOT is set to:
+
+    [^
+]*/Tests/RunCMake/find_package/PackageRoot/foo/env_root
+
+  For compatibility, find_package is ignoring the variable, but code in a
+  \.cmake module might still use it\.
+Call Stack \(most recent call first\):
+  CMP0144-common.cmake:[0-9]+ \(RunTestCase\)
+  CMP0144-WARN-CaseSensitive.cmake:[0-9]+ \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
++
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : '<base>/foo/cmake_root'
+ENV{FOO_ROOT}: ''
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------
+FOO_ROOT     : ''
+ENV{FOO_ROOT}: '<base>/foo/env_root'
+
+find_package\(Foo\)
+FOO_TEST_FILE_FOO: FOO_TEST_FILE_FOO-NOTFOUND
+FOO_TEST_FILE_ZOT: FOO_TEST_FILE_ZOT-NOTFOUND
+FOO_TEST_PATH_FOO: FOO_TEST_PATH_FOO-NOTFOUND
+FOO_TEST_PATH_ZOT: FOO_TEST_PATH_ZOT-NOTFOUND
+FOO_TEST_PROG_FOO: FOO_TEST_PROG_FOO-NOTFOUND
+
+----------$
diff --git a/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive.cmake b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive.cmake
new file mode 100644
index 0000000..10f6b66
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-WARN-CaseSensitive.cmake
@@ -0,0 +1,3 @@
+cmake_policy(VERSION 3.26)
+# (do not set CMP0144)
+include(CMP0144-common.cmake)
diff --git a/Tests/RunCMake/find_package/CMP0144-common.cmake b/Tests/RunCMake/find_package/CMP0144-common.cmake
new file mode 100644
index 0000000..58eccca
--- /dev/null
+++ b/Tests/RunCMake/find_package/CMP0144-common.cmake
@@ -0,0 +1,78 @@
+# (includer selects CMP0144)
+list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_CURRENT_SOURCE_DIR}/PackageRoot)
+set(PackageRoot_BASE ${CMAKE_CURRENT_SOURCE_DIR}/PackageRoot)
+
+function(PrintPath label path)
+  string(REPLACE "${PackageRoot_BASE}" "<base>" out "${path}")
+  message("${label} ${out}")
+endfunction()
+
+macro(RunTestCase)
+  message("----------")
+  PrintPath("FOO_ROOT     :" "'${FOO_ROOT}'")
+  PrintPath("ENV{FOO_ROOT}:" "'$ENV{FOO_ROOT}'")
+  message("")
+
+  find_package(Foo)
+  message("find_package(Foo)")
+  PrintPath("FOO_TEST_FILE_FOO:" "${FOO_TEST_FILE_FOO}")
+  PrintPath("FOO_TEST_FILE_ZOT:" "${FOO_TEST_FILE_ZOT}")
+  PrintPath("FOO_TEST_PATH_FOO:" "${FOO_TEST_PATH_FOO}")
+  PrintPath("FOO_TEST_PATH_ZOT:" "${FOO_TEST_PATH_ZOT}")
+  PrintPath("FOO_TEST_PROG_FOO:" "${FOO_TEST_PROG_FOO}")
+  message("")
+
+  unset(FOO_ROOT)
+  unset(ENV{FOO_ROOT})
+  if(NOT CMAKE_HOST_WIN32)
+    unset(Foo_ROOT)
+    unset(ENV{Foo_ROOT})
+  endif()
+  unset(FOO_TEST_FILE_FOO)
+  unset(FOO_TEST_FILE_ZOT)
+  unset(FOO_TEST_PATH_FOO)
+  unset(FOO_TEST_PATH_ZOT)
+  unset(FOO_TEST_PROG_FOO)
+  unset(FOO_TEST_FILE_FOO CACHE)
+  unset(FOO_TEST_FILE_ZOT CACHE)
+  unset(FOO_TEST_PATH_FOO CACHE)
+  unset(FOO_TEST_PATH_ZOT CACHE)
+  unset(FOO_TEST_PROG_FOO CACHE)
+endmacro()
+
+RunTestCase()
+
+set(FOO_ROOT      ${PackageRoot_BASE}/foo/cmake_root)
+set(ENV{FOO_ROOT} ${PackageRoot_BASE}/foo/env_root)
+if(RunCMake_TEST MATCHES "CaseSensitive")
+  if(RunCMake_TEST STREQUAL "CMP0144-WARN-CaseSensitive-Mixed")
+    set(Foo_ROOT      "${FOO_ROOT}")
+    set(ENV{Foo_ROOT} "$ENV{FOO_ROOT}")
+  else()
+    set(Foo_ROOT      ${PackageRoot_BASE}/does_not_exist)
+    set(ENV{Foo_ROOT} ${PackageRoot_BASE}/does_not_exist)
+  endif()
+endif()
+RunTestCase()
+
+set(FOO_ROOT      ${PackageRoot_BASE}/foo/cmake_root)
+if(RunCMake_TEST MATCHES "CaseSensitive")
+  if(RunCMake_TEST STREQUAL "CMP0144-WARN-CaseSensitive-Mixed")
+    set(Foo_ROOT      "${FOO_ROOT}")
+  else()
+    set(Foo_ROOT      ${PackageRoot_BASE}/does_not_exist)
+  endif()
+endif()
+RunTestCase()
+
+set(ENV{FOO_ROOT} ${PackageRoot_BASE}/foo/env_root)
+if(RunCMake_TEST MATCHES "CaseSensitive")
+  if(RunCMake_TEST STREQUAL "CMP0144-WARN-CaseSensitive-Mixed")
+    set(ENV{Foo_ROOT} "$ENV{FOO_ROOT}")
+  else()
+    set(ENV{Foo_ROOT} ${PackageRoot_BASE}/does_not_exist)
+  endif()
+endif()
+RunTestCase()
+
+message("----------")
diff --git a/Tests/RunCMake/find_package/RunCMakeTest.cmake b/Tests/RunCMake/find_package/RunCMakeTest.cmake
index fa41fc1..e7e3a0b 100644
--- a/Tests/RunCMake/find_package/RunCMakeTest.cmake
+++ b/Tests/RunCMake/find_package/RunCMakeTest.cmake
@@ -55,6 +55,17 @@ run_cmake(REGISTRY_VIEW-no-view)
 run_cmake(REGISTRY_VIEW-wrong-view)
 run_cmake(REGISTRY_VIEW-propagated)
 
+if(CMAKE_HOST_WIN32)
+  run_cmake(CMP0144-WARN-CaseInsensitive)
+  run_cmake(CMP0144-OLD-CaseInsensitive)
+  run_cmake(CMP0144-NEW-CaseInsensitive)
+else()
+  run_cmake(CMP0144-WARN-CaseSensitive)
+  run_cmake(CMP0144-WARN-CaseSensitive-Mixed)
+  run_cmake(CMP0144-OLD-CaseSensitive)
+  run_cmake(CMP0144-NEW-CaseSensitive)
+endif()
+
 file(
     GLOB SearchPaths_TEST_CASE_LIST
     LIST_DIRECTORIES TRUE