Merge pull request swiftlang#74810 from al45tair/eng/PR-116525111-6.0

[Build][Linux] Set `--build-id=sha1` for the linker.

Author: al45tair

cmake/modules/AddPureSwift.cmake

@@ -297,6 +297,12 @@ function(add_pure_swift_host_library name)
     endif()
   endif()
 
+  # Enable build IDs
+  if(SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_USE_BUILD_ID)
+    target_link_options(${name} PRIVATE
+      "SHELL:-Xlinker --build-id=sha1")
+  endif()
+
   # Export this target.
   set_property(GLOBAL APPEND PROPERTY SWIFT_EXPORTS ${name})
 endfunction()
@@ -398,6 +404,12 @@ function(add_pure_swift_host_tool name)
     )
   endif()
 
+  # Enable build IDs
+  if(SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_USE_BUILD_ID)
+    target_link_options(${name} PRIVATE
+      "SHELL:-Xlinker --build-id=sha1")
+  endif()
+
   # Workaround to touch the library and its objects so that we don't
   # continually rebuild (again, see corresponding change in swift-syntax).
   add_custom_command(

cmake/modules/AddSwift.cmake

@@ -447,6 +447,12 @@ function(_add_host_variant_link_flags target)
       "SHELL:-Xlinker -no_warn_duplicate_libraries")
   endif()
 
+  # Enable build IDs
+  if(SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_USE_BUILD_ID)
+    target_link_options(${target} PRIVATE
+      "SHELL:-Xlinker --build-id=sha1")
+  endif()
+
 endfunction()
 
 function(_add_swift_runtime_link_flags target relpath_to_lib_dir bootstrapping)

cmake/modules/SwiftConfigureSDK.cmake

@@ -168,6 +168,7 @@ endfunction()
 #   SWIFT_SDK_${prefix}_IS_SIMULATOR              Whether this is a simulator target.
 #   SWIFT_SDK_${prefix}_ARCH_${ARCH}_TRIPLE       Triple name
 #   SWIFT_SDK_${prefix}_ARCH_${ARCH}_MODULE       Module triple name for this SDK
+#   SWIFT_SDK_${prefix}_USE_BUILD_ID              Whether to pass --build-id to the linker
 macro(configure_sdk_darwin
     prefix name deployment_version xcrun_name
     triple_name module_name architectures)
@@ -216,6 +217,9 @@ macro(configure_sdk_darwin
   set(SWIFT_SDK_${prefix}_STATIC_ONLY FALSE)
   get_threading_package(${prefix} "darwin" SWIFT_SDK_${prefix}_THREADING_PACKAGE)
 
+  # On Darwin we get UUIDs automatically, without the --build-id flag
+  set(SWIFT_SDK_${prefix}_USE_BUILD_ID FALSE)
+
   set(SWIFT_SDK_${prefix}_ARCHITECTURES ${architectures})
   if(SWIFT_DARWIN_SUPPORTED_ARCHS)
     list_intersect(
@@ -335,6 +339,15 @@ macro(configure_sdk_unix name architectures)
     set(SWIFT_SDK_${prefix}_STATIC_ONLY FALSE)
   endif()
 
+  if("${prefix}" STREQUAL "LINUX"
+      OR "${prefix}" STREQUAL "ANDROID"
+      OR "${prefix}" STREQUAL "FREEBSD"
+      OR "${prefix}" STREQUAL "OPENBSD")
+    set(SWIFT_SDK_${prefix}_USE_BUILD_ID TRUE)
+  else()
+    set(SWIFT_SDK_${prefix}_USE_BUILD_ID FALSE)
+  endif()
+
   # GCC on Linux is usually located under `/usr`.
   # However, Ubuntu 20.04 ships with another GCC installation under `/`, which
   # does not include libstdc++. Swift build scripts pass `--sysroot=/` to
@@ -494,6 +507,7 @@ macro(configure_sdk_windows name environment architectures)
   set(SWIFT_SDK_${prefix}_IMPORT_LIBRARY_SUFFIX ".lib")
   set(SWIFT_SDK_${prefix}_STATIC_LINKING_SUPPORTED FALSE)
   set(SWIFT_SDK_${prefix}_STATIC_ONLY FALSE)
+  set(SWIFT_SDK_${prefix}_USE_BUILD_ID FALSE)
   get_threading_package(${prefix} "win32" SWIFT_SDK_${prefix}_THREADING_PACKAGE)
 
   foreach(arch ${architectures})

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -595,6 +595,11 @@ function(_add_target_variant_link_flags)
     endif()
   endif()
 
+  # Enable build-ids on non-Windows non-Darwin platforms
+  if(SWIFT_SDK_${LFLAGS_SDK}_USE_BUILD_ID)
+    list(APPEND result "-Wl,--build-id=sha1")
+  endif()
+
   # Enable dead stripping. Portions of this logic were copied from llvm's
   # `add_link_opts` function (which, perhaps, should have been used here in the
   # first place, but at this point it's hard to say whether that's feasible).