From ed27df5760490eaaa620c2537c59c6ace2d90c4e Mon Sep 17 00:00:00 2001
From: Thomas Khyn <thomas@ksytek.com>
Date: Mon, 10 Feb 2025 21:18:33 +1300
Subject: [PATCH] Replace forward slashes by backslashes in BMI path for MSVC.
 (#4344)

* Fix slashes in BMI path for MSVC builds
* Fix BMI path for MSVC builds when building with Ninja generator
---
 CMakeLists.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8df6670d..00c05908 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,13 @@ endfunction()
 # DEPRECATED! Should be merged into add_module_library.
 function(enable_module target)
   if (MSVC)
-    set(BMI ${CMAKE_CURRENT_BINARY_DIR}/${target}.ifc)
+    if(CMAKE_GENERATOR STREQUAL "Ninja")
+      # Ninja dyndep expects the .ifc output to be located in a specific relative path
+      file(RELATIVE_PATH BMI_DIR "${CMAKE_BINARY_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/${target}.dir")
+    else()
+      set(BMI_DIR "${CMAKE_CURRENT_BINARY_DIR}")
+    endif()
+    file(TO_NATIVE_PATH "${BMI_DIR}/${target}.ifc" BMI)
     target_compile_options(${target}
       PRIVATE /interface /ifcOutput ${BMI}
       INTERFACE /reference fmt=${BMI})