[Linux] Provide a statically linked swift-backtrace binary.

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -1518,8 +1518,14 @@ function(add_swift_target_library_single target name)
         "${SWIFT_NATIVE_SWIFT_TOOLS_PATH}/../lib/swift/${SWIFT_SDK_${SWIFTLIB_SINGLE_SDK}_LIB_SUBDIR}")
     target_link_directories(${target_static} PRIVATE
       ${library_search_directories})
+
+    _list_add_string_suffix(
+        "${SWIFTLIB_SINGLE_PRIVATE_LINK_LIBRARIES}"
+        "-static"
+        target_private_libs)
+
     target_link_libraries("${target_static}" PRIVATE
-        ${SWIFTLIB_SINGLE_PRIVATE_LINK_LIBRARIES})
+        ${target_private_libs})
 
     # Force executables linker language to be CXX so that we do not link using the
     # host toolchain swiftc.
@@ -2539,7 +2545,8 @@ endfunction()
 #     The Swift installation component that this executable belongs to.
 #     Defaults to never_install.
 function(_add_swift_target_executable_single name)
-  set(options)
+  set(options
+    NOSWIFTRT)
   set(single_parameter_options
     ARCHITECTURE
     SDK
@@ -2617,6 +2624,15 @@ function(_add_swift_target_executable_single name)
       ${SWIFTEXE_SINGLE_SOURCES}
       ${SWIFTEXE_SINGLE_EXTERNAL_SOURCES})
 
+  # ELF and COFF need swiftrt
+  if(("${SWIFT_SDK_${SWIFTEXE_SINGLE_SDK}_OBJECT_FORMAT}" STREQUAL "ELF" OR
+      "${SWIFT_SDK_${SWIFTEXE_SINGLE_SDK}_OBJECT_FORMAT}" STREQUAL "COFF")
+     AND NOT SWIFTEXE_SINGLE_NOSWIFTRT)
+    target_sources(${name}
+      PRIVATE
+      $<TARGET_OBJECTS:swiftImageRegistrationObject${SWIFT_SDK_${SWIFTEXE_SINGLE_SDK}_OBJECT_FORMAT}-${SWIFT_SDK_${SWIFTEXE_SINGLE_SDK}_LIB_SUBDIR}-${SWIFTEXE_SINGLE_ARCHITECTURE}>)
+  endif()
+
   add_dependencies_multiple_targets(
       TARGETS "${name}"
       DEPENDS
@@ -2680,6 +2696,24 @@ function(_add_swift_target_executable_single name)
   set_target_properties(${name} PROPERTIES FOLDER "Swift executables")
 endfunction()
 
+# Conditionally append -static to a name, if that variant is a valid target
+function(append_static name result_var_name)
+  cmake_parse_arguments(APPEND_TARGET
+    "STATIC_SWIFT_STDLIB"
+    ""
+    ""
+    ${ARGN})
+  if(STATIC_SWIFT_STDLIB)
+    if(TARGET "${name}-static")
+      set("${result_var_name}" "${name}-static" PARENT_SCOPE)
+    else()
+      set("${result_var_name}" "${name}" PARENT_SCOPE)
+    endif()
+  else()
+    set("${result_var_name}" "${name}" PARENT_SCOPE)
+  endif()
+endfunction()
+
 # Add an executable for each target variant. Executables are given suffixes
 # with the variant SDK and ARCH.
 #
@@ -2688,7 +2722,9 @@ function(add_swift_target_executable name)
   set(SWIFTEXE_options
     EXCLUDE_FROM_ALL
     BUILD_WITH_STDLIB
-    BUILD_WITH_LIBEXEC)
+    BUILD_WITH_LIBEXEC
+    PREFER_STATIC
+    NOSWIFTRT)
   set(SWIFTEXE_single_parameter_options
     INSTALL_IN_COMPONENT)
   set(SWIFTEXE_multiple_parameter_options
@@ -2874,8 +2910,12 @@ function(add_swift_target_executable name)
         list(APPEND swiftexe_module_dependency_targets
           "swift${mod}${MODULE_VARIANT_SUFFIX}")
 
