ExternalProject: Improve error when SOURCE_DIR is missing (#15560)

Mention the SOURCE_DIR that we checked and found empty or missing
so that the user can see the full path to what we expected to find.

10 files changed, 69 insertions, 0 deletions

diff --git a/Tests/RunCMake/ExternalProject/NoOptions-result.txt b/Tests/RunCMake/ExternalProject/NoOptions-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/NoOptions-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/ExternalProject/NoOptions-stderr.txt b/Tests/RunCMake/ExternalProject/NoOptions-stderr.txt
new file mode 100644
index 0000000..12a76c5
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/NoOptions-stderr.txt
@@ -0,0 +1,18 @@
+^CMake Error at .*/Modules/ExternalProject.cmake:[0-9]+ \(message\):
+  No download info given for 'MyProj' and its source directory:
+
+   .*/Tests/RunCMake/ExternalProject/NoOptions-build/MyProj-prefix/src/MyProj
+
+  is not an existing non-empty directory.  Please specify one of:
+
+   \* SOURCE_DIR with an existing non-empty directory
+   \* URL
+   \* GIT_REPOSITORY
+   \* HG_REPOSITORY
+   \* CVS_REPOSITORY and CVS_MODULE
+   \* SVN_REVISION
+   \* DOWNLOAD_COMMAND
+Call Stack \(most recent call first\):
+  .*/Modules/ExternalProject.cmake:[0-9]+ \(_ep_add_download_command\)
+  NoOptions.cmake:[0-9]+ \(ExternalProject_Add\)
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/ExternalProject/NoOptions.cmake b/Tests/RunCMake/ExternalProject/NoOptions.cmake
new file mode 100644
index 0000000..7613c15
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/NoOptions.cmake
@@ -0,0 +1,2 @@
+include(ExternalProject)
+ExternalProject_Add(MyProj)
diff --git a/Tests/RunCMake/ExternalProject/RunCMakeTest.cmake b/Tests/RunCMake/ExternalProject/RunCMakeTest.cmake
index a82ffc9..e038409 100644
--- a/Tests/RunCMake/ExternalProject/RunCMakeTest.cmake
+++ b/Tests/RunCMake/ExternalProject/RunCMakeTest.cmake
@@ -1,5 +1,8 @@
 include(RunCMake)
 
+run_cmake(NoOptions)
+run_cmake(SourceEmpty)
+run_cmake(SourceMissing)
 run_cmake(CMAKE_CACHE_ARGS)
 run_cmake(CMAKE_CACHE_DEFAULT_ARGS)
 run_cmake(CMAKE_CACHE_mix)
diff --git a/Tests/RunCMake/ExternalProject/SourceEmpty-result.txt b/Tests/RunCMake/ExternalProject/SourceEmpty-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/SourceEmpty-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/ExternalProject/SourceEmpty-stderr.txt b/Tests/RunCMake/ExternalProject/SourceEmpty-stderr.txt
new file mode 100644
index 0000000..58a343c
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/SourceEmpty-stderr.txt
@@ -0,0 +1,18 @@
+^CMake Error at .*/Modules/ExternalProject.cmake:[0-9]+ \(message\):
+  No download info given for 'MyProj' and its source directory:
+
+   .*/Tests/RunCMake/ExternalProject/SourceEmpty-build/SourceEmpty
+
+  is not an existing non-empty directory.  Please specify one of:
+
+   \* SOURCE_DIR with an existing non-empty directory
+   \* URL
+   \* GIT_REPOSITORY
+   \* HG_REPOSITORY
+   \* CVS_REPOSITORY and CVS_MODULE
+   \* SVN_REVISION
+   \* DOWNLOAD_COMMAND
+Call Stack \(most recent call first\):
+  .*/Modules/ExternalProject.cmake:[0-9]+ \(_ep_add_download_command\)
+  SourceEmpty.cmake:[0-9]+ \(ExternalProject_Add\)
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/ExternalProject/SourceEmpty.cmake b/Tests/RunCMake/ExternalProject/SourceEmpty.cmake
new file mode 100644
index 0000000..db746e9
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/SourceEmpty.cmake
@@ -0,0 +1,5 @@
+include(ExternalProject)
+set(source_dir "${CMAKE_CURRENT_BINARY_DIR}/SourceEmpty")
+file(REMOVE_RECURSE "${source_dir}")
+file(MAKE_DIRECTORY "${source_dir}")
+ExternalProject_Add(MyProj SOURCE_DIR "${source_dir}")
diff --git a/Tests/RunCMake/ExternalProject/SourceMissing-result.txt b/Tests/RunCMake/ExternalProject/SourceMissing-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/SourceMissing-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/ExternalProject/SourceMissing-stderr.txt b/Tests/RunCMake/ExternalProject/SourceMissing-stderr.txt
new file mode 100644
index 0000000..e62f7cf
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/SourceMissing-stderr.txt
@@ -0,0 +1,18 @@
+^CMake Error at .*/Modules/ExternalProject.cmake:[0-9]+ \(message\):
+  No download info given for 'MyProj' and its source directory:
+
+   .*/Tests/RunCMake/ExternalProject/SourceMissing-build/SourceMissing
+
+  is not an existing non-empty directory.  Please specify one of:
+
+   \* SOURCE_DIR with an existing non-empty directory
+   \* URL
+   \* GIT_REPOSITORY
+   \* HG_REPOSITORY
+   \* CVS_REPOSITORY and CVS_MODULE
+   \* SVN_REVISION
+   \* DOWNLOAD_COMMAND
+Call Stack \(most recent call first\):
+  .*/Modules/ExternalProject.cmake:[0-9]+ \(_ep_add_download_command\)
+  SourceMissing.cmake:[0-9]+ \(ExternalProject_Add\)
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/ExternalProject/SourceMissing.cmake b/Tests/RunCMake/ExternalProject/SourceMissing.cmake
new file mode 100644
index 0000000..8f369d4
--- /dev/null
+++ b/Tests/RunCMake/ExternalProject/SourceMissing.cmake
@@ -0,0 +1,2 @@
+include(ExternalProject)
+ExternalProject_Add(MyProj SOURCE_DIR SourceMissing)