[cleanup] Remove enable trick for GMP.

cmake/modules/AddGMPFlags.cmake

@@ -5,9 +5,6 @@ function(add_dune_gmp_flags _targets)
   if(GMP_FOUND)
     foreach(_target ${_targets})
       target_link_libraries(${_target} ${GMP_LIBRARIES})
-      set_property(TARGET ${_target}
-        APPEND_STRING
-        PROPERTY COMPILE_FLAGS "-DENABLE_GMP=1 ")
       foreach(_path ${GMP_INCLUDE_DIRS})
         set_property(TARGET ${_target}
           APPEND_STRING

cmake/modules/FindGMP.cmake

@@ -64,7 +64,6 @@ mark_as_advanced(GMP_LIB GMPXX_LIB GMP_INCLUDE_DIR)
 if(GMP_FOUND)
   set(GMP_INCLUDE_DIRS ${GMP_INCLUDE_DIR})
   set(GMP_LIBRARIES ${GMP_LIB} ${GMPXX_LIB})
-  set(GMP_COMPILE_FLAGS "-DENABLE_GMP=1")
   # log result
   file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
     "Determing location of GMP succeded:\n"
@@ -84,7 +83,6 @@ set(HAVE_GMP ${GMP_FOUND})
 
 # register all GMP related flags
 if(HAVE_GMP)
-  dune_register_package_flags(COMPILE_DEFINITIONS "ENABLE_GMP=1"
-                              LIBRARIES "${GMP_LIB};${GMPXX_LIB}"
+  dune_register_package_flags(LIBRARIES "${GMP_LIB};${GMPXX_LIB}"
                               INCLUDE_DIRS "${GMP_INCLUDE_DIR}")
 endif()

config.h.cmake

@@ -43,9 +43,8 @@
    deprecated MPI_CPPFLAGS) */
 #cmakedefine HAVE_MPI ENABLE_MPI
 
-/* Define if you have the GNU GMP library. The value should be ENABLE_GMP
-   to facilitate activating and deactivating GMP using compile flags. */
-#cmakedefine HAVE_GMP ENABLE_GMP
+/* Define to 1 if you have the GNU GMP library. */
+#cmakedefine HAVE_GMP 1
 
 /* Define to 1 if you have the symbol mprotect. */
 #cmakedefine HAVE_MPROTECT 1

dune/common/promotiontraits.hh

@@ -28,7 +28,7 @@ namespace Dune {
 
   // Specialization for the case of two equal types
   // One should think that the generic template should handle this case as well.
-  // However, the fvectortest.cc unit test fails without it if ENABLE_GMP is set.
+  // However, the fvectortest.cc unit test fails without it if gmp is used.
   template <typename T1>
   struct PromotionTraits<T1,T1> { typedef T1 PromotedType; };