From 4368a29a2f0fb488ccd98e62903b11280f3182e5 Mon Sep 17 00:00:00 2001
From: Gabriel Ferreira <gabrielcarvfer@gmail.com>
Date: Sat, 18 Nov 2023 18:55:27 -0300
Subject: [PATCH] build: raise error when build_lib is incorrectly used by
 modules

---
 build-support/macros-and-definitions.cmake | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/build-support/macros-and-definitions.cmake b/build-support/macros-and-definitions.cmake
index 27d5d9eea..77e724085 100644
--- a/build-support/macros-and-definitions.cmake
+++ b/build-support/macros-and-definitions.cmake
@@ -1379,6 +1379,20 @@ macro(build_example)
     if(${EXAMPLE_IGNORE_PCH})
       set(IGNORE_PCH "IGNORE_PCH")
     endif()
+
+    set(current_directory ${CMAKE_CURRENT_SOURCE_DIR})
+    string(REPLACE "${PROJECT_SOURCE_DIR}" "" current_directory
+                   "${current_directory}"
+    )
+    if("${current_directory}" MATCHES ".*/(src|contrib)/.*")
+      message(
+        FATAL_ERROR
+          "build_example() macro is meant for ns-3-dev/examples, and not for modules. Use build_lib_example() instead."
+      )
+    endif()
+
+    get_filename_component(examplefolder ${CMAKE_CURRENT_SOURCE_DIR} NAME)
+
     # Create example library with sources and headers
     # cmake-format: off
     build_exec(