diff --git a/test/Driver/working-directory.swift b/test/Driver/working-directory.swift
index b5ab72fab7f..4bff2b21833 100644
--- a/test/Driver/working-directory.swift
+++ b/test/Driver/working-directory.swift
@@ -67,7 +67,7 @@
 
 // RUN: cd %t && %swiftc_driver -driver-print-jobs -working-directory %/S/Inputs -Xcc -working-directory -Xcc %/t -c %/s | %FileCheck %s -check-prefix=CLANG
 // CLANG: -Xcc -working-directory -Xcc SOURCE_DIR
-// CLANG-SAME: -Xcc -working-directory -Xcc BUILD_DIR
+// CLANG-SAME: -Xcc -working-directory -Xcc TMP_DIR
 
 // RUN: cd %t && %swiftc_driver -driver-print-jobs -working-directory %/S/Inputs -c main.swift | %FileCheck %s -check-prefix=OUTPUT_IMPLICIT_OBJ
 // OUTPUT_IMPLICIT_OBJ: -o {{"?}}SOURCE_DIR/test/Driver/Inputs{{\\\\|/}}main.o
diff --git a/test/Macros/macro_plugin_broken_shlib.swift b/test/Macros/macro_plugin_broken_shlib.swift
index eb5de20a97a..85686e6da54 100644
--- a/test/Macros/macro_plugin_broken_shlib.swift
+++ b/test/Macros/macro_plugin_broken_shlib.swift
@@ -18,8 +18,8 @@
 // RUN: c-index-test -read-diagnostics %t/macro_expand.dia 2>&1 | %FileCheck -check-prefix SERVER %s
 
 // SERVER-NOT: {{error|warning}}
-// SERVER: test.swift:1:33: warning: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'BUILD_DIR/{{.*}}/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/swift-plugin-server'; loader error: dlopen(BUILD_DIR/{{.*}}/libTestPlugin.dylib, {{.*}}): tried: 'BUILD_DIR/{{.*}}/plugins/libTestPlugin.dylib'
-// SERVER: test.swift:4:7: error: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'BUILD_DIR/{{.*}}/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/swift-plugin-server'; loader error: dlopen(BUILD_DIR/{{.*}}/libTestPlugin.dylib, {{.*}}): tried: 'BUILD_DIR/{{.*}}/plugins/libTestPlugin.dylib'
+// SERVER: test.swift:1:33: warning: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'TMP_DIR/plugins/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/swift-plugin-server'; loader error: dlopen(TMP_DIR/plugins/libTestPlugin.dylib, {{.*}}): tried: 'TMP_DIR/plugins/libTestPlugin.dylib'
+// SERVER: test.swift:4:7: error: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'TMP_DIR/plugins/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/swift-plugin-server'; loader error: dlopen(TMP_DIR/plugins/libTestPlugin.dylib, {{.*}}): tried: 'TMP_DIR/plugins/libTestPlugin.dylib'
 // SERVER: test.swift:1:33: note: 'fooMacro' declared here
 // SERVER-NOT: {{error|warning}}
 
@@ -34,8 +34,8 @@
 // RUN: c-index-test -read-diagnostics %t/macro_expand_inproc.dia 2>&1 | %FileCheck -check-prefix INPROC %s
 
 // INPROC-NOT: {{error|warning}}
-// INPROC: test.swift:1:33: warning: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'BUILD_DIR/{{.*}}/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/libSwiftInProcPluginServer.dylib'; loader error: dlopen(BUILD_DIR/{{.*}}/libTestPlugin.dylib, 0x0005): tried: 'BUILD_DIR/{{.*}}/libTestPlugin.dylib'
-// INPROC: test.swift:4:7: error: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'BUILD_DIR/{{.*}}/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/libSwiftInProcPluginServer.dylib'; loader error: dlopen(BUILD_DIR/{{.*}}/libTestPlugin.dylib, 0x0005): tried: 'BUILD_DIR/{{.*}}/libTestPlugin.dylib'
+// INPROC: test.swift:1:33: warning: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'TMP_DIR/plugins/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/libSwiftInProcPluginServer.dylib'; loader error: dlopen(TMP_DIR/plugins/libTestPlugin.dylib, 0x0005): tried: 'TMP_DIR/plugins/libTestPlugin.dylib'
+// INPROC: test.swift:4:7: error: external macro implementation type 'TestPlugin.FooMacro' could not be found for macro 'fooMacro'; failed to load library plugin 'TMP_DIR/plugins/libTestPlugin.dylib' in plugin server 'BUILD_DIR/{{.*}}/libSwiftInProcPluginServer.dylib'; loader error: dlopen(TMP_DIR/plugins/libTestPlugin.dylib, 0x0005): tried: 'TMP_DIR/plugins/libTestPlugin.dylib'
 // INPROC: test.swift:1:33: note: 'fooMacro' declared here
 // INPROC-NOT: {{error|warning}}
 
