From 53c70df378181166243db436085ad9b076297cdb Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <abdulras@thebrowser.company>
Date: Mon, 17 Feb 2025 12:55:14 -0800
Subject: [PATCH] Runtimes: add `-nostdlibimport` to the runtime build

If the compiler being used to build the runtime is from a complete
toolchain, we may inadvertently pick up runtime from the previous build
rather than the just built Swift Core library. Pass `-nostdlibimport` to
ensure that we do not search the default search paths when building and
use the locally built swiftCore.
---
 Runtimes/Core/CMakeLists.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Runtimes/Core/CMakeLists.txt b/Runtimes/Core/CMakeLists.txt
index 0b376b3fb83ef..500dd4324d10a 100644
--- a/Runtimes/Core/CMakeLists.txt
+++ b/Runtimes/Core/CMakeLists.txt
@@ -172,6 +172,7 @@ add_compile_options(
 add_link_options($<$<PLATFORM_ID:Windows>:LINKER:/WX>)
 
 add_compile_options(
+  "$<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-library-level api>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-runtime-compatibility-version none>"
   "$<$<COMPILE_LANGUAGE:Swift>:-disable-autolinking-runtime-compatibility-dynamic-replacements>"