-        list(APPEND swiftexe_link_libraries_targets
-          "swift${mod}${VARIANT_SUFFIX}")
+        set(library_target "swift${mod}${VARIANT_SUFFIX}")
+        if(SWIFTEXE_TARGET_PREFER_STATIC AND TARGET "${library_target}-static")
+          set(library_target "${library_target}-static")
+        endif()
+
+        list(APPEND swiftexe_link_libraries_targets "${library_target}")
       endforeach()
 
       # Don't add the ${arch} to the suffix.  We want to link against fat
@@ -2887,6 +2927,7 @@ function(add_swift_target_executable name)
 
       _add_swift_target_executable_single(
           ${VARIANT_NAME}
+          ${SWIFTEXE_TARGET_NOSWIFTRT_keyword}
           ${SWIFTEXE_TARGET_SOURCES}
           DEPENDS
             ${SWIFTEXE_TARGET_DEPENDS_with_suffix}

stdlib/cmake/modules/SwiftSource.cmake

@@ -903,11 +903,6 @@ function(_compile_swift_files
 
   # First generate the obj dirs
   list(REMOVE_DUPLICATES dirs_to_create)
-  add_custom_command_target(
-      create_dirs_dependency_target
-      COMMAND "${CMAKE_COMMAND}" -E make_directory ${dirs_to_create}
-      OUTPUT ${dirs_to_create}
-      COMMENT "Generating dirs for ${first_output}")
 
   # Then we can compile both the object files and the swiftmodule files
   # in parallel in this target for the object file, and ...
@@ -937,6 +932,7 @@ function(_compile_swift_files
 
   add_custom_command_target(
       dependency_target
+      COMMAND "${CMAKE_COMMAND}" -E make_directory ${dirs_to_create}
       COMMAND
         ${set_environment_args}
         "$<TARGET_FILE:Python3::Interpreter>" "${line_directive_tool}" "@${file_path}" --

stdlib/public/Backtracing/CMakeLists.txt

@@ -78,7 +78,7 @@ add_swift_target_library(swift_Backtracing ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} I
 
   SWIFT_MODULE_DEPENDS ${concurrency}
 
-  LINK_LIBRARIES ${swift_backtracing_link_libraries}
+  PRIVATE_LINK_LIBRARIES ${swift_backtracing_link_libraries}
 
   SWIFT_COMPILE_FLAGS
     ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}

stdlib/public/libexec/swift-backtrace/CMakeLists.txt

@@ -26,13 +26,18 @@ set(BACKTRACING_COMPILE_FLAGS
   "-Xcc;-I${SWIFT_SOURCE_DIR}/include"
   "-Xcc;-I${CMAKE_BINARY_DIR}/include")
 
-add_swift_target_executable(swift-backtrace BUILD_WITH_LIBEXEC
+set(BACKTRACING_SOURCES
   main.swift
   AnsiColor.swift
   TargetMacOS.swift
   TargetLinux.swift
   Themes.swift
   Utils.swift
+  )
+
+
+add_swift_target_executable(swift-backtrace BUILD_WITH_LIBEXEC
+  ${BACKTRACING_SOURCES}
 
   SWIFT_MODULE_DEPENDS         ${backtracing}
 
@@ -47,3 +52,22 @@ add_swift_target_executable(swift-backtrace BUILD_WITH_LIBEXEC
 
   TARGET_SDKS OSX LINUX)
 