diff --git a/test/ModuleInterface/availability-scopes.swift b/test/ModuleInterface/availability-scopes.swift
index 2985d88ada8..767ad530e89 100644
--- a/test/ModuleInterface/availability-scopes.swift
+++ b/test/ModuleInterface/availability-scopes.swift
@@ -4,7 +4,7 @@
 // RUN: %target-swift-typecheck-module-from-interface(%t/Test.swiftinterface) -module-name Test -dump-availability-scopes 2>&1 | %FileCheck --strict-whitespace %s
 // RUN: %target-swift-frontend -compile-module-from-interface %t/Test.swiftinterface -o /dev/null -module-name Test -dump-availability-scopes 2>&1 | %FileCheck --strict-whitespace %s
 
-// CHECK: {{^}}(root {{.*}} file={{.*}}{{/|\\}}availability-scopes.swift.tmp{{/|\\}}Test.swiftinterface
+// CHECK: {{^}}(root {{.*}} file=TMP_DIR{{/|\\}}Test.swiftinterface
 // CHECK: {{^}}  (decl {{.*}}unavailable=* decl=unavailable()
 @available(*, unavailable)
 public func unavailable() { }
diff --git a/test/SILGen/magic_identifier_file_conflicting.swift.gyb b/test/SILGen/magic_identifier_file_conflicting.swift.gyb
index 186f66dad59..2cfea7ca1a7 100644
--- a/test/SILGen/magic_identifier_file_conflicting.swift.gyb
+++ b/test/SILGen/magic_identifier_file_conflicting.swift.gyb
@@ -92,8 +92,8 @@ def fixit_loc(start_col, orig_suffix):
 //
 
 // CHECK-LABEL: // Mappings from '#fileID' to '#filePath':
-// CHECK-NEXT:  //   'Foo/magic_identifier_file_conflicting.swift' => 'BUILD_DIR{{.*}}{{[/\\]}}test-{{[^/]+}}{{[/\\]}}SILGen{{[/\\]}}Output{{[/\\]}}magic_identifier_file_conflicting.swift.gyb.tmp{{[/\\]}}magic_identifier_file_conflicting.swift'
-// CHECK-NEXT:  //   'Foo/magic_identifier_file_conflicting.swift' => 'BUILD_DIR{{.*}}{{[/\\]}}test-{{[^/]+}}{{[/\\]}}SILGen{{[/\\]}}Output{{[/\\]}}magic_identifier_file_conflicting.swift.gyb.tmp{{[/\\]}}other_path_b{{[/\\]}}magic_identifier_file_conflicting.swift' (alternate)
+// CHECK-NEXT:  //   'Foo/magic_identifier_file_conflicting.swift' => 'TMP_DIR{{[/\\]}}magic_identifier_file_conflicting.swift'
+// CHECK-NEXT:  //   'Foo/magic_identifier_file_conflicting.swift' => 'TMP_DIR{{[/\\]}}other_path_b{{[/\\]}}magic_identifier_file_conflicting.swift' (alternate)
 // CHECK-NEXT:  //   'Foo/magic_identifier_file_conflicting.swift' => 'magic_identifier_file_conflicting.swift' (alternate)
 // CHECK-NEXT:  //   'Foo/magic_identifier_file_conflicting_other.swift' => 'SOURCE_DIR{{[/\\]}}test{{[/\\]}}SILGen{{[/\\]}}Inputs{{[/\\]}}magic_identifier_file_conflicting_other.swift'
 // CHECK-NEXT:  //   'Foo/other_file_a.swift' => 'other_file_a.swift'
diff --git a/test/ScanDependencies/binary_module_only.swift b/test/ScanDependencies/binary_module_only.swift
index d3c553ba5ae..c0b611e820e 100644
--- a/test/ScanDependencies/binary_module_only.swift
+++ b/test/ScanDependencies/binary_module_only.swift
@@ -10,7 +10,7 @@ import Foo
 
