From 3f2988b58b1ed074b6fb71f439625ffd0e04cf9e Mon Sep 17 00:00:00 2001
From: Alastair Houghton <ahoughton@apple.com>
Date: Wed, 26 Jun 2024 13:51:54 +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://130582768
---
 CMakeLists.txt                              | 4 ++++
 Sources/Foundation/CMakeLists.txt           | 4 ++++
 Sources/FoundationNetworking/CMakeLists.txt | 4 ++++
 Sources/FoundationXML/CMakeLists.txt        | 4 ++++
 4 files changed, 16 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62b22af84d..6c59d13120 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,6 +74,10 @@ else()
 endif()
 FetchContent_MakeAvailable(SwiftFoundationICU SwiftFoundation)
 
+include(CheckLinkerFlag)
+
+check_linker_flag(C "LINKER:--build-id=sha1" LINKER_SUPPORTS_BUILD_ID)
+
 # Precompute module triple for installation
 if(NOT SwiftFoundation_MODULE_TRIPLE)
     set(module_triple_command "${CMAKE_Swift_COMPILER}" -print-target-info)
diff --git a/Sources/Foundation/CMakeLists.txt b/Sources/Foundation/CMakeLists.txt
index b591310cda..d382f15c94 100644
--- a/Sources/Foundation/CMakeLists.txt
+++ b/Sources/Foundation/CMakeLists.txt
@@ -171,5 +171,9 @@ set_target_properties(Foundation PROPERTIES
 target_link_libraries(Foundation PUBLIC
     swiftDispatch)
 
+if(LINKER_SUPPORTS_BUILD_ID)
+  target_link_options(Foundation PRIVATE "LINKER:--build-id=sha1")
+endif()
+
 set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS Foundation)
 _foundation_install_target(Foundation)
diff --git a/Sources/FoundationNetworking/CMakeLists.txt b/Sources/FoundationNetworking/CMakeLists.txt
index 33d6872ae7..75c8505060 100644
--- a/Sources/FoundationNetworking/CMakeLists.txt
+++ b/Sources/FoundationNetworking/CMakeLists.txt
@@ -71,5 +71,9 @@ target_link_options(FoundationNetworking PRIVATE
 set_target_properties(FoundationNetworking PROPERTIES
     INSTALL_RPATH "$ORIGIN")
 
+if(LINKER_SUPPORTS_BUILD_ID)
+  target_link_options(FoundationNetworking PRIVATE "LINKER:--build-id=sha1")
+endif()
+
 set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS FoundationNetworking)
 _foundation_install_target(FoundationNetworking)
diff --git a/Sources/FoundationXML/CMakeLists.txt b/Sources/FoundationXML/CMakeLists.txt
index e27bd67308..9640298a71 100644
--- a/Sources/FoundationXML/CMakeLists.txt
+++ b/Sources/FoundationXML/CMakeLists.txt
@@ -46,5 +46,9 @@ target_link_options(FoundationXML PRIVATE
 set_target_properties(FoundationXML PROPERTIES
     INSTALL_RPATH "$ORIGIN")
 
+if(LINKER_SUPPORTS_BUILD_ID)
+  target_link_options(FoundationXML PRIVATE "LINKER:--build-id=sha1")
+endif()
+
 set_property(GLOBAL APPEND PROPERTY Foundation_EXPORTS FoundationXML)
 _foundation_install_target(FoundationXML)