Linux Armv5 Support

ColemanCDA · March 28, 2022, 2:13am

I was able to get a functional Swift 5.5.3 toolchain for ARMv5.

Bug:
https://bugs.swift.org/browse/SR-15944

PRs:

github.com/apple/swift

[stdlib] Added Armv5 support

apple:main ← MillerTechnologyPeru:feature/armv5-trunk

opened 06:20AM - 05 Mar 22 UTC

colemancda

+25 -5

Added support for cross compiling the Swift Stdlib for Armv5 processors. Reso…lves [SR-15944](https://bugs.swift.org/browse/SR-15944).

Patches:

gist.github.com

https://gist.github.com/colemancda/e2f00ab2e4226b0543fb2f332c47422e

RefCount.h.diff

diff --git a/stdlib/public/SwiftShims/RefCount.h b/stdlib/public/SwiftShims/RefCount.h
index 5c8211f5e9f..fe54839aaae 100644
--- a/stdlib/public/SwiftShims/RefCount.h
+++ b/stdlib/public/SwiftShims/RefCount.h
@@ -1319,7 +1319,12 @@ class HeapObjectSideTableEntry {
 
   public:
   HeapObjectSideTableEntry(HeapObject *newObject)
-    : object(newObject), refCounts()
+    : object(newObject),

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gist.github.com

https://gist.github.com/colemancda/ded1de5b1b84a5b84a13c2433b9001a7

swift-5.5.3-armv5.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a3cc3af07a..d99fbc56348 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -285,7 +285,7 @@ set(SWIFT_ANDROID_DEPLOY_DEVICE_PATH "" CACHE STRING
 #
 
 foreach(sdk ANDROID;FREEBSD;LINUX;WINDOWS;HAIKU;WASI)
-  foreach(arch aarch64;armv6;armv7;i686;powerpc64;powerpc64le;s390x;wasm32;x86_64)
+  foreach(arch aarch64;armv5;armv6;armv7;i686;powerpc64;powerpc64le;s390x;wasm32;x86_64)

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gist.github.com

https://gist.github.com/colemancda/df87bab835f431f6b02ea9c795dffcd7

swift-driver-5.5.3-armv5.patch

diff --git a/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift b/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
index 93eceb72..030a7714 100644
--- a/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
+++ b/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
@@ -40,6 +40,7 @@ extension GenericUnixToolchain {
     //       'armv6', so just take a brute-force approach
     if triple.archName.contains("armv7") { return "armv7" }
     if triple.archName.contains("armv6") { return "armv6" }
+    if triple.archName.contains("armv5") { return "armv5" }
     return triple.archName

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gist.github.com

https://gist.github.com/colemancda/d6c76ba759732eb78031c707777ae37d

swift-tools-support-core-5.5.3-armv5.patch

diff --git a/Sources/TSCUtility/Triple.swift b/Sources/TSCUtility/Triple.swift
index 449a21f..9a7df7b 100644
--- a/Sources/TSCUtility/Triple.swift
+++ b/Sources/TSCUtility/Triple.swift
@@ -42,6 +42,8 @@ public struct Triple: Encodable, Equatable {
         case s390x
         case aarch64
         case armv7
+        case armv6
+        case armv5

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ColemanCDA · March 28, 2022, 2:46am

Swift 5.6 PRs:

github.com/apple/swift

[stdib] Added Armv5 support

apple:release/5.6 ← MillerTechnologyPeru:swift-5.6/armv5

opened 02:44AM - 28 Mar 22 UTC

colemancda

+26 -29

Backported https://github.com/apple/swift/pull/41686 for Swift 5.6 release. … Resolves [SR-15944](https://bugs.swift.org/browse/SR-15944).

Swift 5.6 Patches:

gist.github.com

https://gist.github.com/colemancda/087209552b6568cbaec432fd4514f465

swift-5.6-armv5.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bc9b6790922..5c15bc7048b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -713,6 +713,8 @@ 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")

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gist.github.com

https://gist.github.com/colemancda/8ebdd4eb03cbcb05798bf98b7dbcfa4f

swift-driver-5.6-armv5.patch

diff --git a/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift b/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
index 98ecb4e1..4f66e89b 100644
--- a/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
+++ b/Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift
@@ -44,6 +44,7 @@ extension GenericUnixToolchain {
     //       'armv6', so just take a brute-force approach
     if triple.archName.contains("armv7") { return "armv7" }
     if triple.archName.contains("armv6") { return "armv6" }
+    if triple.archName.contains("armv5") { return "armv5" }
     return triple.archName

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gist.github.com

https://gist.github.com/colemancda/c117f49231902c926b59be9c2630d9d2

swift-tools-support-core-5.6-armv5.patch

diff --git a/Sources/TSCUtility/Triple.swift b/Sources/TSCUtility/Triple.swift
index 0b682c8..5f2dbd3 100644
--- a/Sources/TSCUtility/Triple.swift
+++ b/Sources/TSCUtility/Triple.swift
@@ -45,6 +45,8 @@ public struct Triple: Encodable, Equatable {
         case aarch64
         case amd64
         case armv7
+        case armv6
+        case armv5

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hggz · March 28, 2022, 2:50am

You're just knocking out all these compile patches left and right aren't you?

ColemanCDA · March 28, 2022, 2:51am

@hggz what can I say, I really want Swift on OpenWRT routers and my iMac G4.

ColemanCDA · March 28, 2022, 4:45am

Here is a downloadable toolchain for Debian 11 (arm64)

ColemanCDA · March 28, 2022, 5:10am

Buildroot patch

gist.github.com

https://gist.github.com/colemancda/e2d7923b51697edec61c0004dfece150

swift-buildroot.patch

diff --git a/package/Config.in b/package/Config.in
index 0d5d763180..b89a49913e 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -1422,6 +1422,7 @@ menu "Crypto"
 	source "package/openssl/Config.in"
 	source "package/pkcs11-helper/Config.in"
 	source "package/rhash/Config.in"
+	source "package/swift-crypto/Config.in"
 	source "package/tinydtls/Config.in"

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Buildroot configuration

gist.github.com

https://gist.github.com/colemancda/6cf77d988b5207c35c54e595c69ad776

swift-armv5-buildroot-config

#
# Automatically generated file; DO NOT EDIT.
# Buildroot 2022.02-398-gd5745888fa Configuration
#
BR2_HAVE_DOT_CONFIG=y
BR2_HOST_GCC_AT_LEAST_4_9=y
BR2_HOST_GCC_AT_LEAST_5=y
BR2_HOST_GCC_AT_LEAST_6=y
BR2_HOST_GCC_AT_LEAST_7=y
BR2_HOST_GCC_AT_LEAST_8=y

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mickeyl · March 28, 2022, 5:55am

That‘s great news! I hope the patches can make it into upstream.