cmake: Rework FindSCIP.cmake

note: currently scip do not provide alias targets when installing scip.

cmake/FindSCIP.cmake

@@ -20,7 +20,7 @@ This module determines the SCIP library of the system.
 IMPORTED Targets
 ^^^^^^^^^^^^^^^^
 
-This module defines :prop_tgt:`IMPORTED` target ``SCIP::SCIP``, if
+This module defines :prop_tgt:`IMPORTED` target ``SCIP::libscip``, if
 SCIP has been found.
 
 Result Variables
@@ -45,6 +45,10 @@ find_package(SCIP QUIET NO_MODULE)
 # if we found the SCIP cmake package then we are done.
 if(SCIP_FOUND)
   find_package_handle_standard_args(SCIP CONFIG_MODE)
+  if(NOT TARGET SCIP::libscip)
+    message(WARNING "SCIP::libscip not provided")
+    add_library(SCIP::libscip ALIAS libscip)
+  endif()
   return()
 endif()
 
@@ -69,15 +73,15 @@ else()
   set(SCIP_FOUND TRUE)
 endif()
 
-if(SCIP_FOUND AND NOT TARGET SCIP::SCIP)
-  add_library(SCIP::SCIP UNKNOWN IMPORTED)
+if(SCIP_FOUND AND NOT TARGET SCIP::libscip)
+  add_library(SCIP::libscip UNKNOWN IMPORTED)
 
-  set_target_properties(SCIP::SCIP PROPERTIES
+  set_target_properties(SCIP::libscip PROPERTIES
     INTERFACE_INCLUDE_DIRECTORIES "${SCIP_ROOT}/include")
 
   if(APPLE)
     set(SCIP_ARCH darwin.x86_64.gnu.opt)
-    set_property(TARGET SCIP::SCIP PROPERTY IMPORTED_LOCATION
+    set_property(TARGET SCIP::libscip PROPERTY IMPORTED_LOCATION
       -force_load
       ${SCIP_ROOT}/lib/libscip.a
       ${SCIP_ROOT}/lib/libscipopt.a
@@ -86,14 +90,14 @@ if(SCIP_FOUND AND NOT TARGET SCIP::SCIP)
       )
   elseif(UNIX)
     set(SCIP_ARCH linux.x86_64.gnu.opt)
-    set_property(TARGET SCIP::SCIP PROPERTY IMPORTED_LOCATION
+    set_property(TARGET SCIP::libscip PROPERTY IMPORTED_LOCATION
       ${SCIP_ROOT}/lib/libscip.a
       ${SCIP_ROOT}/lib/libscipopt.a
       ${SCIP_ROOT}/lib/libsoplex.a
       ${SCIP_ROOT}/lib/libsoplex.${SCIP_ARCH}.a
       )
   elseif(MSVC)
-    set_property(TARGET SCIP::SCIP PROPERTY IMPORTED_LOCATION
+    set_property(TARGET SCIP::libscip PROPERTY IMPORTED_LOCATION
       ${SCIP_ROOT}/lib/scip.lib
       ${SCIP_ROOT}/lib/soplex.lib
       ignore:4006

cmake/system_deps.cmake

@@ -96,6 +96,10 @@ endif()
 if(USE_SCIP)
   if(NOT BUILD_SCIP AND NOT TARGET SCIP::libscip)
     find_package(SCIP REQUIRED)
+    if(TARGET libscip AND NOT TARGET SCIP::libscip)
+      message(WARNING "SCIP::libscip not provided")
+      add_library(SCIP::libscip ALIAS libscip)
+    endif()
   endif()
 endif()