install: Allow generator expressions in TARGETS DESTINATION (#14317)

This will allow per-config destinations for targets in EXPORT sets.
Using multiple install(TARGETS) with separate CONFIGURATIONS is
rejected as a target appearing more than once in an export set.
Now instead one can write

 install(TARGETS foo EXPORT exp DESTINATION lib/$<CONFIG>)

to get a single logical membership of the target in the export set
while still having a per-config destination.

2 files changed, 4 insertions, 0 deletions

diff --git a/Tests/ExportImport/Import/A/CMakeLists.txt b/Tests/ExportImport/Import/A/CMakeLists.txt
index 358776b..ced7b03 100644
--- a/Tests/ExportImport/Import/A/CMakeLists.txt
+++ b/Tests/ExportImport/Import/A/CMakeLists.txt
@@ -34,6 +34,7 @@ target_link_libraries(imp_testExe1
   exp_testLib5
   exp_testLib6
   exp_testLibCycleA
+  exp_testLibPerConfigDest
   )
 
 # Try building a plugin to an executable imported from the install tree.
@@ -66,6 +67,7 @@ target_link_libraries(imp_testExe1b
   bld_testLib5
   bld_testLib6
   bld_testLibCycleA
+  bld_testLibPerConfigDest
   )
 
 add_custom_target(check_testLib1_genex ALL
diff --git a/Tests/ExportImport/Import/A/imp_testExe1.c b/Tests/ExportImport/Import/A/imp_testExe1.c
index 451998a..150fcef 100644
--- a/Tests/ExportImport/Import/A/imp_testExe1.c
+++ b/Tests/ExportImport/Import/A/imp_testExe1.c
@@ -7,6 +7,7 @@ extern int testLib4lib();
 extern int testLib5();
 extern int testLib6();
 extern int testLibCycleA1();
+extern int testLibPerConfigDest();
 
 /* Switch a symbol between debug and optimized builds to make sure the
    proper library is found from the testLib4 link interface.  */
@@ -21,5 +22,6 @@ int main()
 {
   return (testLib2() + generated_by_testExe1() + testLib3() + testLib4()
           + testLib5() + testLib6() + testLibCycleA1()
+          + testLibPerConfigDest()
           + generated_by_testExe3() + testLib4lib() + testLib4libcfg());
 }