android: Rust 1.82 increased min api level of 32-bit targets to 21

Author: taiki-e

README.md

@@ -306,13 +306,14 @@ For the `qemu-user` runner, see ["qemu-user runner" section for linux-gnu target
 | target | api level | host | runner | note |
 | ------ | --------- | ---- | ------ | ---- |
 | `aarch64-linux-android`         | 21 (default), 22-24, 26-33 [1] | x86_64 Linux | qemu-user                   |       |
-| `arm-linux-androideabi`         | 19 (default), 21-24, 26-33 [1] | x86_64 Linux | qemu-user                   |       |
-| `armv7-linux-androideabi`       | 19 (default), 21-24, 26-33 [1] | x86_64 Linux | qemu-user                   |       |
-| `i686-linux-android`            | 19 (default), 21-24, 26-33 [1] | x86_64 Linux | native (default), qemu-user |       |
-| `thumbv7neon-linux-androideabi` | 19 (default), 21-24, 26-33 [1] | x86_64 Linux | qemu-user                   |       |
+| `arm-linux-androideabi`         | 21 / 19 [2] (default), 21-24, 26-33 [1] | x86_64 Linux | qemu-user                   |       |
+| `armv7-linux-androideabi`       | 21 / 19 [2] (default), 21-24, 26-33 [1] | x86_64 Linux | qemu-user                   |       |
+| `i686-linux-android`            | 21 / 19 [2] (default), 21-24, 26-33 [1] | x86_64 Linux | native (default), qemu-user |       |
+| `thumbv7neon-linux-androideabi` | 21 / 19 [2] (default), 21-24, 26-33 [1] | x86_64 Linux | qemu-user                   |       |
 | `x86_64-linux-android`          | 21 (default), 22-24, 26-33 [1] | x86_64 Linux | native (default), qemu-user |       |
 
 [1] This action currently uses the API level 24 system image, so `cargo test` and `cargo run` may not work on API level 26+.
+[2]: [21 on Rust 1.82+](https://github.com/rust-lang/rust/pull/120593), otherwise 19.
 
 You can select/pin the API level version by using `@` syntax in `target` option. For example:
 

main.sh

@@ -55,6 +55,11 @@ fi
 target="${INPUT_TARGET:?}"
 runner="${INPUT_RUNNER:-}"
 
+host=$(rustc -vV | grep '^host:' | cut -d' ' -f2)
+rustc_version=$(rustc -vV | grep '^release:' | cut -d' ' -f2)
+rustc_minor_version="${rustc_version#*.}"
+rustc_minor_version="${rustc_minor_version%%.*}"
+
 if [[ "${target}" == *"@"* ]]; then
     case "${target}" in
         *-android*)
@@ -69,6 +74,13 @@ if [[ "${target}" == *"@"* ]]; then
 else
     # NB: Sync with readme.
     case "${target}" in
+        *-android*)
+            api_level=21
+            # https://github.com/rust-lang/rust/pull/120593 increased min api level of 32-bit targets to 21.
+            if [[ "${rustc_minor_version}" -lt 82 ]]; then
+                api_level=''
+            fi
+            ;;
         *-freebsd*)
             # FreeBSD have binary compatibility with previous releases.
             # Therefore, the default is the minimum supported version.
@@ -93,10 +105,6 @@ fi
 target_lower="${target//-/_}"
 target_lower="${target_lower//./_}"
 target_upper=$(tr '[:lower:]' '[:upper:]' <<<"${target_lower}")
-host=$(rustc -vV | grep '^host:' | cut -d' ' -f2)
-rustc_version=$(rustc -vV | grep '^release:' | cut -d' ' -f2)
-rustc_minor_version="${rustc_version#*.}"
-rustc_minor_version="${rustc_minor_version%%.*}"
 rustup_target_list=$(rustup target list | cut -d' ' -f1)
 
 install_apt_packages() {