Output complete list of libraries for external Makefiles

There is a Makefile include, `vtkm_config.mk`, and a package include,
`vtkm.pc`, that are configured so that external programs that do not use
CMake have a way of importing VTK-m's configuration. However, the set of
libraries was hardcoded. In particular, many of the new filter libraries
were missing.

Rather than try to maintain this list manually, use the module mechanism
in the CMake configuration to get a list of libraries built and
automatically build these lists.

CMakeLists.txt

@@ -330,6 +330,33 @@ write_basic_package_version_file(
   VERSION ${VTKm_VERSION}
   COMPATIBILITY ExactVersion )
 
+#-----------------------------------------------------------------------------
+# Create makefile/package files for projects not using CMake
+
+set(lib_args)
+vtkm_module_get_list(module_list)
+list(REVERSE module_list)
+foreach(module IN LISTS module_list)
+  get_target_property(type ${module} TYPE)
+  if (NOT type MATCHES "LIBRARY" OR type STREQUAL "INTERFACE_LIBRARY")
+    continue()
+  endif()
+  get_target_property(library ${module} OUTPUT_NAME)
+  if (NOT library)
+    continue()
+  endif()
+  set(lib_args "${lib_args} \\
+    -l${library}")
+endforeach()
+if (TARGET vtkmdiympi)
+  set(lib_args "${lib_args} \\
+    -lvtkmdiympi")
+endif()
+if (TARGET vtkmdiympi_nompi)
+  set(lib_args "${lib_args} \\
+    -lvtkmdiympi_nompi")
+endif()
+
 configure_file(${VTKm_SOURCE_DIR}/config/vtkm_config.mk.in
   ${VTKm_BINARY_DIR}/config/vtkm_config.mk @ONLY)
 install(FILES ${VTKm_BINARY_DIR}/config/vtkm_config.mk

config/vtkm.pc.in

@@ -18,14 +18,4 @@ Name: VTKm
 Description: The VTKm library
 Version: @VTKm_VERSION@
 Cflags: -I${includedir}/vtkm-@CMAKE_INSTALL_PREFIX@
-Libs: -L${libdir} \
-    -lvtkm_rendering-@VTKm_VERSION@ \
-    -lvtkm_filter_contour-@VTKm_VERSION@ \
-    -lvtkm_filter_gradient-@VTKm_VERSION@ \
-    -lvtkm_filter_extra-@VTKm_VERSION@ \
-    -lvtkm_filter_common-@VTKm_VERSION@ \
-    -lvtkm_worklet-@VTKm_VERSION@ \
-    -lvtkm_source-@VTKm_VERSION@ \
-    -lvtkm_io-@VTKm_VERSION@ \
-    -lvtkm_cont-@VTKm_VERSION@ \
-    -lvtkmdiympi_nompi
+Libs: -L${libdir}@lib_args@

config/vtkm_config.mk.in

@@ -25,14 +25,4 @@ VTKm_ENABLE_EGL_CONTEXT = @VTKm_ENABLE_EGL_CONTEXT@
 VTKm_ENABLE_MPI = @VTKm_ENABLE_MPI@
 
 VTKm_INCLUDE_FLAGS = -I $(VTKm_DIR)/include
-VTKm_LIB_FLAGS = -L $(VTKm_DIR)/lib \
-    -lvtkm_rendering-$(VTKM_VERSION) \
-    -lvtkm_filter_contour-$(VTKM_VERSION) \
-    -lvtkm_filter_gradient-$(VTKM_VERSION) \
-    -lvtkm_filter_extra-$(VTKM_VERSION) \
-    -lvtkm_filter_common-$(VTKM_VERSION) \
-    -lvtkm_worklet-$(VTKM_VERSION) \
-    -lvtkm_source-$(VTKM_VERSION) \
-    -lvtkm_io-$(VTKM_VERSION) \
-    -lvtkm_cont-$(VTKM_VERSION) \
-    -lvtkmdiympi_nompi
+VTKm_LIB_FLAGS = -L $(VTKm_DIR)/lib@lib_args@

docs/changelog/external-lib-lists.md

@@ -0,0 +1,11 @@
+# Output complete list of libraries for external Makefiles
+
+There is a Makefile include, `vtkm_config.mk`, and a package include,
+`vtkm.pc`, that are configured so that external programs that do not use
+CMake have a way of importing VTK-m's configuration. However, the set of
+libraries was hardcoded. In particular, many of the new filter libraries
+were missing.
+
+Rather than try to maintain this list manually, the new module mechanism
+in the CMake configuration is used to get a list of libraries built and
+automatically build these lists.