From 8e43e3ec3760f2b0d5c7ac31564ff27ef2863948 Mon Sep 17 00:00:00 2001
From: Alastair Houghton <ahoughton@apple.com>
Date: Wed, 26 Jun 2024 13:57:01 +0100
Subject: [PATCH] [Linux] Enable build IDs.

We should use build IDs on Linux so that we can identify the built
artefacts, and also so that we can match them up with debug
information should we choose to separate it.

rdar://130582819
---
 CMakeLists.txt                   | 3 +++
 src/BlocksRuntime/CMakeLists.txt | 4 ++++
 src/CMakeLists.txt               | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b11d52266..4cb17649a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -122,6 +122,7 @@ include(CheckCSourceCompiles)
 include(CheckFunctionExists)
 include(CheckIncludeFiles)
 include(CheckLibraryExists)
+include(CheckLinkerFlag)
 include(CheckSymbolExists)
 include(GNUInstallDirs)
 include(CTest)
@@ -175,6 +176,8 @@ option(ENABLE_THREAD_LOCAL_STORAGE "enable usage of thread local storage via _Th
 set(DISPATCH_USE_THREAD_LOCAL_STORAGE ${ENABLE_THREAD_LOCAL_STORAGE})
 
 
+check_linker_flag(C "LINKER:--build-id=sha1" LINKER_SUPPORTS_BUILD_ID)
+
 check_symbol_exists(__GNU_LIBRARY__ "features.h" _GNU_SOURCE)
 if(_GNU_SOURCE)
   set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_GNU_SOURCE)
diff --git a/src/BlocksRuntime/CMakeLists.txt b/src/BlocksRuntime/CMakeLists.txt
index 50123d4b7..945e87a7e 100644
--- a/src/BlocksRuntime/CMakeLists.txt
+++ b/src/BlocksRuntime/CMakeLists.txt
@@ -22,6 +22,10 @@ endif()
 set_target_properties(BlocksRuntime PROPERTIES
   POSITION_INDEPENDENT_CODE TRUE)
 
+if(LINKER_SUPPORTS_BUILD_ID)
+  target_link_options(BlocksRuntime PRIVATE "LINKER:--build-id=sha1")
+endif()
+
 add_library(BlocksRuntime::BlocksRuntime ALIAS BlocksRuntime)
 
 install(FILES Block.h
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 570c9197f..320b6fcdc 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -178,6 +178,10 @@ if(NOT CMAKE_SYSTEM_NAME MATCHES "Darwin|Windows")
   set_target_properties(dispatch PROPERTIES INSTALL_RPATH "$ORIGIN")
 endif()
 
+if(LINKER_SUPPORTS_BUILD_ID)
+  target_link_options(dispatch PRIVATE "LINKER:--build-id=sha1")
+endif()
+
 if(ENABLE_SWIFT)
   add_subdirectory(swift)
 endif()