From 03a8ad13b82c40e748113239bf7f4e3eb06ed492 Mon Sep 17 00:00:00 2001
From: Alastair Houghton <ahoughton@apple.com>
Date: Mon, 29 Sep 2025 15:29:10 +0100
Subject: [PATCH] [Build] Enable frame pointers.

Frame pointers should be enabled everywhere.

rdar://160759746
(cherry picked from commit a8b689a278a045b8ea6bd1f2ddfd3c52369db89d)
---
 CMakeLists.txt                          |  2 ++
 cmake/modules/EnableFramePointers.cmake | 13 +++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 cmake/modules/EnableFramePointers.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 626368d01..f9d08a34c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -126,6 +126,8 @@ include(DispatchCompilerWarnings)
 include(DTrace)
 include(SwiftSupport)
 
+include(EnableFramePointers)
+
 # NOTE(abdulras) this is the CMake supported way to control whether we generate
 # shared or static libraries.  This impacts the behaviour of `add_library` in
 # what type of library it generates.
diff --git a/cmake/modules/EnableFramePointers.cmake b/cmake/modules/EnableFramePointers.cmake
new file mode 100644
index 000000000..8573d8dc4
--- /dev/null
+++ b/cmake/modules/EnableFramePointers.cmake
@@ -0,0 +1,13 @@
+#
+# Including this file enables frame pointers, if we know how.
+#
+
+include(CheckCompilerFlag)
+
+# Check if the compiler supports -fno-omit-frame-pointer
+check_compiler_flag(C -fno-omit-frame-pointer SUPPORTS_NO_OMIT_FP)
+
+# If it does, use it
+if (SUPPORTS_NO_OMIT_FP)
+  add_compile_options($<$<COMPILE_LANGUAGE:C,CXX>:-fno-omit-frame-pointer>)
+endif()