FetchContent: Populate directly without a sub-build

Fixes: #21703

12 files changed, 94 insertions, 43 deletions

diff --git a/Tests/RunCMake/FetchContent/CMakeLists.txt b/Tests/RunCMake/FetchContent/CMakeLists.txt
index 3cc2e43..eb0b40c 100644
--- a/Tests/RunCMake/FetchContent/CMakeLists.txt
+++ b/Tests/RunCMake/FetchContent/CMakeLists.txt
@@ -4,4 +4,10 @@ project(${RunCMake_TEST} NONE)
 # Tests assume no previous downloads in the output directory
 file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/_deps)
 
+if(CMP0168 STREQUAL "NEW")
+  cmake_policy(SET CMP0168 NEW)
+  string(REGEX REPLACE "-direct$" "" RunCMake_TEST "${RunCMake_TEST}")
+else()
+  cmake_policy(SET CMP0168 OLD)
+endif()
 include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/FetchContent/DownloadFile.cmake b/Tests/RunCMake/FetchContent/DownloadFile.cmake
index 741b6d3..e21ae28 100644
--- a/Tests/RunCMake/FetchContent/DownloadFile.cmake
+++ b/Tests/RunCMake/FetchContent/DownloadFile.cmake
@@ -1,8 +1,12 @@
 include(FetchContent)
 
+# The file hash depends on the line endings used by git
+file(MD5 ${CMAKE_CURRENT_LIST_DIR}/dummyFile.txt md5_hash)
+
 FetchContent_Declare(
   t1
   URL ${CMAKE_CURRENT_LIST_DIR}/dummyFile.txt
+  URL_HASH MD5=${md5_hash}
   DOWNLOAD_NO_EXTRACT YES
 )
 
diff --git a/Tests/RunCMake/FetchContent/DownloadTwice-direct-result.txt b/Tests/RunCMake/FetchContent/DownloadTwice-direct-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/FetchContent/DownloadTwice-direct-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/FetchContent/DownloadTwice-direct-stderr.txt b/Tests/RunCMake/FetchContent/DownloadTwice-direct-stderr.txt
new file mode 100644
index 0000000..e793902
--- /dev/null
+++ b/Tests/RunCMake/FetchContent/DownloadTwice-direct-stderr.txt
@@ -0,0 +1,2 @@
+CMake Error at .*/Modules/FetchContent\.cmake:[0-9]+ \(message\):
+  Content t1 already populated in
diff --git a/Tests/RunCMake/FetchContent/MakeAvailableUndeclared-direct-result.txt b/Tests/RunCMake/FetchContent/MakeAvailableUndeclared-direct-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/FetchContent/MakeAvailableUndeclared-direct-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/FetchContent/MakeAvailableUndeclared-direct-stderr.txt b/Tests/RunCMake/FetchContent/MakeAvailableUndeclared-direct-stderr.txt
new file mode 100644
index 0000000..9c3fc27
--- /dev/null
+++ b/Tests/RunCMake/FetchContent/MakeAvailableUndeclared-direct-stderr.txt
@@ -0,0 +1,2 @@
+CMake Error at .*/Modules/FetchContent\.cmake:[0-9]+ \(message\):
+  No content details recorded for NoDetails
diff --git a/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing-direct-result.txt b/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing-direct-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing-direct-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing-direct-stderr.txt b/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing-direct-stderr.txt
new file mode 100644
index 0000000..7ecb06b
--- /dev/null
+++ b/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing-direct-stderr.txt
@@ -0,0 +1,2 @@
+ *Manually specified source directory is missing:
++ *FETCHCONTENT_SOURCE_DIR_WITHPROJECT --> .*/ADirThatDoesNotExist
diff --git a/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing.cmake b/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing.cmake
index 0e24c1a..82e5c46 100644
--- a/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing.cmake
+++ b/Tests/RunCMake/FetchContent/ManualSourceDirectoryMissing.cmake
@@ -1,3 +1,4 @@
+message(STATUS "FETCHCONTENT_SOURCE_DIR_WITHPROJECT = ${FETCHCONTENT_SOURCE_DIR_WITHPROJECT}")
 include(FetchContent)
 
