From ebdd7eba767bd387570019e4cdd3ffd4d72ce3cb Mon Sep 17 00:00:00 2001
From: Gordon Ross <gordon.w.ross@gmail.com>
Date: Tue, 25 Aug 2026 16:49:16 -0400
Subject: [PATCH 1/2] update to illumos sysroot 20210501

---
 src/ci/docker/scripts/illumos-toolchain.sh | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/ci/docker/scripts/illumos-toolchain.sh b/src/ci/docker/scripts/illumos-toolchain.sh
index 7a3ca875554ae..411f93a21415c 100644
--- a/src/ci/docker/scripts/illumos-toolchain.sh
+++ b/src/ci/docker/scripts/illumos-toolchain.sh
@@ -47,11 +47,10 @@ GCC_BASE="gcc-$GCC_VERSION"
 GCC_TAR="gcc-$GCC_VERSION.tar.xz"
 GCC_URL="https://ftp.gnu.org/gnu/gcc/$GCC_BASE/$GCC_TAR"
 
-SYSROOT_VER='20181213-de6af22ae73b-v1'
-SYSROOT_SUM='ee792d956dfa6967453cebe9286a149143290d296a8ce4b8a91d36bea89f8112'
+SYSROOT_VER='20210501-e0b4275f34-v0'
+SYSROOT_SUM='28d8f4f6d84331ff1e99ac3d68b917cf8174897a5c00171c5e493253eb1587f6'
 SYSROOT_TAR="illumos-sysroot-$SYSROOT_MACH-$SYSROOT_VER.tar.gz"
-SYSROOT_URL='https://github.com/illumos/sysroot/releases/download/'
-SYSROOT_URL+="$SYSROOT_VER/$SYSROOT_TAR"
+SYSROOT_URL="https://github.com/illumos/sysroot/releases/download/$SYSROOT_VER/$SYSROOT_TAR"
 SYSROOT_DIR="$PREFIX/sysroot"
 
 BINUTILS_VERSION='2.40'

From e2feede1fd748cd848a36110cf79fdd9bdb38ce6 Mon Sep 17 00:00:00 2001
From: Gordon Ross <gordon.w.ross@gmail.com>
Date: Tue, 25 Aug 2026 22:05:23 +0000
Subject: [PATCH 2/2] Update plaform note

---
 src/doc/rustc/src/platform-support/illumos.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/doc/rustc/src/platform-support/illumos.md b/src/doc/rustc/src/platform-support/illumos.md
index c03238269d37a..cb500d245236b 100644
--- a/src/doc/rustc/src/platform-support/illumos.md
+++ b/src/doc/rustc/src/platform-support/illumos.md
@@ -40,3 +40,16 @@ The target supports C code.
 
 The illumos project makes available [prebuilt sysroot artefacts](https://github.com/illumos/sysroot) which can be used for cross compilation.
 The official Rust binaries are cross-compiled using these artefacts.
+
+## Target version requirements
+
+The host tools cross-compiled for this target should work on any
+illumos distribution based on illumos sources later than the
+date shown in the sysroot version tag.
+
+For details on illumos sysroot versions see:
+[sysroot versions](https://github.com/illumos/sysroot/releases)
+
+The actual sysroot version tag used is shown in the
+[illumos toolchain](../../../../ci/docker/scripts/illumos-toolchain.sh)
+script (see SYSROOT_VER).