Improve export and installation part

Currently only the core module is supported for export and installation

Former-commit-id: 1de583630778447f756738f30e1657181cb40f47

shared/cmake/libigl.cmake

@@ -77,11 +77,11 @@ target_include_directories(igl_common SYSTEM INTERFACE
   $<BUILD_INTERFACE:${LIBIGL_SOURCE_DIR}>
   $<INSTALL_INTERFACE:include>
 )
+# Export igl_common as igl::common
+set_property(TARGET igl_common PROPERTY EXPORT_NAME common)
 if(LIBIGL_USE_STATIC_LIBRARY)
   target_compile_definitions(igl_common INTERFACE -DIGL_STATIC_LIBRARY)
 endif()
-list(APPEND LIBIGL_ALL_MODULES igl_common)
-list(APPEND LIBIGL_INSTALL_HEADERS igl)
 
 # Transitive C++11 flags
 include(CXXFeatures)
@@ -110,11 +110,6 @@ else()
     $<BUILD_INTERFACE:${LIBIGL_EXTERNAL}/eigen>
     $<INSTALL_INTERFACE:include>
   )
-  # need to install eigen headers
-  install(
-    DIRECTORY ${LIBIGL_EXTERNAL}/eigen/Eigen
-    DESTINATION include
-  )
 endif()
 
 # C++11 Thread library
@@ -152,6 +147,8 @@ function(compile_igl_module module_dir)
   # Alias target because it looks nicer
   message(STATUS "Creating target: igl::${module_name} (${module_libname})")
   add_library(igl::${module_name} ALIAS ${module_libname})
+  # Export as igl::${module_name}
+  set_property(TARGET ${module_libname} PROPERTY EXPORT_NAME ${module_name})
 endfunction()
 
 
@@ -165,7 +162,6 @@ if(LIBIGL_USE_STATIC_LIBRARY)
     "${LIBIGL_SOURCE_DIR}/igl/copyleft/*.cpp")
 endif()
 compile_igl_module("core" ${SOURCES_IGL})
-list(APPEND LIBIGL_ALL_MODULES igl)
 
 ################################################################################
 ## Compile the AntTweakBar part ###
@@ -176,8 +172,6 @@ if(LIBIGL_WITH_ANTTWEAKBAR)
   endif()
   compile_igl_module("anttweakbar")
   target_link_libraries(igl_anttweakbar ${IGL_SCOPE} AntTweakBar)
-  list(APPEND LIBIGL_ALL_MODULES anttweakbar)
-  list(APPEND LIBIGL_INSTALL_HEADERS igl/anttweakbar)
 endif()
 
 ################################################################################
@@ -198,8 +192,6 @@ if(LIBIGL_WITH_CGAL)
     find_package(Boost 1.48 REQUIRED thread system)
     target_include_directories(igl_cgal ${IGL_SCOPE} ${CGAL_INCLUDE_DIRS} ${Boost_INCLUDE_DIRS})
     target_link_libraries(igl_cgal ${IGL_SCOPE} CGAL::CGAL CGAL::CGAL_Core ${Boost_LIBRARIES})
-    list(APPEND LIBIGL_ALL_MODULES igl_cgal)
-    list(APPEND LIBIGL_INSTALL_HEADERS igl/copyleft/cgal)
   else()
     set(LIBIGL_WITH_CGAL OFF CACHE BOOL "" FORCE)
   endif()
@@ -241,9 +233,6 @@ if(LIBIGL_WITH_COMISO)
     add_subdirectory("${LIBIGL_EXTERNAL}/CoMISo" CoMISo)
   endif()
   target_link_libraries(igl_comiso ${IGL_SCOPE} CoMISo)
-  # CoMISo does not get exported, so skip for now
-  # list(APPEND LIBIGL_ALL_MODULES igl_comiso)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/copyleft/comiso)
 endif()
 
 ################################################################################
@@ -259,8 +248,6 @@ if(LIBIGL_WITH_CORK)
   target_include_directories(igl_cork ${IGL_SCOPE} cork)
   target_include_directories(igl_cork ${IGL_SCOPE} "${CORK_DIR}/src")
   target_link_libraries(igl_cork ${IGL_SCOPE} cork)
-  list(APPEND LIBIGL_ALL_MODULES igl_cork)
-  list(APPEND LIBIGL_INSTALL_HEADERS igl/copyleft/cork)
 endif()
 
