Test link multiplicity export/import

We test that LINK_INTERFACE_MULTIPLICITY propagates through export() and
install(EXPORT) into dependent projects.  A simple cycle of two archives
that need to be scanned three times ensures that the importing project
uses the multiplicity correctly.

Tests/ExportImport/Export/CMakeLists.txt

@@ -73,12 +73,22 @@ target_link_libraries(testLib4
 add_executable(testExe3 testExe3.c)
 set_property(TARGET testExe3 PROPERTY MACOSX_BUNDLE 1)
 
+# Test cyclic dependencies.
+add_library(testLibCycleA STATIC
+  testLibCycleA1.c testLibCycleA2.c testLibCycleA3.c)
+add_library(testLibCycleB STATIC
+  testLibCycleB1.c testLibCycleB2.c testLibCycleB3.c)
+target_link_libraries(testLibCycleA testLibCycleB)
+target_link_libraries(testLibCycleB testLibCycleA)
+set_property(TARGET testLibCycleA PROPERTY LINK_INTERFACE_MULTIPLICITY 3)
+
 # Install and export from install tree.
 install(
   TARGETS
   testExe1 testLib1 testLib2 testExe2 testLib3 testLib4 testExe3
   testExe2lib testLib4lib testLib4libdbg testLib4libopt
   testLib6
+  testLibCycleA testLibCycleB
   EXPORT exp
   RUNTIME DESTINATION bin
   LIBRARY DESTINATION lib NAMELINK_SKIP
@@ -116,6 +126,7 @@ export(TARGETS testExe1 testLib1 testLib2 testLib3
   )
 export(TARGETS testExe2 testLib4 testLib5 testLib6 testExe3 testExe2lib
   testLib4lib testLib4libdbg testLib4libopt
+  testLibCycleA testLibCycleB
   NAMESPACE bld_
   APPEND FILE ExportBuildTree.cmake
   )

Tests/ExportImport/Export/testLibCycleA1.c

@@ -0,0 +1,2 @@
+extern int testLibCycleB1(void);
+int testLibCycleA1(void) { return testLibCycleB1(); }

Tests/ExportImport/Export/testLibCycleA2.c

@@ -0,0 +1,2 @@
+extern int testLibCycleB2(void);
+int testLibCycleA2(void) { return testLibCycleB2(); }

Tests/ExportImport/Export/testLibCycleA3.c

@@ -0,0 +1,2 @@
+extern int testLibCycleB3(void);
+int testLibCycleA3(void) { return testLibCycleB3(); }

Tests/ExportImport/Export/testLibCycleB1.c

@@ -0,0 +1,2 @@
+extern int testLibCycleA2(void);
+int testLibCycleB1(void) { return testLibCycleA2(); }

Tests/ExportImport/Export/testLibCycleB2.c

@@ -0,0 +1,2 @@
+extern int testLibCycleA3(void);
+int testLibCycleB2(void) { return testLibCycleA3(); }

Tests/ExportImport/Export/testLibCycleB3.c

@@ -0,0 +1 @@
+int testLibCycleB3(void) { return 0; }

Tests/ExportImport/Import/A/CMakeLists.txt

@@ -29,6 +29,7 @@ target_link_libraries(imp_testExe1
   exp_testLib4
   exp_testLib5
   exp_testLib6
+  exp_testLibCycleA
   )
 
 # Try building a plugin to an executable imported from the install tree.
@@ -60,6 +61,7 @@ target_link_libraries(imp_testExe1b
   bld_testLib4
   bld_testLib5
   bld_testLib6
+  bld_testLibCycleA
   )
 
 # Try building a plugin to an executable imported from the build tree.

Tests/ExportImport/Import/A/imp_testExe1.c

@@ -6,6 +6,7 @@ extern int testLib4();
 extern int testLib4lib();
 extern int testLib5();
 extern int testLib6();
+extern int testLibCycleA1();
 
 /* Switch a symbol between debug and optimized builds to make sure the
    proper library is found from the testLib4 link interface.  */
@@ -19,6 +20,6 @@ extern testLib4libcfg(void);
 int main()
 {
   return (testLib2() + generated_by_testExe1() + testLib3() + testLib4()
-          + testLib5() + testLib6()
+          + testLib5() + testLib6() + testLibCycleA1()
           + generated_by_testExe3() + testLib4lib() + testLib4libcfg());
 }