simpler DLL definitions

CMakeLists.txt

@@ -274,12 +274,14 @@ if(MSVC)
       set(${VAR} "${${VAR}} /MP")
     endif(NOT ${VAR} MATCHES "/MP")
   endforeach(VAR)
+  if(ENABLE_PRIVATE_API)
     if(ENABLE_BUILD_DYNAMIC OR ENABLE_BUILD_SHARED)
       # automatically export .def file with all symbols (requires CMake 3.4);
       # depending on the compiling options this might lead to more than 64k export
       # symbols; just trim the .def file to keep the ones you need
       set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
     endif(ENABLE_BUILD_DYNAMIC OR ENABLE_BUILD_SHARED)
+  endif(ENABLE_PRIVATE_API)
 endif(MSVC)
 
 if(ENABLE_OPENMP)
@@ -1520,16 +1522,13 @@ endif(ENABLE_BUILD_LIB)
 
 # shared library target
 if(ENABLE_BUILD_SHARED OR ENABLE_BUILD_DYNAMIC)
-  if(WIN32 OR CYGWIN)
-    add_definitions(-DGMSH_DLL)
-  endif(WIN32 OR CYGWIN)
   add_library(shared SHARED ${GMSH_SRC})
   set_target_properties(shared PROPERTIES OUTPUT_NAME gmsh
      VERSION ${GMSH_MAJOR_VERSION}.${GMSH_MINOR_VERSION}.${GMSH_PATCH_VERSION}
      SOVERSION ${GMSH_MAJOR_VERSION}.${GMSH_MINOR_VERSION})
   if(WIN32 OR CYGWIN)
     set_target_properties(shared PROPERTIES PREFIX "" IMPORT_PREFIX ""
-      IMPORT_SUFFIX ".lib" COMPILE_FLAGS -DGMSH_DLL_EXPORT)
+      IMPORT_SUFFIX ".lib" COMPILE_FLAGS "-DGMSH_DLL -DGMSH_DLL_EXPORT")
   endif(WIN32 OR CYGWIN)
   target_link_libraries(shared ${LINK_LIBRARIES})
   if(MSVC AND ENABLE_MSVC_STATIC_RUNTIME)

demos/api/crack.py

+import gmsh
+import sys
+
+gmsh.initialize(sys.argv)
+gmsh.fltk.initialize()
+
+gmsh.option.setNumber("General.Terminal", 1)
+
+gmsh.model.add("square with cracks")
+
+surf1 = 1
+gmsh.model.occ.addRectangle(0, 0, 0, 1, 1, surf1)
+
+pt1 = gmsh.model.occ.addPoint(0.2, 0.2, 0)
+pt2 = gmsh.model.occ.addPoint(0.4, 0.4, 0)
+line1 = gmsh.model.occ.addLine(pt1, pt2)
+pt3 = gmsh.model.occ.addPoint(0.6, 0.1, 0)
+pt4 = gmsh.model.occ.addPoint(0.1, 0.3, 0)
+line2 = gmsh.model.occ.addLine(pt3, pt4)
+
+o, m = gmsh.model.occ.fragment([(2,surf1)], [(1,line1), (1,line2)])
+gmsh.model.occ.synchronize()
+
+# m contains, for each input entity (surf1, line1 and line2), the child entities
+# (if any) after the fragmentation, as lists of tuples. To apply the crack
+# plugin we group all the intersecting lines in a physical group
+
+new_surf = m[0][0][1]
+new_lines = [item[1] for sublist in m[1:] for item in sublist]
+
+gmsh.model.addPhysicalGroup(2, [new_surf], 100)
+gmsh.model.addPhysicalGroup(1, new_lines, 101)
+
+gmsh.model.mesh.generate(2)
+
+gmsh.plugin.setNumber("Crack", "PhysicalGroup", 101)
+gmsh.plugin.run("Crack")
+
+gmsh.fltk.run()
+
+gmsh.finalize()