cmake: allow disabling the web layer via BUILD_MODULE_WEBServer

CMakeLists.txt

@@ -210,6 +210,18 @@ include(${BUILD_CMAKE_FOLDER}/GoogleProtoBuf.cmake)
 # functions.cmake so NSCP_CREATE_TEST can honour it.
 option(NSCP_BUILD_TESTS "Build the unit tests (requires Google Test)" ON)
 
+# WEBServer's per-module flag (the generic BUILD_MODULE_<name> option that
+# LOAD_SECTIONS declares for every module) is consumed *early* here — by the
+# HTTP backend selector in dependencies.cmake and by the libs/* glob that adds
+# its Beast/mongoose backend library (libs/mongoose-cpp -> nscp_mongoose) — long
+# before LOAD_SECTIONS would normally declare it. Declare it up front so those
+# early consumers see it (and its ON default); LOAD_SECTIONS' later option()
+# call for it is then a no-op. With -DBUILD_MODULE_WEBServer=OFF this turns off
+# the module, its HTTP backend library, the backend selector and the mongoose
+# wrapper test together — a build with no web/HTTP server at all (e.g. a
+# stripped-down agent package).
+option(BUILD_MODULE_WEBServer "Build module WEBServer" ON)
+
 include(${BUILD_CMAKE_FOLDER}/functions.cmake)
 
 # ##############################################################################
@@ -1020,6 +1032,8 @@ foreach(CURRENT_LIB ${ALL_LIB_PROJECTS})
         OR CURRENT_LIB_NAME
             STREQUAL
             "dotnet-plugin-api"
+        OR (NOT BUILD_MODULE_WEBServer
+            AND CURRENT_LIB_NAME STREQUAL "mongoose-cpp")
     )
         message(
             STATUS

build/cmake/dependencies.cmake

@@ -76,6 +76,12 @@ set(NSCP_ZIP_BACKEND
 # variable of the same name — silently reverting build.cmake's
 # `SET(NSCP_WEB_BACKEND "beast")` back to mongoose. That broke the Linux
 # (beast) package builds, which opt in via build.cmake rather than -D.
+#
+# The HTTP backend only matters when the WEBServer module is built; skip the
+# whole selector otherwise so a no-web build (-DBUILD_MODULE_WEBServer=OFF)
+# needs no backend at all — neither the vendored mongoose source nor
+# Beast/OpenSSL — and does not abort here.
+if(BUILD_MODULE_WEBServer)
 if(NOT DEFINED NSCP_WEB_BACKEND)
     set(NSCP_WEB_BACKEND "mongoose")
 endif()
@@ -121,6 +127,7 @@ elseif(NSCP_WEB_BACKEND STREQUAL "beast")
 else()
     message(FATAL_ERROR "Unknown NSCP_WEB_BACKEND='${NSCP_WEB_BACKEND}' (expected mongoose | beast)")
 endif()
+endif() # BUILD_MODULE_WEBServer (HTTP backend selector)
 # CMP0167 (CMake 3.30+) removes the bundled FindBoost module in favour of
 # upstream BoostConfig.
 if(POLICY CMP0167)

tests/CMakeLists.txt

@@ -453,6 +453,10 @@ NSCP_CREATE_TEST(
         ${CMAKE_SOURCE_DIR}/modules/IcingaClient
 )
 
+# The mongoose wrapper test links nscp_mongoose, which only exists when the
+# WEBServer module / HTTP backend is built. Skip it otherwise so the missing
+# target does not break configuration.
+if(BUILD_MODULE_WEBServer)
 set(MONGOOSE_CPP_DIR ${CMAKE_SOURCE_DIR}/libs/mongoose-cpp)
 
 # Shared (backend-independent) test sources.
@@ -565,6 +569,7 @@ if(WIN32)
         COMMAND_EXPAND_LISTS
     )
 endif()
+endif() # BUILD_MODULE_WEBServer (mongoose_wrapper_test)
 
 set(SETTINGS_INI_TEST_SOURCES
     ${NSCP_INCLUDEDIR}/settings/impl/settings_ini_test.cpp