 // BINARY_MODULE_ONLY: "swiftPrebuiltExternal": "Foo"
 // BINARY_MODULE_ONLY:  "swiftPrebuiltExternal": {
-// BINARY_MODULE_ONLY-NEXT:  "compiledModulePath": "BUILD_DIR/{{.*}}/ScanDependencies/Output/binary_module_only.swift.tmp/binaryModuleOnly/Foo.swiftmodule",
+// BINARY_MODULE_ONLY-NEXT:  "compiledModulePath": "TMP_DIR/binaryModuleOnly/Foo.swiftmodule",
 
 // HAS_NO_COMPILED-NOT: "{{.*}}Foo.swiftmodule{{.*}}.swiftmodule"
 
diff --git a/test/ScanDependencies/diagnose_dependency_cycle_shadow.swift b/test/ScanDependencies/diagnose_dependency_cycle_shadow.swift
index 172a83ca741..275bb59c9a3 100644
--- a/test/ScanDependencies/diagnose_dependency_cycle_shadow.swift
+++ b/test/ScanDependencies/diagnose_dependency_cycle_shadow.swift
@@ -22,7 +22,7 @@
 // RUN: not %target-swift-frontend -scan-dependencies -module-cache-path %t/module-cache %t/test.swift -o %t/deps.json -I %t/inputs -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -module-name CycleKit  &> %t/out.txt
 // RUN: %FileCheck --check-prefix=CHECK-NONSDK %s < %t/out.txt
 
-// CHECK-NONSDK: note: source target 'CycleKit' shadowing a Swift module with the same name at: '{{.*}}{{/|\\}}diagnose_dependency_cycle_shadow.swift.tmp{{/|\\}}inputs'
+// CHECK-NONSDK: note: source target 'CycleKit' shadowing a Swift module with the same name at: 'TMP_DIR{{/|\\}}inputs'
 
 // SDK dependency shadowing
 // RUN: not %target-swift-frontend -scan-dependencies -module-cache-path %t/module-cache %t/test.swift -o %t/deps.json -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -module-name CycleKit -sdk %t/mock.sdk &> %t/out-sdk.txt
diff --git a/test/ScanDependencies/explicit-module-map-clang-and-swift.swift b/test/ScanDependencies/explicit-module-map-clang-and-swift.swift
index e0d1421d203..2148ff7d7fc 100644
--- a/test/ScanDependencies/explicit-module-map-clang-and-swift.swift
+++ b/test/ScanDependencies/explicit-module-map-clang-and-swift.swift
@@ -55,7 +55,7 @@
 
 // RUN: %target-swift-frontend -emit-module -emit-module-path %t/Foo.swiftmodule -disable-implicit-swift-modules -module-cache-path %t.module-cache -explicit-swift-module-map-file %t/inputs/map.json -Rmodule-loading -Xcc -Rmodule-import %s 2>&1 | %FileCheck %s
 
-// CHECK: <unknown>:0: remark: importing module 'A' from {{.*}}{{/|\\}}explicit-module-map-clang-and-swift.swift.tmp{{/|\\}}inputs{{/|\\}}A.pcm'
+// CHECK: <unknown>:0: remark: importing module 'A' from 'TMP_DIR{{/|\\}}inputs{{/|\\}}A.pcm'
 
 import A
 
diff --git a/test/ScanDependencies/preserve_used_vfs.swift b/test/ScanDependencies/preserve_used_vfs.swift
index 54f3c92fc04..b8d88111495 100644
--- a/test/ScanDependencies/preserve_used_vfs.swift
+++ b/test/ScanDependencies/preserve_used_vfs.swift
@@ -131,34 +131,34 @@ func testIndirect() { funcRedirectedIndirect() }
 // CHECK: "-compile-module-from-interface"
 // CHECK: "-ivfsoverlay",
 // CHECK-NEXT: "-Xcc",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay.yaml",
 // CHECK-NEXT: "-Xcc",
 // CHECK-NEXT: "-ivfsoverlay",
 // CHECK-NEXT: "-Xcc",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay-2.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay-2.yaml",
 // CHECK: ],
 
 /// --------Clang module F
 // CHECK-LABEL: "modulePath": "{{.*}}{{/|\\}}F-{{.*}}.pcm",
 // CHECK: "commandLine": [
 // CHECK: "-vfsoverlay",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay.yaml",
 // CHECK-NEXT: "-vfsoverlay",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay-2.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay-2.yaml",
 // CHECK: "-ivfsoverlay",
 // CHECK-NEXT: "-Xcc",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay.yaml",
 // CHECK-NEXT: "-Xcc",
 // CHECK-NEXT: "-ivfsoverlay",
 // CHECK-NEXT: "-Xcc",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay-2.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay-2.yaml",
 // CHECK: ]
 
