WASM Server Build Support

freeciv/apply_wasm_server_patches.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+
+declare -a PATCHLIST=(
+  "create_virtual_sockets_interface"
+  "disable_curl"
+  "switch_netintf_to_virtual"
+  "switch_sernet_to_virtual"
+  "fix_missing_type_declaration"
+  "add_breaks_into_loops_for_js"
+  "update-cross-file"
+  "make_emsbuild_for_server"
+  "update-meson-build"
+)
+
+apply_patch() {
+  echo "*** Applying $1.patch ***"
+  if ! patch -u -p1 -d freeciv < patches-wasm-server/$1.patch ; then
+    echo "APPLYING PATCH $1.patch FAILED!"
+    return 1
+  fi
+  echo "=== $1.patch applied ==="
+}
+
+for patch in "${PATCHLIST[@]}"
+do
+  if test "${patch}.patch" = "$APPLY_UNTIL" ; then
+    echo "$patch not applied as requested to stop"
+    break
+  fi
+  if ! apply_patch $patch ; then
+    echo "Patching failed ($patch.patch)" >&2
+    exit 1
+  fi
+done

freeciv/build_jansson_lib.sh

@@ -0,0 +1,14 @@
+# Build Jansson library for emscripten
+if ! test -f "freeciv/jansson/jansson_private_config.h.in" ; then
+  echo "Jansson source not found in \"${JANSSON_ROOT}\"" >&2
+  exit 1
+fi
+cd freeciv/jansson || exit 1
+export CFLAGS="-pthread"
+export CXXFLAGS="-pthread"
+export LDFLAGS="-pthread"
+emconfigure ./configure
+emmake make
+
+cd ../.. || exit 1
+

freeciv/dl_jansson_lib.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env -S bash -e
+# Downloads and places the Jansson library source code in jansson/
+# Remove old version
+rm -Rf jansson
+# Download Jansson source code
+wget https://github.com/akheron/jansson/releases/download/v2.15.0/jansson-2.15.0.tar.gz
+tar -xzf jansson-2.15.0.tar.gz
+mv jansson-2.15.0 freeciv/jansson
+rm jansson-2.15.0.tar.gz

freeciv/patches-wasm-server/add_breaks_into_loops_for_js.patch

@@ -0,0 +1,74 @@
+diff -ruN freeciv-base/server/srv_main.c freeciv/server/srv_main.c
+--- freeciv-base/server/srv_main.c	2026-02-03 10:52:54.223187745 +1000
++++ freeciv/server/srv_main.c	2026-02-04 16:02:16.111647221 +1000
+@@ -41,6 +41,9 @@
+ #ifdef HAVE_UNISTD_H
+ #include <unistd.h>
+ #endif
++#ifdef __EMSCRIPTEN__
++#include <emscripten.h>
++#endif
+
+ /* dependencies/lua */
+ #include "lua.h" /* lua_Integer */
+@@ -2064,6 +2067,9 @@
+   int retries = 0;
+
+   while (identity_number_is_used(increment_identity_number())) {
++    #ifdef __EMSCRIPTEN__
++    emscripten_sleep(0);
++    #endif
+     /* Try again */
+     if (++retries >= IDENTITY_NUMBER_SIZE) {
+       /* Always fails. */
+@@ -2925,6 +2931,9 @@
+
+   fc_assert(S_S_RUNNING == server_state());
+   while (S_S_RUNNING == server_state()) {
++    #ifdef __EMSCRIPTEN__
++    emscripten_sleep(0);
++    #endif
+     /* The beginning of a turn.
+      *
+      * We have to initialize data as well as do some actions.  However when
+@@ -2998,6 +3007,9 @@
+       }
+
+       while (server_sniff_all_input() == S_E_OTHERWISE) {
++        #ifdef __EMSCRIPTEN__
++        emscripten_sleep(0);
++        #endif
+         /* Nothing */
+       }
+
+@@ -3583,6 +3595,9 @@
+
+   /* Run server loop */
+   do {
++    #ifdef __EMSCRIPTEN__
++    emscripten_sleep(0);
++    #endif
+     set_server_state(S_S_INITIAL);
+
+     /* Load a script file. */
+@@ -3600,6 +3615,9 @@
+                srvarg.port);
+     /* Remain in S_S_INITIAL until all players are ready. */
+     while (S_E_FORCE_END_OF_SNIFF != server_sniff_all_input()) {
++      #ifdef __EMSCRIPTEN__
++      emscripten_sleep(0);
++      #endif
+       /* When force_end_of_sniff is used in pregame, it means that the server
+        * is ready to start (usually set within start_game()). */
+     }
+@@ -3614,6 +3632,9 @@
+
+     /* Remain in S_S_OVER until players log out */
+     while (conn_list_size(game.est_connections) > 0) {
++      #ifdef __EMSCRIPTEN__
++      emscripten_sleep(0);
++      #endif
+       server_sniff_all_input();
+     }
+
+