+if(SWIFT_BUILD_STATIC_STDLIB)
+  add_swift_target_executable(swift-backtrace-static BUILD_WITH_LIBEXEC
+    PREFER_STATIC
+
+    ${BACKTRACING_SOURCES}
+
+    SWIFT_MODULE_DEPENDS         ${backtracing}
+
+    SWIFT_MODULE_DEPENDS_OSX     ${darwin}
+    SWIFT_MODULE_DEPENDS_WINDOWS ${wincrt_sdk}
+    SWIFT_MODULE_DEPENDS_LINUX   ${glibc}
+
+    INSTALL_IN_COMPONENT libexec
+    COMPILE_FLAGS
+      ${BACKTRACING_COMPILE_FLAGS}
+      -parse-as-library
+
+    TARGET_SDKS LINUX)
+endif()

test/Backtracing/StaticBacktracer.swift

@@ -0,0 +1,68 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-build-swift %s -parse-as-library %import-static-libdispatch -Onone -g -o %t/StaticBacktracer
+// RUN: %target-codesign %t/StaticBacktracer
+// RUN: /usr/bin/ldd %backtracer-static | %FileCheck %s --check-prefix LIBS
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no,swift-backtrace=%backtracer-static %target-run %t/StaticBacktracer 2>&1 || true) | %FileCheck %s
+
+// UNSUPPORTED: use_os_stdlib
+// UNSUPPORTED: back_deployment_runtime
+// UNSUPPORTED: asan
+// REQUIRES: executable_test
+// REQUIRES: backtracing
+// REQUIRES: static_stdlib
+// REQUIRES: OS=linux-gnu
+
+func level1() {
+  level2()
+}
+
+func level2() {
+  level3()
+}
+
+func level3() {
+  level4()
+}
+
+func level4() {
+  level5()
+}
+
+func level5() {
+  print("About to crash")
+  let ptr = UnsafeMutablePointer<Int>(bitPattern: 4)!
+  ptr.pointee = 42
+}
+
+@main
+struct StaticBacktracer {
+  static func main() {
+    level1()
+  }
+}
+
+// CHECK: *** Program crashed: Bad pointer dereference at 0x{{0+}}4 ***
+
+// CHECK: Thread 0 {{(".*" )?}}crashed:
+
+// CHECK: 0               0x{{[0-9a-f]+}} level5() + {{[0-9]+}} in StaticBacktracer at {{.*}}/StaticBacktracer.swift:34:15
+// CHECK-NEXT: 1 [ra]          0x{{[0-9a-f]+}} level4() + {{[0-9]+}} in StaticBacktracer at {{.*}}/StaticBacktracer.swift:28:3
+// CHECK-NEXT: 2 [ra]          0x{{[0-9a-f]+}} level3() + {{[0-9]+}} in StaticBacktracer at {{.*}}/StaticBacktracer.swift:24:3
+// CHECK-NEXT: 3 [ra]          0x{{[0-9a-f]+}} level2() + {{[0-9]+}} in StaticBacktracer at {{.*}}/StaticBacktracer.swift:20:3
+// CHECK-NEXT: 4 [ra]          0x{{[0-9a-f]+}} level1() + {{[0-9]+}} in StaticBacktracer at {{.*}}/StaticBacktracer.swift:16:3
+// CHECK-NEXT: 5 [ra]          0x{{[0-9a-f]+}} static StaticBacktracer.main() + {{[0-9]+}} in StaticBacktracer at {{.*}}/StaticBacktracer.swift:40:5
+// CHECK-NEXT: 6 [ra] [system] 0x{{[0-9a-f]+}} static StaticBacktracer.$main() + {{[0-9]+}} in StaticBacktracer at {{.*}}/<compiler-generated>
+// CHECK-NEXT: 7 [ra] 0x{{[0-9a-f]+}} main + {{[0-9]+}} in StaticBacktracer at {{.*}}/StaticBacktracer.swift
+
+// CHECK: Registers:
+
+// CHECK: Images ({{[0-9]+}} omitted):
+
+// CHECK: {{0x[0-9a-f]+}}–{{0x[0-9a-f]+}}{{ +}}{{([0-9a-f]+|<no build ID>)}}{{ +}}StaticBacktracer{{ +}}{{.*}}/StaticBacktracer
+
+// .............................................................................
+
+// We mustn't have any Swift libraries dynamically linked here; that's the
+// entire point.
+
+// LIBS-NOT: libswift{{.*}}.so