From d84761457958316952dd9379c59ef2bb3f7bdbfb Mon Sep 17 00:00:00 2001
From: Trevor Arjeski <trevor.arjeski@crypto.com>
Date: Wed, 10 Aug 2022 10:55:09 +0300
Subject: [PATCH 1/3] Do not include iana-time-zone for sgx

In previous version chrono with default features built successfully on the sgx platform. Since `iana-time-zone` is not implemented for this platform, do not include it when `target_env = "sgx"`.
---
 Cargo.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 94adca3e72..b5b9820054 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,7 +45,7 @@ rkyv = {version = "0.7", optional = true}
 wasm-bindgen = { version = "0.2" }
 js-sys = { version = "0.3" } # contains FFI bindings for the JS Date API
 
-[target.'cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "solaris")))'.dependencies]
+[target.'cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "solaris", target_env = "sgx")))'.dependencies]
 iana-time-zone = { version = "0.1.41", optional = true }
 
 [target.'cfg(windows)'.dependencies]

From 24715f024626194a8dddc8b518c0a875b0dc66a8 Mon Sep 17 00:00:00 2001
From: Trevor Arjeski <trevor.arjeski@crypto.com>
Date: Wed, 10 Aug 2022 14:58:05 +0300
Subject: [PATCH 2/3] Add sgx build to CI

---
 .github/workflows/test.yml | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7c66f3a607..ed28d8a7c6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -86,6 +86,28 @@ jobs:
         run: cargo build --target thumbv6m-none-eabi --color=always
         working-directory: ./ci/core-test
 
+  intel_sgx:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install rust with fortanix sgx toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          target: x86_64-fortanix-unknown-sgx
+          override: true
+      - uses: Swatinem/rust-cache@v1
+
+      - name: Build sgx lib
+        run: cargo build --target x86_64-fortanix-unknown-sgx --color=always
+        working-directory: ./ci/core-test
+
   wasm:
     strategy:
       matrix:

From 6f9af6fc1a110ca508a9a6a11cbd687f3119078b Mon Sep 17 00:00:00 2001
From: Eric Sheppard <key3@eric.sheppard.cloud>
Date: Wed, 10 Aug 2022 22:51:43 +1000
Subject: [PATCH 3/3] set fallback feature in iana-time-zone depedency

---
 Cargo.toml               | 3 +--
 src/offset/local/unix.rs | 6 ------
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index b5b9820054..cc6d93c376 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,13 +40,12 @@ serde = { version = "1.0.99", default-features = false, optional = true }
 pure-rust-locales = { version = "0.5.2", optional = true }
 criterion = { version = "0.3", optional = true }
 rkyv = {version = "0.7", optional = true}
+iana-time-zone = { version = "0.1.41", optional = true, features = ["fallback"] }
 
 [target.'cfg(all(target_arch = "wasm32", not(any(target_os = "emscripten", target_os = "wasi"))))'.dependencies]
 wasm-bindgen = { version = "0.2" }
 js-sys = { version = "0.3" } # contains FFI bindings for the JS Date API
 
-[target.'cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "solaris", target_env = "sgx")))'.dependencies]
-iana-time-zone = { version = "0.1.41", optional = true }
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3.0", features = ["std", "minwinbase", "minwindef", "timezoneapi"], optional = true }
diff --git a/src/offset/local/unix.rs b/src/offset/local/unix.rs
index ab91dfde38..46845b69d4 100644
--- a/src/offset/local/unix.rs
+++ b/src/offset/local/unix.rs
@@ -103,12 +103,6 @@ const TZDB_LOCATION: &str = " /system/usr/share/zoneinfo";
 #[cfg(not(target_os = "android"))]
 const TZDB_LOCATION: &str = "/usr/share/zoneinfo";
 
-#[cfg(any(target_os = "emscripten", target_os = "wasi", target_os = "solaris"))]
-fn fallback_timezone() -> Option<TimeZone> {
-    Some(TimeZone::utc())
-}
-
-#[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "solaris")))]
 fn fallback_timezone() -> Option<TimeZone> {
     let tz_name = iana_time_zone::get_timezone().ok()?;
     let bytes = fs::read(format!("{}/{}", TZDB_LOCATION, tz_name)).ok()?;