ENH: Test transitive link to subdir-imported lib

This tests linking to an imported target that is not visible but is a
transitive dependency of a target that is visible.  See issue #8843.

Tests/ExportImport/Import/A/CMakeLists.txt

@@ -0,0 +1,69 @@
+# Import targets from the exported build tree.
+include(${Import_BINARY_DIR}/../Export/ExportBuildTree.cmake)
+
+# Import targets from the exported install tree.
+include(${CMAKE_INSTALL_PREFIX}/lib/exp/exp.cmake)
+
+# Try referencing an executable imported from the install tree.
+add_custom_command(
+  OUTPUT ${Import_BINARY_DIR}/exp_generated.c
+  COMMAND exp_testExe1 ${Import_BINARY_DIR}/exp_generated.c
+  DEPENDS exp_testExe1
+  )
+add_custom_command(
+  OUTPUT ${Import_BINARY_DIR}/exp_generated3.c
+  COMMAND exp_testExe3 ${Import_BINARY_DIR}/exp_generated3.c
+  DEPENDS exp_testExe3
+  )
+
+add_executable(imp_testExe1
+  imp_testExe1.c
+  ${Import_BINARY_DIR}/exp_generated.c
+  ${Import_BINARY_DIR}/exp_generated3.c
+  )
+
+# Try linking to a library imported from the install tree.
+target_link_libraries(imp_testExe1 exp_testLib2 exp_testLib3 exp_testLib4)
+
+# Try building a plugin to an executable imported from the install tree.
+add_library(imp_mod1 MODULE imp_mod1.c)
+target_link_libraries(imp_mod1 exp_testExe2)
+
+# Try referencing an executable imported from the build tree.
+add_custom_command(
+  OUTPUT ${Import_BINARY_DIR}/bld_generated.c
+  COMMAND bld_testExe1 ${Import_BINARY_DIR}/bld_generated.c
+  DEPENDS bld_testExe1
+  )
+add_custom_command(
+  OUTPUT ${Import_BINARY_DIR}/bld_generated3.c
+  COMMAND bld_testExe3 ${Import_BINARY_DIR}/bld_generated3.c
+  DEPENDS bld_testExe3
+  )
+
+add_executable(imp_testExe1b
+  imp_testExe1.c
+  ${Import_BINARY_DIR}/bld_generated.c
+  ${Import_BINARY_DIR}/bld_generated3.c
+  )
+
+# Try linking to a library imported from the build tree.
+target_link_libraries(imp_testExe1b bld_testLib2 bld_testLib3 bld_testLib4)
+
+# Try building a plugin to an executable imported from the build tree.
+add_library(imp_mod1b MODULE imp_mod1.c)
+target_link_libraries(imp_mod1b bld_testExe2)
+
+# Export/CMakeLists.txt pretends the RelWithDebInfo (as well as Debug)
+# configuration should link to debug libs.
+foreach(c DEBUG RELWITHDEBINFO)
+  set_property(TARGET imp_testExe1 PROPERTY COMPILE_DEFINITIONS_${c} EXE_DBG)
+  set_property(TARGET imp_testExe1b PROPERTY COMPILE_DEFINITIONS_${c} EXE_DBG)
+endforeach(c)
+
+# Create a library to be linked by another directory in this project
+# to test transitive linking to otherwise invisible imported targets.
+add_library(imp_lib1 STATIC imp_lib1.c)
+target_link_libraries(imp_lib1 exp_testLib2)
+add_library(imp_lib1b STATIC imp_lib1.c)
+target_link_libraries(imp_lib1b bld_testLib2)

Tests/ExportImport/Import/A/imp_lib1.c

@@ -0,0 +1,6 @@
+extern int testLib2(void);
+
+int imp_lib1(void)
+{
+  return testLib2();
+}

Tests/ExportImport/Import/CMakeLists.txt

@@ -6,65 +6,19 @@ if(CMAKE_ANSI_CFLAGS)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")
 endif(CMAKE_ANSI_CFLAGS)
 
