diff --git a/CMakeLists.txt b/CMakeLists.txt
index 327aa16240343..293f2c1cf8a97 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -741,6 +741,8 @@ else()
     set(SWIFT_HOST_VARIANT_ARCH_default "powerpc64le")
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "s390x")
     set(SWIFT_HOST_VARIANT_ARCH_default "s390x")
+  elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "armv5|armv5te")
+    set(SWIFT_HOST_VARIANT_ARCH_default "armv5")
   # FIXME: Only matches v6l/v7l - by far the most common variants
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv6l")
     set(SWIFT_HOST_VARIANT_ARCH_default "armv6")
diff --git a/cmake/modules/AddSwift.cmake b/cmake/modules/AddSwift.cmake
index baeedd1b14e74..6d93e52f1d5bd 100644
--- a/cmake/modules/AddSwift.cmake
+++ b/cmake/modules/AddSwift.cmake
@@ -344,7 +344,7 @@ function(_add_host_variant_link_flags target)
     target_link_libraries(${target} PRIVATE
       pthread
       dl)
-    if("${SWIFT_HOST_VARIANT_ARCH}" MATCHES "armv6|armv7|i686")
+    if("${SWIFT_HOST_VARIANT_ARCH}" MATCHES "armv5|armv6|armv7|i686")
       target_link_libraries(${target} PRIVATE atomic)
     endif()
   elseif(SWIFT_HOST_VARIANT_SDK STREQUAL FREEBSD)
diff --git a/cmake/modules/AddSwiftUnittests.cmake b/cmake/modules/AddSwiftUnittests.cmake
index 54a3138bec743..4b9dcf11197b3 100644
--- a/cmake/modules/AddSwiftUnittests.cmake
+++ b/cmake/modules/AddSwiftUnittests.cmake
@@ -37,7 +37,7 @@ function(add_swift_unittest test_dirname)
     if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|AMD64")
       target_compile_options(${test_dirname} PRIVATE
         -march=core2)
-    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "armv6|armv7|i686")
+    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "armv5|armv6|armv7|i686")
       set_property(TARGET "${test_dirname}" APPEND PROPERTY LINK_LIBRARIES
         "atomic")
     endif()
diff --git a/cmake/modules/SwiftConfigureSDK.cmake b/cmake/modules/SwiftConfigureSDK.cmake
index 3c866f2e65c92..103f1296fad5f 100644
--- a/cmake/modules/SwiftConfigureSDK.cmake
+++ b/cmake/modules/SwiftConfigureSDK.cmake
@@ -323,7 +323,9 @@ macro(configure_sdk_unix name architectures)
       endif()
 
       if("${prefix}" STREQUAL "LINUX")
-        if(arch MATCHES "(armv6|armv7)")
+        if(arch MATCHES "(armv5)")
+          set(SWIFT_SDK_LINUX_ARCH_${arch}_TRIPLE "${arch}-unknown-linux-gnueabi")
+        elseif(arch MATCHES "(armv6|armv7)")
           set(SWIFT_SDK_LINUX_ARCH_${arch}_TRIPLE "${arch}-unknown-linux-gnueabihf")
         elseif(arch MATCHES "(aarch64|i686|powerpc64|powerpc64le|s390x|x86_64)")
           set(SWIFT_SDK_LINUX_ARCH_${arch}_TRIPLE "${arch}-unknown-linux-gnu")
diff --git a/cmake/modules/SwiftSetIfArchBitness.cmake b/cmake/modules/SwiftSetIfArchBitness.cmake
index fa29d77fe26ee..74a43e3334364 100644
--- a/cmake/modules/SwiftSetIfArchBitness.cmake
+++ b/cmake/modules/SwiftSetIfArchBitness.cmake
@@ -9,6 +9,7 @@ function(set_if_arch_bitness var_name)
   if("${SIA_ARCH}" STREQUAL "i386" OR
      "${SIA_ARCH}" STREQUAL "i686" OR
      "${SIA_ARCH}" STREQUAL "x86" OR
+     "${SIA_ARCH}" STREQUAL "armv5" OR
      "${SIA_ARCH}" STREQUAL "armv6" OR
      "${SIA_ARCH}" STREQUAL "armv7" OR
      "${SIA_ARCH}" STREQUAL "armv7k" OR
diff --git a/lib/Basic/Platform.cpp b/lib/Basic/Platform.cpp
index 141655332d80b..47759ba6b8e25 100644
--- a/lib/Basic/Platform.cpp
+++ b/lib/Basic/Platform.cpp
@@ -218,6 +218,8 @@ StringRef swift::getMajorArchitectureName(const llvm::Triple &Triple) {
       return "armv7";
     case llvm::Triple::SubArchType::ARMSubArch_v6:
       return "armv6";
+    case llvm::Triple::SubArchType::ARMSubArch_v5:
+      return "armv5";
     default:
       break;
     }
diff --git a/lib/IDE/Utils.cpp b/lib/IDE/Utils.cpp
index 021d1f65d5342..0dde804cdc448 100644
--- a/lib/IDE/Utils.cpp
+++ b/lib/IDE/Utils.cpp
@@ -400,6 +400,10 @@ static std::string adjustClangTriple(StringRef TripleStr) {
     OS << "armv6k"; break;
   case llvm::Triple::SubArchType::ARMSubArch_v6t2:
     OS << "armv6t2"; break;
+  case llvm::Triple::SubArchType::ARMSubArch_v5:
+    OS << "armv5"; break;
+  case llvm::Triple::SubArchType::ARMSubArch_v5te:
+    OS << "armv5te"; break;
   default:
     // Adjust i386-macosx to x86_64 because there is no Swift stdlib for i386.
