Properly link to xpress loader even is coin is disabled

src/cpp/multisolver_interface/CMakeLists.txt

@@ -53,17 +53,19 @@ target_include_directories (solvers
 		${xpansion_interfaces_path}	
 )
 
-
+target_link_libraries(solvers
+		PUBLIC
+		${CMAKE_DL_LIBS}
+)
 
 #CLP-CBC
 if(COIN_OR)
 	target_link_libraries (solvers
-		PUBLIC
+		PRIVATE
 			Coin::Clp
 			Coin::Cgl
 			Coin::CoinUtils
 			Coin::Osi
 			Coin::Cbc
-		   ${CMAKE_DL_LIBS}
 	)
 endif()

src/cpp/multisolver_interface/environment.cc

@@ -21,6 +21,9 @@
 #include <sstream>
 #include <string>
 
+namespace Solver {
+class DynamicLibrary;
+}
 namespace LoadXpress {
 
 #define STRINGIFY2(X) #X
@@ -141,7 +144,7 @@ std::function<int(XPRSprob prob, int attrib, int* p_value)> XPRSgetintattrib =
 XpressLoader::XpressLoader(std::shared_ptr<ILoggerXpansion> logger)
     : logger_(std::move(logger)) {}
 
-bool XpressLoader::LoadXpressFunctions(DynamicLibrary* xpress_dynamic_library) {
+bool XpressLoader::LoadXpressFunctions(Solver::DynamicLibrary* xpress_dynamic_library) {
   // This was generated with the parse_header_xpress.py script.
   // See the comment at the top of the script.
 
@@ -299,7 +302,7 @@ bool XpressLoader::LoadXpressDynamicLibrary(std::string& xpresspath) {
   static std::string xpress_lib_path;
   static std::once_flag xpress_loading_done;
   static bool ret;
-  static DynamicLibrary xpress_library;
+  static Solver::DynamicLibrary xpress_library;
   // static std::mutex mutex;
 
   // mutex.lock();

src/cpp/multisolver_interface/include/multisolver_interface/dynamic_library.h

@@ -26,6 +26,7 @@
 #include <dlfcn.h>
 #endif
 
+namespace Solver {
 class DynamicLibrary {
   static constexpr size_t kMaxFunctionsNotFound = 10;
 
@@ -111,5 +112,6 @@ class DynamicLibrary {
     }
   };
 };
+}
 
 #endif  // OR_TOOLS_BASE_DYNAMIC_LIBRARY_H_

src/cpp/multisolver_interface/include/multisolver_interface/environment.h

@@ -59,7 +59,7 @@ class XpressLoader {
   std::vector<std::string> XpressDynamicLibraryPotentialPaths(); 
   std::string GetXpressVarFromEnvironmentVariables(const char* XPRESS_var,
                                                   bool verbose = true);
-  bool LoadXpressFunctions(DynamicLibrary* xpress_dynamic_library);
+  bool LoadXpressFunctions(Solver::DynamicLibrary* xpress_dynamic_library);
   int loadLicence(const std::string& lib_path, bool verbose);
 };