-# Import targets from the exported build tree.
-include(${Import_BINARY_DIR}/../Export/ExportBuildTree.cmake)
-
-# Import targets from the exported install tree.
-include(${CMAKE_INSTALL_PREFIX}/lib/exp/exp.cmake)
-
-# Try referencing an executable imported from the install tree.
-add_custom_command(
-  OUTPUT ${Import_BINARY_DIR}/exp_generated.c
-  COMMAND exp_testExe1 ${Import_BINARY_DIR}/exp_generated.c
-  DEPENDS exp_testExe1
-  )
-add_custom_command(
-  OUTPUT ${Import_BINARY_DIR}/exp_generated3.c
-  COMMAND exp_testExe3 ${Import_BINARY_DIR}/exp_generated3.c
-  DEPENDS exp_testExe3
-  )
-
-add_executable(imp_testExe1
-  imp_testExe1.c
-  ${Import_BINARY_DIR}/exp_generated.c
-  ${Import_BINARY_DIR}/exp_generated3.c
-  )
-
-# Try linking to a library imported from the install tree.
-target_link_libraries(imp_testExe1 exp_testLib2 exp_testLib3 exp_testLib4)
-
-# Try building a plugin to an executable imported from the install tree.
-add_library(imp_mod1 MODULE imp_mod1.c)
-target_link_libraries(imp_mod1 exp_testExe2)
-
-# Try referencing an executable imported from the build tree.
-add_custom_command(
-  OUTPUT ${Import_BINARY_DIR}/bld_generated.c
-  COMMAND bld_testExe1 ${Import_BINARY_DIR}/bld_generated.c
-  DEPENDS bld_testExe1
-  )
-add_custom_command(
-  OUTPUT ${Import_BINARY_DIR}/bld_generated3.c
-  COMMAND bld_testExe3 ${Import_BINARY_DIR}/bld_generated3.c
-  DEPENDS bld_testExe3
-  )
-
-add_executable(imp_testExe1b
-  imp_testExe1.c
-  ${Import_BINARY_DIR}/bld_generated.c
-  ${Import_BINARY_DIR}/bld_generated3.c
-  )
-
-# Try linking to a library imported from the build tree.
-target_link_libraries(imp_testExe1b bld_testLib2 bld_testLib3 bld_testLib4)
-
-# Try building a plugin to an executable imported from the build tree.
-add_library(imp_mod1b MODULE imp_mod1.c)
-target_link_libraries(imp_mod1b bld_testExe2)
-
-# Export/CMakeLists.txt pretends the RelWithDebInfo (as well as Debug)
-# configuration should link to debug libs.
-foreach(c DEBUG RELWITHDEBINFO)
-  set_property(TARGET imp_testExe1 PROPERTY COMPILE_DEFINITIONS_${c} EXE_DBG)
-  set_property(TARGET imp_testExe1b PROPERTY COMPILE_DEFINITIONS_${c} EXE_DBG)
-endforeach(c)
+# Import everything in a subdirectory.
+add_subdirectory(A)
+
+# Make sure the imported targets are scoped inside the subdirectory.
+if(TARGET exp_testLib2)
+  message(FATAL_ERROR "Imported target exp_testLib2 is not scoped in subdir!")
+endif()
+if(TARGET bld_testLib2)
+  message(FATAL_ERROR "Imported target bld_testLib2 is not scoped in subdir!")
+endif()
+
+# Test transitive linking to a target imported in the subdirectory.
+add_executable(imp_testTransExe1 imp_testTransExe1.c)
+target_link_libraries(imp_testTransExe1 imp_lib1)
+add_executable(imp_testTransExe1b imp_testTransExe1.c)
+target_link_libraries(imp_testTransExe1b imp_lib1b)

Tests/ExportImport/Import/imp_testTransExe1.c

@@ -0,0 +1,6 @@
+extern int imp_lib1(void);
+
+int main()
+{
+  return imp_lib1();
+}