Add options to compile only PG module/frontend

It makes it easier to install Nominatim server and PostgresSQL on
separate servers or use separate docker images for them.

CMakeLists.txt

@@ -35,9 +35,11 @@ add_definitions(-DNOMINATIM_VERSION="${NOMINATIM_VERSION}")
 
 set(BUILD_TESTS off CACHE BOOL "Build test suite" FORCE)
 set(WITH_LUA off CACHE BOOL "Build with lua support" FORCE)
-set(ONLY_DOCS off CACHE BOOL "Build documentation only")
+set(BUILD_DOCS on CACHE BOOL "Build documentation")
+set(BUILD_SERVER on CACHE BOOL "Build API server")
+set(BUILD_MODULE on CACHE BOOL "Build module")
 
-if (NOT ONLY_DOCS)
+if (BUILD_SERVER)
     if (NOT EXISTS "${CMAKE_SOURCE_DIR}/osm2pgsql/CMakeLists.txt")
         message(FATAL_ERROR "The osm2pgsql directory is empty.\
         Did you forget to check out Nominatim recursively?\
@@ -45,14 +47,6 @@ if (NOT ONLY_DOCS)
     endif()
     add_subdirectory(osm2pgsql)
 
-    find_package(Threads REQUIRED)
-
-    unset(PostgreSQL_TYPE_INCLUDE_DIR CACHE)
-    set(PostgreSQL_TYPE_INCLUDE_DIR "/usr/include/")
-    find_package(PostgreSQL REQUIRED)
-    include_directories(${PostgreSQL_INCLUDE_DIRS})
-    link_directories(${PostgreSQL_LIBRARY_DIRS})
-
     find_program(PYOSMIUM pyosmium-get-changes)
     if (NOT EXISTS "${PYOSMIUM}")
         set(PYOSMIUM_PATH "")
@@ -63,15 +57,6 @@ if (NOT ONLY_DOCS)
     endif()
 
 
-    find_program(PG_CONFIG pg_config)
-    execute_process(COMMAND ${PG_CONFIG} --pgxs
-                    OUTPUT_VARIABLE PGXS
-                    OUTPUT_STRIP_TRAILING_WHITESPACE)
-
-    if (NOT EXISTS "${PGXS}")
-        message(FATAL_ERROR "Postgresql server package not found.")
-    endif()
-
     # Setting PHP binary variable as to command line (prevailing) or auto detect
     if (NOT PHP_BIN)
          find_program (PHP_BIN php)
@@ -89,6 +74,7 @@ endif()
 #
 #-----------------------------------------------------------------------------
 
+if (BUILD_SERVER)
    set(WEBSITESCRIPTS
        website/deletable.php
        website/details.php
@@ -131,7 +117,7 @@ foreach (wp ${WEBPATHS})
            COMMAND ln -sf ${PROJECT_SOURCE_DIR}/website/${wp} ${PROJECT_BINARY_DIR}/website/
        )
    endforeach()
-
+endif()
 
 #-----------------------------------------------------------------------------
 #
@@ -139,7 +125,7 @@ endforeach()
 #
 #-----------------------------------------------------------------------------
 
-if (NOT ONLY_DOCS)
+if (BUILD_TESTS)
     include(CTest)
 
     set(TEST_BDD db osm2pgsql api)
@@ -159,10 +145,12 @@ endif()
 
 #-----------------------------------------------------------------------------
 
-if (NOT ONLY_DOCS)
+if (BUILD_MODULE)
     add_subdirectory(module)
     add_subdirectory(nominatim)
 endif()
+if (BUILD_DOCS)
    add_subdirectory(docs)
+endif()
 
 #-----------------------------------------------------------------------------

module/CMakeLists.txt

@@ -1,4 +1,13 @@
 # just use the pgxs makefile
+find_program(PG_CONFIG pg_config)
+execute_process(COMMAND ${PG_CONFIG} --pgxs
+            OUTPUT_VARIABLE PGXS
+            OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+if (NOT EXISTS "${PGXS}")
+message(FATAL_ERROR "Postgresql server package not found.")
+endif()
+
 ADD_CUSTOM_COMMAND( OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/dummy
         COMMAND PGXS=${PGXS} PG_CONFIG=${PG_CONFIG} MODSRCDIR=${CMAKE_CURRENT_SOURCE_DIR} $(MAKE) -f ${CMAKE_CURRENT_SOURCE_DIR}/Makefile
         COMMENT "Running external makefile ${PGXS}"

nominatim/CMakeLists.txt

@@ -7,6 +7,7 @@ CHECK_SYMBOL_EXISTS(bswap32 "sys/endian.h" HAVE_SYS_ENDIAN)
 find_package(ZLIB REQUIRED)
 find_package(BZip2 REQUIRED)
 find_package(LibXml2 REQUIRED)
+find_package(Threads REQUIRED)
 
 unset(PostgreSQL_TYPE_INCLUDE_DIR CACHE)
 set(PostgreSQL_TYPE_INCLUDE_DIR "/usr/include/")
@@ -14,7 +15,6 @@ find_package(PostgreSQL REQUIRED)
 include_directories(${PostgreSQL_INCLUDE_DIRS})
 link_directories(${PostgreSQL_LIBRARY_DIRS})
 
-
 include_directories(${LIBXML2_INCLUDE_DIR})
 
 target_compile_definitions(nominatim