add PythonSupport; change Doc build control flow

* change in Build_Documentation control flow
* don’t Build_Documentation of deps if EXCLUDE_FROM_ALL
* export new APP4TRIQS_WITH_PYTHON_SUPPORT variable in config.cmake

CMakeLists.txt

@@ -70,6 +70,15 @@ if(NOT IS_SUBPROJECT)
   message(STATUS "-------- BUILD-TYPE: ${CMAKE_BUILD_TYPE} --------")
 endif()
 
+# Python Support
+option(PythonSupport "Build with Python support" ON)
+if(PythonSupport AND NOT TRIQS_WITH_PYTHON_SUPPORT)
+  message(FATAL_ERROR "TRIQS was installed without Python support. Cannot build the Python Interface. Disable the build with -DPythonSupport=OFF")
+endif()
+
+# Documentation
+option(Build_Documentation "Build documentation" OFF)
+
 # Testing
 option(Build_Tests "Build tests" ON)
 if(Build_Tests)
@@ -116,28 +125,19 @@ if(Build_Tests)
   add_subdirectory(test)
 endif()
 
-if(TRIQS_WITH_PYTHON_SUPPORT)
-  # Python interface
+# Python
+if(PythonSupport)
   add_subdirectory(python/app4triqs)
+endif()
 
-  # Build the documentation
-  option(Build_Documentation "Build documentation" OFF)
-  if(Build_Documentation AND NOT IS_SUBPROJECT)
-    if(NOT TRIQS_WITH_DOCUMENTATION)
-      message(WARNING "TRIQS was installed without documentation! Cannot build documentation.")
-    else()
-      message(STATUS "Documentation Build enabled")
+# Docs
+if(Build_Documentation)
   add_subdirectory(doc)
-    endif()
-  endif()
-else()
-  message(WARNING "TRIQS was installed without Python support. Cannot build the Python Interface and Documentation.")
 endif()
 
 # Additional configuration files
 add_subdirectory(share)
 
-
 # #############
 # Debian Package
 
@@ -156,4 +156,3 @@ if(BUILD_DEBIAN_PACKAGE AND NOT IS_SUBPROJECT)
   set(CPACK_DEBIAN_PACKAGE_GENERATE_SHLIBS ON)
   include(CPack)
 endif()
-

deps/CMakeLists.txt

@@ -54,10 +54,12 @@ external_dependency(GTest
   EXCLUDE_FROM_ALL
 )
 
-# -- Cpp2Py --
-external_dependency(Cpp2Py
+if(PythonSupport OR Build_Documentation)
+  # -- Cpp2Py --
+  external_dependency(Cpp2Py
     GIT_REPO https://github.com/TRIQS/cpp2py
     VERSION 2.0
     GIT_TAG master
     EXCLUDE_FROM_ALL
-)
+  )
+endif()

deps/external_dependency.cmake

@@ -46,6 +46,7 @@ function(external_dependency)
   if(ARG_EXCLUDE_FROM_ALL)
     set(subdir_opts EXCLUDE_FROM_ALL)
     set(Build_Tests OFF)
+    set(Build_Documentation OFF)
   endif()
   if(IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${ARGV0})
     message(STATUS "Found sources for dependency ${ARGV0} at ${CMAKE_CURRENT_SOURCE_DIR}/${ARGV0}")

share/CMakeLists.txt

@@ -2,6 +2,12 @@ add_subdirectory(cmake)
 
 if(NOT CMAKE_INSTALL_PREFIX STREQUAL TRIQS_ROOT AND NOT IS_SUBPROJECT)
 
+  if(PythonSupport)
+    set(EXPORT_PYTHON_PATH "export PYTHONPATH=${CMAKE_INSTALL_PREFIX}/${CPP2PY_PYTHON_LIB_DEST_ROOT}:$PYTHONPATH")
+    set(MODFILE_PYTHON_PATH "prepend-path    PYTHONPATH          $root/${CPP2PY_PYTHON_LIB_DEST_ROOT}")
+
+  endif()
+
   configure_file(app4triqs.modulefile.in app4triqs.modulefile @ONLY)
   configure_file(app4triqsvars.sh.in app4triqsvars.sh @ONLY)
 

share/app4triqs.modulefile.in

@@ -35,5 +35,5 @@ prepend-path    PATH                $root/bin
 prepend-path    CPLUS_INCLUDE_PATH  $root/include
 prepend-path    LIBRARY_PATH        $root/lib
 prepend-path    LD_LIBRARY_PATH     $root/lib
-prepend-path    PYTHONPATH          $root/@TRIQS_PYTHON_LIB_DEST_ROOT@
 prepend-path    CMAKE_PREFIX_PATH   $root/lib/cmake/app4triqs
+@MODFILE_PYTHON_PATH@

share/app4triqsvars.sh.in

@@ -6,5 +6,5 @@ export CPLUS_INCLUDE_PATH=@CMAKE_INSTALL_PREFIX@/include:$CPLUS_INCLUDE_PATH
 export PATH=@CMAKE_INSTALL_PREFIX@/bin:$PATH
 export LIBRARY_PATH=@CMAKE_INSTALL_PREFIX@/lib:$LIBRARY_PATH 
 export LD_LIBRARY_PATH=@CMAKE_INSTALL_PREFIX@/lib:$LD_LIBRARY_PATH 
-export PYTHONPATH=@CMAKE_INSTALL_PREFIX@/@CPP2PY_PYTHON_LIB_DEST_ROOT@:$PYTHONPATH
 export CMAKE_PREFIX_PATH=@CMAKE_INSTALL_PREFIX@:$CMAKE_PREFIX_PATH
+@EXPORT_PYTHON_PATH@

share/cmake/app4triqs-config.cmake.in

@@ -25,4 +25,7 @@ message(STATUS "Found app4triqs-config.cmake with version @PROJECT_VERSION@, has
 # Was the Project built with Documentation?
 set(APP4TRIQS_WITH_DOCUMENTATION @Build_Documentation@)
 
+# Was the Project built with PythonSupport?
+set(APP4TRIQS_WITH_PYTHON_SUPPORT @PythonSupport@)
+
 endif()

test/CMakeLists.txt

@@ -1,5 +1,5 @@
 add_subdirectory(c++)
 
-if(${TRIQS_WITH_PYTHON_SUPPORT})
+if(PythonSupport)
  add_subdirectory(python)
 endif()