 FetchContent_Declare(
diff --git a/Tests/RunCMake/FetchContent/ManualSourceDirectoryRelative-direct-stderr.txt b/Tests/RunCMake/FetchContent/ManualSourceDirectoryRelative-direct-stderr.txt
new file mode 100644
index 0000000..3defcb4
--- /dev/null
+++ b/Tests/RunCMake/FetchContent/ManualSourceDirectoryRelative-direct-stderr.txt
@@ -0,0 +1,3 @@
+ *Relative source directory specified.  This is not safe, as it depends on
+ *the calling directory scope.
++ *FETCHCONTENT_SOURCE_DIR_WITHPROJECT --> WithProject
diff --git a/Tests/RunCMake/FetchContent/RunCMakeTest.cmake b/Tests/RunCMake/FetchContent/RunCMakeTest.cmake
index 0f443a7..72a458c 100644
--- a/Tests/RunCMake/FetchContent/RunCMakeTest.cmake
+++ b/Tests/RunCMake/FetchContent/RunCMakeTest.cmake
@@ -2,81 +2,107 @@ include(RunCMake)
 
 unset(RunCMake_TEST_NO_CLEAN)
 
-run_cmake(MissingDetails)
-run_cmake(DirectIgnoresDetails)
-run_cmake(FirstDetailsWin)
-run_cmake(DownloadTwice)
-run_cmake(DownloadFile)
-run_cmake(IgnoreToolchainFile)
-run_cmake(SameGenerator)
-run_cmake(System)
-run_cmake(VarDefinitions)
-run_cmake(VarPassthroughs)
-run_cmake(GetProperties)
-run_cmake(UsesTerminalOverride)
-run_cmake(MakeAvailable)
-run_cmake(MakeAvailableTwice)
-run_cmake(MakeAvailableUndeclared)
-run_cmake(VerifyHeaderSet)
+function(run_cmake_with_cmp0168 name)
+  run_cmake_with_options("${name}" -D CMP0168=OLD ${ARGN})
+  run_cmake_with_options("${name}-direct" -D CMP0168=NEW ${ARGN})
+endfunction()
+
+# Won't get to the part where CMP0168 matters
+run_cmake_with_options(MissingDetails -D CMP0168=NEW)
+
+# These are testing specific aspects of the sub-build
+run_cmake_with_options(SameGenerator -D CMP0168=OLD)
+run_cmake_with_options(VarPassthroughs -D CMP0168=OLD)
 
-run_cmake_with_options(FindDependencyExport
+run_cmake_with_cmp0168(DirectIgnoresDetails)
+run_cmake_with_cmp0168(FirstDetailsWin)
+run_cmake_with_cmp0168(DownloadTwice)
+run_cmake_with_cmp0168(DownloadFile)
+run_cmake_with_cmp0168(IgnoreToolchainFile)
+run_cmake_with_cmp0168(System)
+run_cmake_with_cmp0168(VarDefinitions)
+run_cmake_with_cmp0168(GetProperties)
+run_cmake_with_cmp0168(UsesTerminalOverride)
+run_cmake_with_cmp0168(MakeAvailable)
+run_cmake_with_cmp0168(MakeAvailableTwice)
+run_cmake_with_cmp0168(MakeAvailableUndeclared)
+run_cmake_with_cmp0168(VerifyHeaderSet)
+
+run_cmake_with_cmp0168(FindDependencyExport
   -D "CMAKE_PROJECT_TOP_LEVEL_INCLUDES=${CMAKE_CURRENT_LIST_DIR}/FindDependencyExportDP.cmake"
 )
 
-run_cmake_with_options(ManualSourceDirectory
+run_cmake_with_cmp0168(ManualSourceDirectory
   -D "FETCHCONTENT_SOURCE_DIR_WITHPROJECT=${CMAKE_CURRENT_LIST_DIR}/WithProject"
 )
-run_cmake_with_options(ManualSourceDirectoryMissing
+run_cmake_with_cmp0168(ManualSourceDirectoryMissing
   -D "FETCHCONTENT_SOURCE_DIR_WITHPROJECT=${CMAKE_CURRENT_LIST_DIR}/ADirThatDoesNotExist"
 )
 # Need to use :STRING to prevent CMake from automatically converting it to an
 # absolute path
-run_cmake_with_options(ManualSourceDirectoryRelative
+run_cmake_with_cmp0168(ManualSourceDirectoryRelative
   -D "FETCHCONTENT_SOURCE_DIR_WITHPROJECT:STRING=WithProject"
 )
 
-function(run_FetchContent_DirOverrides)
-  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/DirOverrides-build)
+function(run_FetchContent_DirOverrides cmp0168)
+  if(cmp0168 STREQUAL "NEW")
+    set(suffix "-direct")
+  else()
+    set(suffix "")
+  endif()
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/DirOverrides${suffix}-build)
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
 
