Remove: ENABLE_NETWORK switch

This switch has been a pain for years. Often disabling broke
compilation, as no developer compiles OpenTTD without, neither do
any of our official binaries.

Additionaly, it has grown so hugely in our codebase, that it
clearly shows that the current solution was a poor one. 350+
instances of "#ifdef ENABLE_NETWORK" were in the code, of which
only ~30 in the networking code itself. The rest were all around
the code to do the right thing, from GUI to NewGRF.

A more proper solution would be to stub all the functions, and
make sure the rest of the code can simply assume network is
available. This was also partially done, and most variables were
correct if networking was disabled. Despite that, often the #ifdefs
were still used.

With the recent removal of DOS, there is also no platform anymore
which we support where networking isn't working out-of-the-box.

All in all, it is time to remove the ENABLE_NETWORK switch. No
replacement is planned, but if you feel we really need this option,
we welcome any Pull Request which implements this in a way that
doesn't crawl through the code like this diff shows we used to.

2 files changed, 1 insertions, 47 deletions

diff --git a/src/table/gameopt_settings.ini b/src/table/gameopt_settings.ini
index 624d475c3..29d6a3177 100644
--- a/src/table/gameopt_settings.ini
+++ b/src/table/gameopt_settings.ini
@@ -21,9 +21,7 @@ static const char *_climates = "temperate|arctic|tropic|toyland";
 static const char *_autosave_interval = "off|monthly|quarterly|half year|yearly";
 static const char *_roadsides = "left|right";
 static const char *_savegame_date = "long|short|iso";
-#ifdef ENABLE_NETWORK
 static const char *_server_langs = "ANY|ENGLISH|GERMAN|FRENCH|BRAZILIAN|BULGARIAN|CHINESE|CZECH|DANISH|DUTCH|ESPERANTO|FINNISH|HUNGARIAN|ICELANDIC|ITALIAN|JAPANESE|KOREAN|LITHUANIAN|NORWEGIAN|POLISH|PORTUGUESE|ROMANIAN|RUSSIAN|SLOVAK|SLOVENIAN|SPANISH|SWEDISH|TURKISH|UKRAINIAN|AFRIKAANS|CROATIAN|CATALAN|ESTONIAN|GALICIAN|GREEK|LATVIAN";
-#endif /* ENABLE_NETWORK */
 static const char *_osk_activation = "disabled|double|single|immediately";
 static const char *_settings_profiles = "easy|medium|hard";
 static const char *_news_display = "off|summarized|full";
diff --git a/src/table/settings.ini b/src/table/settings.ini
index 7ab00d5a3..e7b625e4b 100644
--- a/src/table/settings.ini
+++ b/src/table/settings.ini
@@ -44,12 +44,11 @@ static bool ZoomMinMaxChanged(int32 p1);
 static bool MaxVehiclesChanged(int32 p1);
 static bool InvalidateShipPathCache(int32 p1);
 
-#ifdef ENABLE_NETWORK
 static bool UpdateClientName(int32 p1);
 static bool UpdateServerPassword(int32 p1);
 static bool UpdateRconPassword(int32 p1);
 static bool UpdateClientConfigValues(int32 p1);
-#endif /* ENABLE_NETWORK */
+
 /* End - Callback Functions for the various settings */
 
 /* Some settings do not need to be synchronised when playing in multiplayer.
@@ -3565,7 +3564,6 @@ strhelp  = STR_CONFIG_SETTING_NEWS_GENERAL_INFORMATION_HELPTEXT
 strval   = STR_CONFIG_SETTING_NEWS_MESSAGES_OFF
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = gui.network_chat_box_width_pct
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3575,7 +3573,6 @@ max      = 100
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = gui.network_chat_box_height
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3585,7 +3582,6 @@ max      = 255
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = gui.network_chat_timeout
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3595,7 +3591,6 @@ max      = 65535
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.sync_freq
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NOT_IN_CONFIG | SLF_NO_NETWORK_SYNC
@@ -3606,7 +3601,6 @@ max      = 100
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.frame_freq
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NOT_IN_CONFIG | SLF_NO_NETWORK_SYNC
@@ -3617,7 +3611,6 @@ max      = 100
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.commands_per_frame
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3628,7 +3621,6 @@ max      = 65535
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_commands_in_queue
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3639,7 +3631,6 @@ max      = 65535
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.bytes_per_frame
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3650,7 +3641,6 @@ max      = 65535
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.bytes_per_frame_burst
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3661,7 +3651,6 @@ max      = 65535
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_init_time
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3672,7 +3661,6 @@ max      = 32000
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_join_time
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3682,7 +3670,6 @@ min      = 0
 max      = 32000
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_download_time
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3692,7 +3679,6 @@ min      = 0
 max      = 32000
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_password_time
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3702,7 +3688,6 @@ min      = 0
 max      = 32000
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_lag_time
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3712,14 +3697,12 @@ min      = 0
 max      = 32000
 
