Change the runpath to an architecture-specific directory on ELF platforms

This is needed for swiftlang/swift#63782, which changes the Unix toolchain to look
for libraries in architecture-specific directories.

Author: finagolfin

lit.cfg

@@ -78,6 +78,7 @@ config.test_exec_root = lit_config.params.get(
 # target and stick it in here.
 if platform.system() == 'Linux':
     config.target_triple = 'linux'
+    linux_run_arch = subprocess.check_output(["uname", "-m"]).strip().decode("utf-8")
 elif platform.system() == 'Darwin':
     config.target_triple = 'darwin'
 
@@ -234,6 +235,7 @@ config.substitutions.append( ('%{not}', os.path.join(srcroot, "not")) )
 config.substitutions.append( ('%{lldb}', lldb_path) )
 if platform.system() == 'Linux':
     config.substitutions.append( ('%{repl_swift}', repl_swift_dummy_path) )
+    config.substitutions.append( ('%{linux_arch}', linux_run_arch) )
 config.substitutions.append( ('%{swift}', swift_path) )
 config.substitutions.append( ('%{swiftc}', swiftc_path) )
 config.substitutions.append( ('%{FileCheck}', filecheck_path) )

test-snapshot-binaries/test-rpath-linux.py

@@ -1,25 +1,31 @@
 # Tests that DT_RPATH is correct for the dummy repl executable on Linux.
 # REQUIRES: platform=Linux
 # RUN: %{readelf} -d %{repl_swift} | %{FileCheck} %s
-# CHECK: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN/../lib/swift/linux
+# CHECK: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN/../lib/swift/linux/
 #
 # Tests that DT_RUNPATH is correct for the Swift stdlib and other libraries on Linux.
-# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/libswiftCore.so | %{FileCheck} --check-prefix CHECK-CORE %s
+# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/%{linux_arch}/libswiftCore.so | %{FileCheck} --check-prefix CHECK-CORE %s
+# CHECK-CORE: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN{{[^/]}}
 # CHECK-CORE-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}:/usr/lib/swift/linux
 #
 # RUN: %{readelf} -d %{package_path}/usr/lib/libsourcekitdInProc.so | %{FileCheck} --check-prefix CHECK-SK %s
+# CHECK-SK: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN/swift/linux/
 # CHECK-SK-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}:/usr/lib/swift/linux
 #
-# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/libswiftRemoteMirror.so | %{FileCheck} --check-prefix CHECK-RM %s
+# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/%{linux_arch}/libswiftRemoteMirror.so | %{FileCheck} --check-prefix CHECK-RM %s
+# CHECK-RM: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN{{[^/]}}
 # CHECK-RM-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}:/usr/lib/swift/linux
 #
-# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/libswift_Differentiation.so | %{FileCheck} --check-prefix CHECK-SD %s
+# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/%{linux_arch}/libswift_Differentiation.so | %{FileCheck} --check-prefix CHECK-SD %s
+# CHECK-SD: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN{{[^/]}}
 # CHECK-SD-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}:/usr/lib/swift/linux
 #
-# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/libswiftGlibc.so | %{FileCheck} --check-prefix CHECK-SG %s
+# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/%{linux_arch}/libswiftGlibc.so | %{FileCheck} --check-prefix CHECK-SG %s
+# CHECK-SG: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN{{[^/]}}
 # CHECK-SG-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}:/usr/lib/swift/linux
 #
-# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/libswiftSwiftOnoneSupport.so | %{FileCheck} --check-prefix CHECK-SON %s
+# RUN: %{readelf} -d %{package_path}/usr/lib/swift/linux/%{linux_arch}/libswiftSwiftOnoneSupport.so | %{FileCheck} --check-prefix CHECK-SON %s
+# CHECK-SON: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}$ORIGIN{{[^/]}}
 # CHECK-SON-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}:/usr/lib/swift/linux
 #
 # RUN: %{readelf} -d %{package_path}/usr/lib/libswiftDemangle.so | %{FileCheck} --check-prefix CHECK-SDE %s