 /// --------Clang module Indirect
 // CHECK-LABEL: "modulePath": "{{.*}}{{/|\\}}Indirect-{{.*}}.pcm",
 // CHECK-NOT: overlay.yaml
 // CHECK: "-vfsoverlay",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay-2.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay-2.yaml",
 // CHECK: "-ivfsoverlay",
 // CHECK-NEXT: "-Xcc",
-// CHECK-NEXT: "{{.*}}{{/|\\}}preserve_used_vfs.swift.tmp{{/|\\}}overlay-2.yaml",
+// CHECK-NEXT: "TMP_DIR{{/|\\}}overlay-2.yaml",
diff --git a/test/ScanDependencies/separate_clang_scan_cache.swift b/test/ScanDependencies/separate_clang_scan_cache.swift
index 324a601506b..f57de1c9dc4 100644
--- a/test/ScanDependencies/separate_clang_scan_cache.swift
+++ b/test/ScanDependencies/separate_clang_scan_cache.swift
@@ -10,6 +10,6 @@
 // Ensure we the modules' output path is set to the module cache
 // CHECK-DEPS: "swift": "A"
 // CHECK-DEPS:            "swift": "A"
-// CHECK-DEPS:      "modulePath": "{{.*}}separate_clang_scan_cache.swift.tmp.module-cache{{/|\\\\}}A-{{.*}}.swiftmodule"
+// CHECK-DEPS:      "modulePath": "TMP_DIR.module-cache{{/|\\\\}}A-{{.*}}.swiftmodule"
 
 import A
diff --git a/test/ScanDependencies/separate_clang_scan_cache_bridging.swift b/test/ScanDependencies/separate_clang_scan_cache_bridging.swift
index 18584c63f70..88b3c945d4c 100644
--- a/test/ScanDependencies/separate_clang_scan_cache_bridging.swift
+++ b/test/ScanDependencies/separate_clang_scan_cache_bridging.swift
@@ -14,12 +14,12 @@
 // CHECK-DEPS:            "clang": "F"
 // CHECK-DEPS-NEXT:     },
 // CHECK-DEPS-NEXT:     {
-// CHECK-DEPS-NEXT:       "modulePath": "{{.*}}separate_clang_scan_cache_bridging.swift.tmp.module-cache{{/|\\\\}}F-{{.*}}.pcm"
+// CHECK-DEPS-NEXT:       "modulePath": "TMP_DIR.module-cache{{/|\\\\}}F-{{.*}}.pcm"
 
 // CHECK-DEPS:            "swift": "A"
 // CHECK-DEPS-NEXT:     },
 // CHECK-DEPS-NEXT:     {
-// CHECK-DEPS-NEXT:       "modulePath": "{{.*}}separate_clang_scan_cache_bridging.swift.tmp.module-cache{{/|\\\\}}A-{{.*}}.swiftmodule"
+// CHECK-DEPS-NEXT:       "modulePath": "TMP_DIR.module-cache{{/|\\\\}}A-{{.*}}.swiftmodule"
 
 
 
diff --git a/test/SourceKit/Indexing/indexstore_multifile.swift b/test/SourceKit/Indexing/indexstore_multifile.swift
index c41b0bf392d..e7fde4bc23f 100644
--- a/test/SourceKit/Indexing/indexstore_multifile.swift
+++ b/test/SourceKit/Indexing/indexstore_multifile.swift
@@ -17,7 +17,7 @@ struct Foo {
 // CHECK: indexstore_multifile.o-{{.*}}
 // CHECK: module-name: indexstoremodule
 // CHECK: main-path: SOURCE_DIR{{/|\\}}test{{/|\\}}SourceKit{{/|\\}}Indexing{{/|\\}}indexstore_multifile.swift
-// CHECK: out-file: BUILD_DIR{{.*}}indexstore_multifile.o
+// CHECK: out-file: TMP_DIR{{/|\\}}indexstore_multifile.o
 // CHECK: is-debug: 1
 // CHECK: Unit | system | Swift | {{.*}}{{/|\\}}Swift.swiftmodule
 // CHECK: Record | user | SOURCE_DIR{{/|\\}}test{{/|\\}}SourceKit{{/|\\}}Indexing{{/|\\}}indexstore_multifile.swift | indexstore_multifile.swift-{{.*}}