 ################################################################################
@@ -299,8 +286,6 @@ if(LIBIGL_WITH_EMBREE)
   if(NOT MSVC)
     target_compile_definitions(igl_embree ${IGL_SCOPE} -DENABLE_STATIC_LIB)
   endif()
-  # list(APPEND LIBIGL_ALL_MODULES igl_embree)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/embree)
 endif()
 
 ################################################################################
@@ -313,9 +298,6 @@ if(LIBIGL_WITH_LIM)
   compile_igl_module("lim")
   target_link_libraries(igl_lim ${IGL_SCOPE} lim)
   target_include_directories(igl_lim ${IGL_SCOPE} ${LIM_DIR})
-  # lim does not get exported, so skip for now
-  # list(APPEND LIBIGL_ALL_MODULES igl_lim)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/lim)
 endif()
 
 ################################################################################
@@ -325,8 +307,6 @@ if(LIBIGL_WITH_MATLAB)
   compile_igl_module("matlab")
   target_link_libraries(igl_matlab ${IGL_SCOPE} ${Matlab_LIBRARIES})
   target_include_directories(igl_matlab ${IGL_SCOPE} ${Matlab_INCLUDE_DIRS})
-  list(APPEND LIBIGL_ALL_MODULES igl_matlab)
-  list(APPEND LIBIGL_INSTALL_HEADERS igl/matlab)
 endif()
 
 ################################################################################
@@ -337,8 +317,6 @@ if(LIBIGL_WITH_MOSEK)
   target_link_libraries(igl_mosek ${IGL_SCOPE} ${MOSEK_LIBRARIES})
   target_include_directories(igl_mosek ${IGL_SCOPE} ${MOSEK_INCLUDE_DIRS})
   target_compile_definitions(igl_mosek ${IGL_SCOPE} -DLIBIGL_WITH_MOSEK)
-  list(APPEND LIBIGL_ALL_MODULES igl_mosek)
-  list(APPEND LIBIGL_INSTALL_HEADERS igl/mosek)
 endif()
 
 ################################################################################
@@ -356,10 +334,6 @@ if(LIBIGL_WITH_OPENGL)
     add_subdirectory(${LIBIGL_EXTERNAL}/glad glad)
   endif()
   target_link_libraries(igl_opengl ${IGL_SCOPE} glad)
-  # glad does not get exported, so skip for now
-  # list(APPEND LIBIGL_ALL_MODULES igl_opengl)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/opengl)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/opengl2)
 endif()
 
 ################################################################################
@@ -377,9 +351,6 @@ if(LIBIGL_WITH_OPENGL_GLFW)
       add_subdirectory(${LIBIGL_EXTERNAL}/glfw glfw)
     endif()
     target_link_libraries(igl_opengl_glfw ${IGL_SCOPE} igl_opengl glfw)
-    # glfw does not get exported, so skip for now
-    # list(APPEND LIBIGL_ALL_MODULES igl_opengl_glfw)
-    # list(APPEND LIBIGL_INSTALL_HEADERS igl/opengl/glfw)
   endif()
 endif()
 
@@ -394,8 +365,6 @@ if(LIBIGL_WITH_OPENGL_GLFW_IMGUI)
       add_subdirectory(${LIBIGL_EXTERNAL}/imgui imgui)
     endif()
     target_link_libraries(igl_opengl_glfw_imgui ${IGL_SCOPE} igl_opengl_glfw imgui)
-    # list(APPEND LIBIGL_ALL_MODULES igl_opengl_glfw_imgui)
-    # list(APPEND LIBIGL_INSTALL_HEADERS igl/opengl/glfw/imgui)
   endif()
 endif()
 
@@ -411,9 +380,6 @@ if(LIBIGL_WITH_PNG)
     endif()
     compile_igl_module("png" "")
     target_link_libraries(igl_png ${IGL_SCOPE} igl_stb_image igl_opengl)
-    # igl_std_image does not get exported, so skip for now
-    # list(APPEND LIBIGL_ALL_MODULES igl_png)
-    # list(APPEND LIBIGL_INSTALL_HEADERS igl/png)
   endif()
 endif()
 
@@ -427,9 +393,6 @@ if(LIBIGL_WITH_TETGEN)
   compile_igl_module("tetgen")
   target_link_libraries(igl_tetgen ${IGL_SCOPE} tetgen)
   target_include_directories(igl_tetgen ${IGL_SCOPE} ${TETGEN_DIR})
-  # tetget does not get exported, so skip for now
-  # list(APPEND LIBIGL_ALL_MODULES igl_tetgen)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/copyleft/tetgen)
 endif()
 
