more doc

modules/fc.cmake

@@ -1,3 +1,14 @@
+#.rst:
+#
+# Adds Fortran support.
+# Appends EXTRA_Fortran_FLAGS to CMAKE_Fortran_FLAGS.
+# If environment variable FCFLAGS is set, then these flags are used
+# and no other flags are appended.
+#
+# Defines::
+#
+#   CMAKE_Fortran_MODULE_DIRECTORY (${PROJECT_BINARY_DIR}/include/fortran)
+
 enable_language(Fortran)
 
 set(CMAKE_Fortran_MODULE_DIRECTORY ${PROJECT_BINARY_DIR}/include/fortran)
@@ -13,3 +24,7 @@ endif()
 if(DEFINED EXTRA_Fortran_FLAGS)
     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${EXTRA_Fortran_FLAGS}")
 endif()
+
+if(DEFINED ENV{FCFLAGS})
+    set(CMAKE_Fortran_FLAGS "$ENV{FCFLAGS}")
+endif()