ENH: Allow IMPORTED_IMPLIB w/o IMPORTED_LOCATION

Linking to a Windows shared library (.dll) requires only its import
library (.lib).  This teaches CMake to recognize SHARED IMPORTED library
targets that set only IMPORTED_IMPLIB and not IMPORTED_LOCATION.

2 files changed, 14 insertions, 2 deletions

diff --git a/Tests/ExportImport/Import/A/CMakeLists.txt b/Tests/ExportImport/Import/A/CMakeLists.txt
index 16cff2d..e874cdb 100644
--- a/Tests/ExportImport/Import/A/CMakeLists.txt
+++ b/Tests/ExportImport/Import/A/CMakeLists.txt
@@ -23,7 +23,12 @@ add_executable(imp_testExe1
   )
 
 # Try linking to a library imported from the install tree.
-target_link_libraries(imp_testExe1 exp_testLib2 exp_testLib3 exp_testLib4)
+target_link_libraries(imp_testExe1
+  exp_testLib2
+  exp_testLib3
+  exp_testLib4
+  exp_testLib5
+  )
 
 # Try building a plugin to an executable imported from the install tree.
 add_library(imp_mod1 MODULE imp_mod1.c)
@@ -48,7 +53,12 @@ add_executable(imp_testExe1b
   )
 
 # Try linking to a library imported from the build tree.
-target_link_libraries(imp_testExe1b bld_testLib2 bld_testLib3 bld_testLib4)
+target_link_libraries(imp_testExe1b
+  bld_testLib2
+  bld_testLib3
+  bld_testLib4
+  bld_testLib5
+  )
 
 # Try building a plugin to an executable imported from the build tree.
 add_library(imp_mod1b MODULE imp_mod1.c)
diff --git a/Tests/ExportImport/Import/A/imp_testExe1.c b/Tests/ExportImport/Import/A/imp_testExe1.c
index 6424d33..6a6ba0f 100644
--- a/Tests/ExportImport/Import/A/imp_testExe1.c
+++ b/Tests/ExportImport/Import/A/imp_testExe1.c
@@ -4,6 +4,7 @@ extern int testLib2();
 extern int testLib3();
 extern int testLib4();
 extern int testLib4lib();
+extern int testLib5();
 
 /* Switch a symbol between debug and optimized builds to make sure the
    proper library is found from the testLib4 link interface.  */
@@ -17,5 +18,6 @@ extern testLib4libcfg(void);
 int main()
 {
   return (testLib2() + generated_by_testExe1() + testLib3() + testLib4()
+          + testLib5()
           + generated_by_testExe3() + testLib4lib() + testLib4libcfg());
 }