From b3d166839c6f46b194a6e53dbed38c5a83cb6f65 Mon Sep 17 00:00:00 2001
From: Jakub Jirutka <jakub@jirutka.cz>
Date: Fri, 5 Jan 2024 01:26:40 +0100
Subject: [PATCH] feat: fail build if both tls-native and tls-rustls are
 enabled

---
 Cargo.toml | 2 +-
 README.md  | 8 ++++----
 src/lib.rs | 3 +++
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index e2a197419..4f9fe84ca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,7 +39,7 @@ default = ["tls-rustls"]
 cli = ["merge", "clap"]
 merge = ["dep:merge"]
 clap = ["dep:clap"]
-# The tls-* features should be treated as mutually exclusive.
+# tls-native and tls-rustls are mutually exclusive.
 tls-native = ["reqwest/native-tls"]
 tls-rustls = ["reqwest/rustls-tls-native-roots"]
 
diff --git a/README.md b/README.md
index ba279cfb7..c39bd6f7c 100644
--- a/README.md
+++ b/README.md
@@ -55,11 +55,11 @@ This crate exposes a few features for controlling dependency usage:
 - **clap** - Enables a dependency on the `clap` crate and enables parsing from
   the commandline. *This feature is disabled by default*.
 - **tls-native** - Builds with native TLS support (i.e. link against system TLS
-  library). This feature should be treated as mutually exclusive with
-  `tls-rustls`. *This features is disabled by default*.
+  library). *This feature is mutually exclusive with `tls-rustls` and it is
+  disabled by default*.
 - **tls-rustls** - Builds with Rustls support (i.e. with bundled TLS library).
-  This feature should be treated as mutually exclusive with `tls-native`. *This
-  feature is enabled by default*.
+  *This feature is mutually exclusive with `tls-native` and it is enabled by
+  default*.
 
 ## Examples
 
diff --git a/src/lib.rs b/src/lib.rs
index 04bda03e8..2f29097ca 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -139,6 +139,9 @@ This crate exposes a few features for controlling dependency usage.
 #![allow(rustdoc::private_intra_doc_links)]
 #![allow(clippy::needless_raw_string_hashes)]
 
+#[cfg(all(feature = "tls-native", feature = "tls-rustls "))]
+compile_error!("features \"tls-native\" and \"tls-rustls \" cannot be enabled at the same time. Please disable one of them.");
+
 pub(crate) mod archiver;
 pub(crate) mod backend;
 pub(crate) mod blob;