-  run_cmake(DirOverrides)
+  run_cmake_with_options(DirOverrides${suffix} -D CMP0168=${cmp0168})
 
   set(RunCMake_TEST_NO_CLEAN 1)
-  run_cmake_with_options(DirOverridesDisconnected
+  run_cmake_with_options(DirOverridesDisconnected${suffix}
+    -D CMP0168=${cmp0168}
     -D FETCHCONTENT_FULLY_DISCONNECTED=YES
   )
 endfunction()
-run_FetchContent_DirOverrides()
+run_FetchContent_DirOverrides(OLD)
+run_FetchContent_DirOverrides(NEW)
 
 set(RunCMake_TEST_OUTPUT_MERGE 1)
-run_cmake(PreserveEmptyArgs)
+run_cmake_with_cmp0168(PreserveEmptyArgs)
 set(RunCMake_TEST_OUTPUT_MERGE 0)
 
-# We need to pass through CMAKE_GENERATOR and CMAKE_MAKE_PROGRAM
-# to ensure the test can run on machines where the build tool
-# isn't on the PATH. Some build slaves explicitly test with such
-# an arrangement (e.g. to test with spaces in the path). We also
-# pass through the platform and toolset for completeness, even
-# though we don't build anything, just in case this somehow affects
-# the way the build tool is invoked.
-run_cmake_command(ScriptMode
-    ${CMAKE_COMMAND}
-    -DCMAKE_GENERATOR=${RunCMake_GENERATOR}
-    -DCMAKE_GENERATOR_PLATFORM=${RunCMake_GENERATOR_PLATFORM}
-    -DCMAKE_GENERATOR_TOOLSET=${RunCMake_GENERATOR_TOOLSET}
-    -DCMAKE_MAKE_PROGRAM=${RunCMake_MAKE_PROGRAM}
-    -P ${CMAKE_CURRENT_LIST_DIR}/ScriptMode.cmake
-)
-
 function(run_FetchContent_ExcludeFromAll)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/ExcludeFromAll-build)
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
   file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
 
-  run_cmake(ExcludeFromAll)
+  # We're testing FetchContent_MakeAvailable()'s add_subdirectory() behavior,
+  # so it doesn't matter if we use OLD or NEW for CMP0168, but NEW is faster.
+  run_cmake(ExcludeFromAll -D CMP0168=NEW)
 
   set(RunCMake_TEST_NO_CLEAN 1)
   run_cmake_command(ExcludeFromAll-build ${CMAKE_COMMAND} --build .)
 endfunction()
 run_FetchContent_ExcludeFromAll()
+
+# Script mode testing requires more care for CMP0168 set to OLD.
+# We need to pass through CMAKE_GENERATOR and CMAKE_MAKE_PROGRAM
+# to ensure the test can run on machines where the build tool
+# isn't on the PATH. Some build machines explicitly test with such
+# an arrangement (e.g. to test with spaces in the path). We also
+# pass through the platform and toolset for completeness, even
+# though we don't build anything, just in case this somehow affects
+# the way the build tool is invoked.
+run_cmake_command(ScriptMode
+  ${CMAKE_COMMAND}
+  -DCMP0168=OLD
+  -DCMAKE_GENERATOR=${RunCMake_GENERATOR}
+  -DCMAKE_GENERATOR_PLATFORM=${RunCMake_GENERATOR_PLATFORM}
+  -DCMAKE_GENERATOR_TOOLSET=${RunCMake_GENERATOR_TOOLSET}
+  -DCMAKE_MAKE_PROGRAM=${RunCMake_MAKE_PROGRAM}
+  -P ${CMAKE_CURRENT_LIST_DIR}/ScriptMode.cmake
+)
+# CMP0168 NEW doesn't need a build tool or generator, so don't set them.
+run_cmake_command(ScriptMode-direct
+  ${CMAKE_COMMAND}
+  -DCMP0168=NEW
+  -P ${CMAKE_CURRENT_LIST_DIR}/ScriptMode.cmake
+)
diff --git a/Tests/RunCMake/FetchContent/ScriptMode.cmake b/Tests/RunCMake/FetchContent/ScriptMode.cmake
index 0a93d62..bf66140 100644
--- a/Tests/RunCMake/FetchContent/ScriptMode.cmake
+++ b/Tests/RunCMake/FetchContent/ScriptMode.cmake
@@ -1,3 +1,5 @@
+cmake_policy(SET CMP0168 ${CMP0168})
+
 include(FetchContent)
 
 file(WRITE tmpFile.txt "Generated contents, not important")