cmTarget: Allow transitive evaluation of SOURCES property.

Extend the cmGeneratorExpressionDAGChecker with an interface
returning the name of the top target.  Use that to determine
when there is a DAG violation, as required by the RunCMake.Languages
tests.

4 files changed, 24 insertions, 0 deletions

diff --git a/Tests/SourcesProperty/CMakeLists.txt b/Tests/SourcesProperty/CMakeLists.txt
new file mode 100644
index 0000000..0b3097e
--- /dev/null
+++ b/Tests/SourcesProperty/CMakeLists.txt
@@ -0,0 +1,10 @@
+
+cmake_minimum_required(VERSION 3.0)
+
+project(SourcesProperty)
+
+add_library(iface INTERFACE)
+set_property(TARGET iface PROPERTY INTERFACE_SOURCES iface.cpp)
+
+add_executable(SourcesProperty main.cpp)
+target_link_libraries(SourcesProperty iface)
diff --git a/Tests/SourcesProperty/iface.cpp b/Tests/SourcesProperty/iface.cpp
new file mode 100644
index 0000000..e38ac37
--- /dev/null
+++ b/Tests/SourcesProperty/iface.cpp
@@ -0,0 +1,5 @@
+
+int iface()
+{
+  return 0;
+}
diff --git a/Tests/SourcesProperty/iface.h b/Tests/SourcesProperty/iface.h
new file mode 100644
index 0000000..2cac248
--- /dev/null
+++ b/Tests/SourcesProperty/iface.h
@@ -0,0 +1,2 @@
+
+int iface();
diff --git a/Tests/SourcesProperty/main.cpp b/Tests/SourcesProperty/main.cpp
new file mode 100644
index 0000000..ae4f305
--- /dev/null
+++ b/Tests/SourcesProperty/main.cpp
@@ -0,0 +1,7 @@
+
+#include "iface.h"
+
+int main(int argc, char** argv)
+{
+  return iface();
+}