Genex: Fix stack overflow in transitive property evaluation.

Commit v2.8.11~156^2~2 (Expand includes and defines transitively
in 'external' genexes., 2013-02-13) introduced a recursive loop
and a stack overflow during evaluation of a link implementation
which depends on a transitive property, such as

 add_library(empty1 ...)
 add_library(empty2 ...)
 target_link_libraries(empty1
   PRIVATE
     $<$<STREQUAL:$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>,/foo/bar>:empty2>
 )

There is no use-case for code like that currently, but it should not
cause a stack overflow.

Avoid the recursion by reporting an error early if a case like this
is found.

20 files changed, 128 insertions, 0 deletions

diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1-result.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1-stderr.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1-stderr.txt
new file mode 100644
index 0000000..7e002f5
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1-stderr.txt
@@ -0,0 +1,10 @@
+CMake Error at LinkImplementationCycle1.cmake:5 \(target_link_libraries\):
+  Error evaluating generator expression:
+
+    \$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>
+
+  \$<TARGET_PROPERTY:...> expression in link libraries evaluation depends on
+  target property which is transitive over the link libraries, creating a
+  recursion.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:8 \(include\)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1.cmake b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1.cmake
new file mode 100644
index 0000000..4b60214
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle1.cmake
@@ -0,0 +1,8 @@
+
+add_library(empty1 empty.cpp)
+add_library(empty2 empty.cpp)
+
+target_link_libraries(empty1
+  LINK_PUBLIC
+    $<$<STREQUAL:$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>,/foo/bar>:empty2>
+)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2-result.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2-stderr.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2-stderr.txt
new file mode 100644
index 0000000..2f72de6
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2-stderr.txt
@@ -0,0 +1,10 @@
+CMake Error at LinkImplementationCycle2.cmake:5 \(target_link_libraries\):
+  Error evaluating generator expression:
+
+    \$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>
+
+  \$<TARGET_PROPERTY:...> expression in link libraries evaluation depends on
+  target property which is transitive over the link libraries, creating a
+  recursion.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:8 \(include\)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2.cmake b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2.cmake
new file mode 100644
index 0000000..557eac1
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle2.cmake
@@ -0,0 +1,8 @@
+
+add_library(empty1 empty.cpp)
+add_library(empty2 empty.cpp)
+
+target_link_libraries(empty1
+  LINK_PUBLIC
+    $<$<STREQUAL:$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>,/foo/bar>:empty2>
+)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3-result.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3-result.txt
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3-result.txt
@@ -0,0 +1 @@
+0
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3-stderr.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3-stderr.txt
new file mode 100644
index 0000000..10f3293
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3-stderr.txt
@@ -0,0 +1 @@
+^$
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3.cmake b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3.cmake
new file mode 100644
index 0000000..0f921d4
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle3.cmake
@@ -0,0 +1,10 @@
+
+add_library(empty1 empty.cpp)
+add_library(empty2 empty.cpp)
+
+# This is OK, because evaluating the INCLUDE_DIRECTORIES is not affected by
+# the content of the INTERFACE_LINK_LIBRARIES.
+target_link_libraries(empty1
+  INTERFACE
+    $<$<STREQUAL:$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>,/foo/bar>:empty2>
+)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4-result.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4-stderr.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4-stderr.txt
new file mode 100644
index 0000000..5cfeb0a
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4-stderr.txt
@@ -0,0 +1,8 @@
+CMake Error:
+  Error evaluating generator expression:
+
+    \$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>
+
+  \$<TARGET_PROPERTY:...> expression in link libraries evaluation depends on
+  target property which is transitive over the link libraries, creating a
+  recursion.
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4.cmake b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4.cmake
new file mode 100644
index 0000000..ab6d0b2
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle4.cmake
@@ -0,0 +1,14 @@
+
+add_library(empty1 empty.cpp)
+add_library(empty2 empty.cpp)
+
+# The INTERFACE_INCLUDE_DIRECTORIES do not depend on the link interface.
+# On its own, this is fine. It is only when used by empty3 that an error
+# is appropriately issued.
+target_link_libraries(empty1
+  INTERFACE
+    $<$<STREQUAL:$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>,/foo/bar>:empty2>
+)
+
+add_library(empty3 empty.cpp)
+target_link_libraries(empty3 empty1)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5-result.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5-stderr.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5-stderr.txt
new file mode 100644
index 0000000..5cfeb0a
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5-stderr.txt
@@ -0,0 +1,8 @@
+CMake Error:
+  Error evaluating generator expression:
+
+    \$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>
+
+  \$<TARGET_PROPERTY:...> expression in link libraries evaluation depends on
+  target property which is transitive over the link libraries, creating a
+  recursion.
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5.cmake b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5.cmake
new file mode 100644
index 0000000..dc180e3
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle5.cmake
@@ -0,0 +1,10 @@
+
+add_library(empty1 INTERFACE IMPORTED)
+add_library(empty2 INTERFACE IMPORTED)
+
+set_property(TARGET empty1 PROPERTY INTERFACE_LINK_LIBRARIES
+  $<$<STREQUAL:$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>,/foo/bar>:empty2>
+)
+
+add_library(empty3 empty.cpp)
+target_link_libraries(empty3 empty1)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6-result.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6-stderr.txt b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6-stderr.txt
new file mode 100644
index 0000000..5cfeb0a
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6-stderr.txt
@@ -0,0 +1,8 @@
+CMake Error:
+  Error evaluating generator expression:
+
+    \$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>
+
+  \$<TARGET_PROPERTY:...> expression in link libraries evaluation depends on
+  target property which is transitive over the link libraries, creating a
+  recursion.
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6.cmake b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6.cmake
new file mode 100644
index 0000000..91252d0
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/LinkImplementationCycle6.cmake
@@ -0,0 +1,14 @@
+
+add_library(empty1 SHARED empty.cpp)
+add_library(empty2 SHARED empty.cpp)
+
+# The INTERFACE_INCLUDE_DIRECTORIES do not depend on the link interface.
+# On its own, this is fine. It is only when used by empty3 that an error
+# is appropriately issued.
+target_link_libraries(empty1
+  INTERFACE
+    $<$<STREQUAL:$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>,/foo/bar>:empty2>
+)
+
+add_library(empty3 SHARED empty.cpp)
+target_link_libraries(empty3 empty1)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/RunCMakeTest.cmake b/Tests/RunCMake/TargetPropertyGeneratorExpressions/RunCMakeTest.cmake
index 0ee3238..645a57d 100644
--- a/Tests/RunCMake/TargetPropertyGeneratorExpressions/RunCMakeTest.cmake
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/RunCMakeTest.cmake
@@ -15,3 +15,9 @@ run_cmake(BadInvalidName5)
 run_cmake(BadInvalidName6)
 run_cmake(BadInvalidName7)
 run_cmake(BadInvalidName8)
+run_cmake(LinkImplementationCycle1)
+run_cmake(LinkImplementationCycle2)
+run_cmake(LinkImplementationCycle3)
+run_cmake(LinkImplementationCycle4)
+run_cmake(LinkImplementationCycle5)
+run_cmake(LinkImplementationCycle6)
diff --git a/Tests/RunCMake/TargetPropertyGeneratorExpressions/empty.cpp b/Tests/RunCMake/TargetPropertyGeneratorExpressions/empty.cpp
new file mode 100644
index 0000000..bfbbdde
--- /dev/null
+++ b/Tests/RunCMake/TargetPropertyGeneratorExpressions/empty.cpp
@@ -0,0 +1,7 @@
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int empty()
+{
+  return 0;
+}