 [SDTC_BOOL]
-ifdef    = ENABLE_NETWORK
 var      = network.pause_on_join
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 guiflags = SGF_NETWORK_ONLY
 def      = true
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.server_port
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3730,7 +3713,6 @@ max      = 65535
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.server_admin_port
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3741,7 +3723,6 @@ max      = 65535
 cat      = SC_EXPERT
 
 [SDTC_BOOL]
-ifdef    = ENABLE_NETWORK
 var      = network.server_admin_chat
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 guiflags = SGF_NETWORK_ONLY
@@ -3749,14 +3730,12 @@ def      = true
 cat      = SC_EXPERT
 
 [SDTC_BOOL]
-ifdef    = ENABLE_NETWORK
 var      = network.server_advertise
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 guiflags = SGF_NETWORK_ONLY
 def      = false
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.lan_internet
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3766,7 +3745,6 @@ min      = 0
 max      = 1
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.client_name
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3774,8 +3752,6 @@ def      = NULL
 proc     = UpdateClientName
 cat      = SC_BASIC
 
-[SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.server_password
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3785,7 +3761,6 @@ proc     = UpdateServerPassword
 cat      = SC_BASIC
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.rcon_password
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3795,7 +3770,6 @@ proc     = UpdateRconPassword
 cat      = SC_BASIC
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.admin_password
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3804,14 +3778,12 @@ def      = NULL
 cat      = SC_BASIC
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.default_company_pass
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 def      = NULL
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.server_name
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3820,14 +3792,12 @@ def      = NULL
 cat      = SC_BASIC
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.connect_to_ip
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 def      = NULL
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.network_id
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3835,14 +3805,12 @@ guiflags = SGF_NETWORK_ONLY
 def      = NULL
 
 [SDTC_BOOL]
-ifdef    = ENABLE_NETWORK
 var      = network.autoclean_companies
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 guiflags = SGF_NETWORK_ONLY
 def      = false
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.autoclean_unprotected
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3852,7 +3820,6 @@ min      = 0
 max      = 240
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.autoclean_protected
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3862,7 +3829,6 @@ min      = 0
 max      = 240
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.autoclean_novehicles
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3872,7 +3838,6 @@ min      = 0
 max      = 240
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_companies
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3884,7 +3849,6 @@ proc     = UpdateClientConfigValues
 cat      = SC_BASIC
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_clients
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3895,7 +3859,6 @@ max      = MAX_CLIENTS
 cat      = SC_BASIC
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.max_spectators
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3907,7 +3870,6 @@ proc     = UpdateClientConfigValues
 cat      = SC_BASIC
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.restart_game_year
 type     = SLE_INT32
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3918,7 +3880,6 @@ max      = MAX_YEAR
 interval = 1
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.min_active_clients
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3928,7 +3889,6 @@ min      = 0
 max      = MAX_CLIENTS
 
 [SDTC_OMANY]
-ifdef    = ENABLE_NETWORK
 var      = network.server_lang
 type     = SLE_UINT8
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3939,7 +3899,6 @@ full     = _server_langs
 cat      = SC_BASIC
 
 [SDTC_BOOL]
-ifdef    = ENABLE_NETWORK
 var      = network.reload_cfg
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 guiflags = SGF_NETWORK_ONLY
@@ -3947,7 +3906,6 @@ def      = false
 cat      = SC_EXPERT
 
 [SDTC_STR]
-ifdef    = ENABLE_NETWORK
 var      = network.last_host
 type     = SLE_STRB
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3955,7 +3913,6 @@ def      = """"
 cat      = SC_EXPERT
 
 [SDTC_VAR]
-ifdef    = ENABLE_NETWORK
 var      = network.last_port
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -3965,7 +3922,6 @@ max      = UINT16_MAX
 cat      = SC_EXPERT
 
 [SDTC_BOOL]
-ifdef    = ENABLE_NETWORK
 var      = network.no_http_content_downloads
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 def      = false