Ensure that the choice of compiler and target is passed to sub-projects.

CMakeLists.txt

@@ -264,6 +264,7 @@ endif()
 
 if(ENABLE_WEBRTC)
         include(FetchContent)
+        include(NetdataFetchContentExtra)
 
         # ignore debhelper
         set(FETCHCONTENT_FULLY_DISCONNECTED Off)
@@ -277,6 +278,7 @@ if(ENABLE_WEBRTC)
         FetchContent_Declare(libdatachannel
             GIT_REPOSITORY https://github.com/paullouisageneau/libdatachannel.git
             GIT_TAG v0.20.1
+            CMAKE_ARGS ${NETDATA_PROPAGATE_TOOLCHAIN_ARGS}
         )
         FetchContent_MakeAvailable(libdatachannel)
 endif()

packaging/cmake/Modules/NetdataFetchContentExtra.cmake

@@ -25,3 +25,17 @@ macro(FetchContent_MakeAvailable_NoInstall name)
         add_subdirectory(${${name}_SOURCE_DIR} ${${name}_BINARY_DIR} EXCLUDE_FROM_ALL)
     endif()
 endmacro()
+
+# NETDATA_PROPAGATE_TOOLCHAIN_ARGS
+#
+# Defines a set of CMake flags to be passed to CMAKE_ARGS for
+# FetchContent_Declare and ExternalProject_Add to ensure that toolchain
+# configuration propagates correctly to sub-projects.
+#
+# This needs to be explicitly included for any sub-project that needs
+# to be built for the target system.
+set(NETDATA_PROPAGATE_TOOLCHAIN_ARGS
+    "-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+     -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+     $<$<BOOL:${CMAKE_C_COMPILER_TARGET}>:-DCMAKE_C_COMPILER_TARGET=${CMAKE_C_COMPILER_TARGET}
+     $<$<BOOL:${CMAKE_CXX_COMPILER_TARGET}>:-DCMAKE_CXX_COMPILER_TARGET=${CMAKE_CXX_COMPILER_TARGET}")

packaging/cmake/Modules/NetdataJSONC.cmake

@@ -40,6 +40,7 @@ function(netdata_bundle_jsonc)
         FetchContent_Declare(json-c
                 GIT_REPOSITORY https://github.com/json-c/json-c
                 GIT_TAG b4c371fa0cbc4dcbaccc359ce9e957a22988fb34 # json-c-0.17-20230812
+                CMAKE_ARGS ${NETDATA_CMAKE_PROPAGATE_TOOLCHAIN_ARGS}
         )
 
         FetchContent_MakeAvailable_NoInstall(json-c)

packaging/cmake/Modules/NetdataProtobuf.cmake

@@ -33,6 +33,7 @@ function(netdata_bundle_protobuf)
                 FetchContent_Declare(absl
                         GIT_REPOSITORY https://github.com/abseil/abseil-cpp
                         GIT_TAG ${ABSL_TAG}
+                        CMAKE_ARGS ${NETDATA_CMAKE_PROPAGATE_TOOLCHAIN_ARGS}
                 )
                 FetchContent_MakeAvailable_NoInstall(absl)
                 message(STATUS "Finished preparing bundled Abseil")
@@ -47,6 +48,7 @@ function(netdata_bundle_protobuf)
         FetchContent_Declare(protobuf
                 GIT_REPOSITORY https://github.com/protocolbuffers/protobuf.git
                 GIT_TAG ${PROTOBUF_TAG}
+                CMAKE_ARGS ${NETDATA_CMAKE_PROPAGATE_TOOLCHAIN_ARGS}
         )
         FetchContent_MakeAvailable_NoInstall(protobuf)
         message(STATUS "Finished preparing bundled Protobuf.")

packaging/cmake/Modules/NetdataSentry.cmake

@@ -28,6 +28,7 @@ function(netdata_bundle_sentry)
                 sentry
                 GIT_REPOSITORY https://github.com/getsentry/sentry-native.git
                 GIT_TAG c97bcc63fa89ae557cef9c9b6e3acb11a72ff97d # v0.6.6
+                CMAKE_ARGS ${NETDATA_CMAKE_PROPAGATE_TOOLCHAIN_ARGS}
         )
         FetchContent_MakeAvailable(sentry)
 endfunction()

packaging/cmake/Modules/NetdataYAML.cmake

@@ -23,6 +23,7 @@ function(netdata_bundle_libyaml)
         FetchContent_Declare(yaml
                 GIT_REPOSITORY https://github.com/yaml/libyaml
                 GIT_TAG 2c891fc7a770e8ba2fec34fc6b545c672beb37e6 # v0.2.5
+                CMAKE_ARGS ${NETDATA_CMAKE_PROPAGATE_TOOLCHAIN_ARGS}
         )
 
         FetchContent_MakeAvailable_NoInstall(yaml)