From 3b6f55587ea72e7f8c6df235d8cf1a8f5c1fad0e Mon Sep 17 00:00:00 2001
From: Lee Kerley <ld_kerley@apple.com>
Date: Mon, 10 Jun 2024 17:02:09 -0700
Subject: [PATCH] add CMAKE_OSX_SYSROOT when compiling bitcode.

---
 src/cmake/llvm_macros.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/cmake/llvm_macros.cmake b/src/cmake/llvm_macros.cmake
index 3afeef19d..00c5989c2 100644
--- a/src/cmake/llvm_macros.cmake
+++ b/src/cmake/llvm_macros.cmake
@@ -84,6 +84,10 @@ function ( EMBED_LLVM_BITCODE_IN_CPP src_list suffix output_name list_to_append_
         COMMAND ${LLVM_BC_GENERATOR}
             ${LLVM_COMPILE_FLAGS}
             ${ALL_INCLUDE_DIRS}
+
+            # Added to force the discovery of the c++ standard headers on MACOS
+            -isysroot ${CMAKE_OSX_SYSROOT}
+
             -DOSL_COMPILING_TO_BITCODE=1
             -Wno-deprecated-register
             # the following 2 warnings can be restored when all 3rd parties have fixed their export macros