     if ((Triple.getOS() == llvm::Triple::MacOSX ||
diff --git a/stdlib/cmake/modules/AddSwiftStdlib.cmake b/stdlib/cmake/modules/AddSwiftStdlib.cmake
index a750cdc896a08..bd6f19ef07fb5 100644
--- a/stdlib/cmake/modules/AddSwiftStdlib.cmake
+++ b/stdlib/cmake/modules/AddSwiftStdlib.cmake
@@ -418,7 +418,7 @@ function(_add_target_variant_link_flags)
     MACCATALYST_BUILD_FLAVOR  "${LFLAGS_MACCATALYST_BUILD_FLAVOR}")
   if("${LFLAGS_SDK}" STREQUAL "LINUX")
     list(APPEND link_libraries "pthread" "dl")
-    if("${LFLAGS_ARCH}" MATCHES "armv6|armv7|i686")
+    if("${LFLAGS_ARCH}" MATCHES "armv5|armv6|armv7|i686")
       list(APPEND link_libraries "atomic")
     endif()
   elseif("${LFLAGS_SDK}" STREQUAL "FREEBSD")
diff --git a/utils/build-script-impl b/utils/build-script-impl
index 355f1a086d86d..b3e80303fc06a 100755
--- a/utils/build-script-impl
+++ b/utils/build-script-impl
@@ -458,6 +458,7 @@ function verify_host_is_supported() {
       | haiku-x86_64            \
       | linux-x86_64            \
       | linux-i686              \
+      | linux-armv5             \
       | linux-armv6             \
       | linux-armv7             \
       | linux-aarch64           \
@@ -551,6 +552,10 @@ function set_build_options_for_host() {
                     ;;
             esac
             ;;
+        linux-armv5)
+            SWIFT_HOST_TRIPLE="armv5-unknown-linux-gnueabi"
+            llvm_target_arch="ARM"
+            ;;
         linux-armv6)
             SWIFT_HOST_TRIPLE="armv6-unknown-linux-gnueabihf"
             llvm_target_arch="ARM"
@@ -1105,7 +1110,7 @@ function false_true() {
 CROSS_COMPILE_HOSTS=($CROSS_COMPILE_HOSTS)
 for t in "${CROSS_COMPILE_HOSTS[@]}"; do
     case ${t} in
-        macosx* | iphone* | appletv* | watch* | linux-armv6 | linux-armv7 | android-* )
+        macosx* | iphone* | appletv* | watch* | linux-armv5 | linux-armv6 | linux-armv7 | android-* )
             ;;
         *)
             echo "Unknown host to cross-compile for: ${t}"
diff --git a/utils/swift_build_support/swift_build_support/targets.py b/utils/swift_build_support/swift_build_support/targets.py
index c5a86651bb869..bbdd22a755e3d 100644
--- a/utils/swift_build_support/swift_build_support/targets.py
+++ b/utils/swift_build_support/swift_build_support/targets.py
@@ -266,6 +266,7 @@ class StdlibDeploymentTarget(object):
     Linux = Platform("linux", archs=[
         "x86_64",
         "i686",
+        "armv5",
         "armv6",
         "armv7",
         "aarch64",
@@ -346,6 +347,9 @@ def host_target():
             elif machine.startswith('armv6'):
                 # linux-armv6* is canonicalized to 'linux-armv6'
                 return StdlibDeploymentTarget.Linux.armv6
+            elif machine.startswith('armv5'):
+                # linux-armv5* is canonicalized to 'linux-armv5'
+                return StdlibDeploymentTarget.Linux.armv5
             elif machine == 'aarch64':
                 return StdlibDeploymentTarget.Linux.aarch64
             elif machine == 'ppc64':