Update CMakeLists.txt, FindXpress.cmake

CMakeLists.txt

+cmake_minimum_required(VERSION 3.15 FATAL_ERROR)
+
+message("Checking files for XPRESS.")
+project(xpress CXX)
+
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}")
+
+find_package(Xpress)
+
+
+if(${Xpress_FOUND})
+
+    add_library(xpress INTERFACE)
+    set_target_properties(xpress  PROPERTIES  INTERFACE_INCLUDE_DIRECTORIES ${XPRESS_INCLUDE_DIRS})
+    set_target_properties(xpress  PROPERTIES  INTERFACE_COMPILE_DEFINITIONS HAVE_XPRESS)
+    #set_target_link_directories(xpress INTERFACE target_link_directories)
+    add_library(xpress-cxx SHARED IMPORTED)
+    set_target_properties(xpress-cxx  PROPERTIES  IMPORTED_LOCATION ${XPRESS_LIBRARY} )
+    add_library(xpress-cpp SHARED IMPORTED)
+    set_target_properties(xpress-cpp  PROPERTIES  IMPORTED_LOCATION ${XPRESS_LIBRARY_cpp})
+    
+    #if(WIN32)
+    #
+    #    add_library(xpress-cxx-d STATIC IMPORTED)
+    #    set_target_properties(xpress-cxx-d  PROPERTIES  IMPORTED_LOCATION ${GUROBI_CXX_LIBRARY_D})
+    #    target_link_libraries(xpress INTERFACE debug xpress-cxx-d)
+    #    target_link_libraries(xpress INTERFACE optimized xpress-cxx)
+    #
+    #else()
+        find_package(Threads REQUIRED)
+        target_link_libraries(xpress INTERFACE xpress-cxx xpress-cpp  Threads::Threads)
+
+    #endif()
+
+
+
+else()
+
+    add_library(xpress INTERFACE)
+    message("No supported version of Xpress could be found. A dummy target will be used instead and the flag HAVE_XPRESS will not be defined.")
+    message("This may be OK depending on the application (e.g., in MAiNGO), but you will not be able to actually use Xpress.")
+
+endif()
+
+

FindXpress.cmake

+#adapted from SCIPOPT
+find_path(XPRESS_INCLUDE_DIRS
+    xprs.h
+    HINTS ${XPRESS_DIR} $ENV{XPRESS_DIR}
+    PATH_SUFFIXES include)
+
+# todo: enable recursive search
+find_library(XPRESS_LIBRARY
+    NAMES xprs
+    HINTS ${XPRESS_DIR} $ENV{XPRESS_DIR}
+    PATH_SUFFIXES lib)
+
+find_library(XPRESS_LIBRARY_cpp
+    NAMES xprb
+    HINTS ${XPRESS_DIR} $ENV{XPRESS_DIR}
+    PATH_SUFFIXES lib)
+
+
+# todo properly check when pthread is necessary
+set(XPRESS_LIBRARIES ${XPRESS_LIBRARY} ${XPRESS_LIBRARY_cpp})
+
+message(STATUS "XPRESS C++ library: ${XPRESS_LIBRARIES}")
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Xpress DEFAULT_MSG
+    XPRESS_INCLUDE_DIRS)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Xpress DEFAULT_MSG XPRESS_LIBRARY)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Xpress DEFAULT_MSG XPRESS_LIBRARY_cpp)
+#FIND_PACKAGE_HANDLE_STANDARD_ARGS(Xpress DEFAULT_MSG XPRESS_LINK_DIR)
+mark_as_advanced(XPRESS_INCLUDE_DIRS)
+mark_as_advanced(XPRESS_LIBRARY)