 ################################################################################
@@ -442,9 +405,6 @@ if(LIBIGL_WITH_TRIANGLE)
   compile_igl_module("triangle")
   target_link_libraries(igl_triangle ${IGL_SCOPE} triangle)
   target_include_directories(igl_triangle ${IGL_SCOPE} ${TRIANGLE_DIR})
-  # triangle does not get exported, so skip for now
-  # list(APPEND LIBIGL_ALL_MODULES igl_triangle)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/triangle)
 endif()
 
 ################################################################################
@@ -461,45 +421,85 @@ if(LIBIGL_WITH_XML)
   compile_igl_module("xml")
   target_link_libraries(igl_xml ${IGL_SCOPE} tinyxml2)
   target_include_directories(igl_xml ${IGL_SCOPE} ${TINYXML2_DIR})
-  # tinyxml2 does not get exported, so skip for now
-  # list(APPEND LIBIGL_ALL_MODULES igl_xml)
-  # list(APPEND LIBIGL_INSTALL_HEADERS igl/xml)
 endif()
 
 ################################################################################
 ### Install and export all modules
 
+function(install_dir_files dir_name)
+  if (dir_name STREQUAL "core")
+    set(subpath "")
+  else()
+    set(subpath "/${dir_name}")
+  endif()
+
+  file(GLOB public_headers
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/igl${subpath}/*.h
+  )
+
+  set(files_to_install ${public_headers})
+
+  if(NOT LIBIGL_USE_STATIC_LIBRARY)
+    file(GLOB public_sources
+      ${CMAKE_CURRENT_SOURCE_DIR}/include/igl${subpath}/*.cpp
+    )
+  endif()
+  list(APPEND files_to_install ${public_sources})
+
+  install(
+    FILES ${files_to_install}
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/igl${subpath}
+  )
+endfunction()
+
+################################################################################
+
 include(GNUInstallDirs)
+include(CMakePackageConfigHelpers)
 
-install(TARGETS ${LIBIGL_ALL_MODULES} EXPORT igl-export
+# Install and export core library
+install(
+   TARGETS
+     igl
+     igl_common
+   EXPORT igl-export
    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
 )
-
-foreach(HEADERS ${LIBIGL_INSTALL_HEADERS})
-  file(GLOB HEADER_FILES "${CMAKE_CURRENT_SOURCE_DIR}/../include/${HEADERS}/*.h")
-  install(
-    FILES ${HEADER_FILES}
-    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${HEADERS}
-  )
-endforeach(HEADERS)
-
-install(EXPORT igl-export NAMESPACE igl::
-  DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/igl/cmake
+export(
+  TARGETS
+    igl
+    igl_common
+  NAMESPACE igl::
+  FILE libigl-export.cmake
 )
-export(TARGETS ${LIBIGL_ALL_MODULES} NAMESPACE igl:: FILE igl-export.cmake)
 
-# Write and install package configuration file
-include(CMakePackageConfigHelpers)
+# Install headers for core library
+install_dir_files(core)
+install_dir_files(copyleft)
+
+# Write package configuration file
 configure_package_config_file(
   ${CMAKE_CURRENT_LIST_DIR}/libigl-config.cmake.in
-  ${CMAKE_CURRENT_BINARY_DIR}/libigl-config.cmake
-  INSTALL_DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/igl/cmake
+  ${CMAKE_BINARY_DIR}/libigl-config.cmake
+  INSTALL_DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/libigl/cmake
+)
+install(
+  FILES
+    ${CMAKE_BINARY_DIR}/libigl-config.cmake
+  DESTINATION
+    ${CMAKE_INSTALL_DATADIR}/libigl/cmake
 )
-install(FILES
-  ${CMAKE_CURRENT_BINARY_DIR}/libigl-config.cmake
-  DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/igl/cmake
+
+# Write export file
+export(EXPORT igl-export
+  FILE "${CMAKE_BINARY_DIR}/libigl-export.cmake"
+  NAMESPACE igl::
 )
+install(EXPORT igl-export DESTINATION ${CMAKE_INSTALL_DATADIR}/libigl/cmake FILE libigl-export.cmake)
+
+
+export(PACKAGE libigl)