Pick correct toolchain for Linux builds (#6094)

CHANGELOG.md

@@ -7,8 +7,7 @@
 * None
 
 ### Fixed
-* <How to hit and notice issue? what was the impact?> ([#????](https://github.com/realm/realm-js/issues/????), since v?.?.?)
-* None
+* Fixed toolchain on Linux. On older Linux installations, the error `GLIBC_2.34' not found (required by /home/user/MyProject/node_modules/realm/generated/ts/realm.node)` could be observed. ([#6082](https://github.com/realm/realm-js/issues/6082), since v12.0.0)
 
 ### Compatibility
 * React Native >= v0.71.4

packages/realm/bindgen/CMakeLists.txt

@@ -22,9 +22,19 @@ if(DEFINED CMAKE_JS_VERSION)
         set(CMAKE_OSX_ARCHITECTURES "x86_64" CACHE STRING "")
       endif()
     elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux")
-        add_link_options(-fuse-ld=gold)
-        add_link_options(-Wl,-z,noexecstack)
-	    add_link_options(-Wl,--warn-execstack)
+      if(NODE_ARCH STREQUAL "arm")
+        set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_SOURCE_DIR}/vendor/realm-core/tools/cmake/armv7-linux-gnueabihf.toolchain.cmake")
+        # due to how multiarch works in debian this is needed to link to the correct system libraries
+        set(CMAKE_IGNORE_PATH "/usr/lib/x86_64-linux-gnu")
+      elseif(NODE_ARCH STREQUAL "arm64")
+        set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_SOURCE_DIR}/vendor/realm-core/tools/cmake/aarch64-linux-gnu.toolchain.cmake")
+        set(CMAKE_IGNORE_PATH "/usr/lib/x86_64-linux-gnu")
+      elseif(NODE_ARCH STREQUAL "x64")
+        set(CMAKE_TOOLCHAIN_FILE "${CMAKE_CURRENT_SOURCE_DIR}/vendor/realm-core/tools/cmake/x86_64-linux-gnu.toolchain.cmake")
+      endif()
+      add_link_options(-fuse-ld=gold)
+      add_link_options(-Wl,-z,noexecstack)
+      add_link_options(-Wl,--warn-execstack)
     endif()
 endif()