Fix CI setup

.github/workflows/ci.yml

@@ -0,0 +1,125 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+  # Faster compilation and error on warnings
+  RUSTFLAGS: "-C debuginfo=0 -D warnings"
+
+jobs:
+  fmt:
+    name: Check formatting
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Check formatting
+      uses: actions-rs/cargo@v1
+      with:
+        command: fmt
+        args: -- --check
+
+  test:
+    name: Test
+    strategy:
+      matrix:
+        platform:
+          - { os: ubuntu-latest } # TODO: 32bit and gcc-multilib
+          - { os: macos-10.15 }
+          - { os: macos-11    }
+          # - { target: x86_64-apple-ios,         os: macos-latest, }
+          # - { target: aarch64-apple-ios,        os: macos-latest, }
+
+    runs-on: ${{ matrix.platform.os }}
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Cache Rust
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.cargo/
+          target/
+        key: ${{ matrix.platform.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+        restore-keys: |
+          ${{ matrix.platform.os }}-cargo-
+
+    - name: Install Packages
+      if: contains(matrix.platform.os, 'ubuntu')
+      run: sudo apt-get install gobjc clang make
+
+    - name: Install different Rust toolchain
+      # A default toolchain is already installed
+      if: matrix.platform.target
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        target: ${{ matrix.platform.target }}
+        profile: minimal
+        override: true
+
+    - name: Check documentation
+      uses: actions-rs/cargo@v1
+      with:
+        # TODO: Disallow warnings here
+        command: doc
+        args: --no-deps --document-private-items
+
+    - # Run before we install GNUStep as a "fail fast" mechanism
+      name: Run checks
+      uses: actions-rs/cargo@v1
+      with:
+        command: check
+        args: --verbose
+
+    - name: Install GNUStep libobjc2
+      if: contains(matrix.platform.os, 'ubuntu')
+      run: |
+        wget https://github.com/gnustep/libobjc2/archive/refs/tags/v1.9.tar.gz
+        tar -xzf v1.9.tar.gz
+        mkdir libobjc2-1.9/build
+        cd libobjc2-1.9/build
+        export CC="clang"
+        export CXX="clang++"
+        cmake ../
+        sudo make install
+
+    - name: Install GNUStep make
+      if: contains(matrix.platform.os, 'ubuntu')
+      run: |
+        wget https://github.com/gnustep/tools-make/archive/refs/tags/make-2_9_0.tar.gz
+        tar -xzf make-2_9_0.tar.gz
+        cd tools-make-make-2_9_0
+        ./configure --with-library-combo=ng-gnu-gnu
+        sudo make install
+
+    - name: Install GNUStep-Base
+      if: contains(matrix.platform.os, 'ubuntu')
+      run: |
+        wget https://github.com/gnustep/libs-base/archive/refs/tags/base-1_28_0.tar.gz
+        tar -xzf base-1_28_0.tar.gz
+        cd libs-base-base-1_28_0
+        ./configure --disable-tls
+        sudo make install
+
+    - name: Setup environment
+      if: contains(matrix.platform.os, 'ubuntu')
+      run: |
+        ls -al /usr/local/lib
+        ls -al /usr/local/include
+        echo "LIBRARY_PATH=/usr/local/lib:$LIBRARY_PATH" >> $GITHUB_ENV
+        echo "LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH" >> $GITHUB_ENV
+        echo "CPATH=/usr/local/include:$CPATH" >> $GITHUB_ENV
+
+    - name: Build and run tests
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        # TODO: `objc/exception` feature is broken in objc_foundation
+        # TODO: `objc_foundation/block` feature doesn't work on GNUStep
+        args: --verbose --no-fail-fast --no-default-features

.travis-disabled.yml

@@ -0,0 +1,45 @@
+sudo: false
+language: rust
+cache: cargo
+os: osx
+
+# Run on master and PRs
+if: branch = master
+
+script:
+- cargo test --workspace --verbose
+- # TODO: cargo test --workspace --verbose --all-features
+
+jobs:
+  include:
+  - name: MacOS 10.11
+    osx_image: xcode7.3
+
+  - name: MacOS 10.13 (with 32bit)
+    osx_image: xcode9.4
+    rust: nightly
+    # 32-bit targets only have tier 3 support
+    install: rustup component add rust-src
+    script:
+    - cargo test --workspace --verbose
+    - # TODO: cargo test --workspace --verbose --all-features
+    - # objc_exception doesn't work on 32bit?
+      cargo test --workspace --exclude objc_exception --verbose -Z build-std --target i686-apple-darwin
+    - # TODO: cargo test --workspace --verbose --all-features -Z build-std --target i686-apple-darwin
+
+  - name: MacOS 11.3
+    osx_image: xcode12.5
+
+  - name: iOS nightly
+    osx_image: xcode7.3
+    rust: nightly
+    before_install: rustup component add rust-src
+    # Install rust-test-ios
+    install: curl -LO https://github.com/SSheldon/rust-test-ios/releases/download/0.1.1/rust-test-ios && chmod +x rust-test-ios
+    before_script:
+      # Enable -Z build-std, 32-bit targets only have tier 3 support
+      - printf '[unstable]\nbuild-std = ["std"]\n' > $HOME/.cargo/config.toml
+      # Remove workspace since `rust-test-ios` is not made for that
+      - rm Cargo.toml
+    # TODO: env: FEATURES="exception"
+    script: cd objc && ../rust-test-ios

Cargo.toml

@@ -6,3 +6,4 @@ members = [
     "objc_foundation",
     "objc_id",
 ]
+exclude = ["objc/tests-ios"]

objc/Cargo.toml

@@ -15,8 +15,6 @@ exclude = [
     ".gitignore",
     ".travis.yml",
     "doc.sh",
-    "travis_install.sh",
-    "travis_test.sh",
     "tests-ios/**",
 ]
 

objc/tests-ios/prelude.rs

@@ -1,3 +1,6 @@
+#[macro_use]
+extern crate objc;
+
 use objc::rc::*;
 use objc::runtime::*;
 pub use objc::*;

objc_exception/build.rs

@@ -1,5 +1,6 @@
 fn main() {
     cc::Build::new()
         .file("extern/exception.m")
+        .flag("-fobjc-exceptions")
         .compile("libexception.a");
 }

objc_exception/extern/exception.m

@@ -1,20 +1,17 @@
-#include <objc/objc.h>
-#include <objc/NSObject.h>
-
-void RustObjCExceptionThrow(id exception) {
-    @throw exception;
-}
+// Always available in Objective-C
+// See https://clang.llvm.org/docs/AutomaticReferenceCounting.html#arc-runtime-objc-retain
+id objc_retain(id value);
 
 int RustObjCExceptionTryCatch(void (*try)(void *), void *context, id *error) {
     @try {
         try(context);
         if (error) {
-            *error = nil;
+            *error = (id)0; // nil
         }
         return 0;
     } @catch (id exception) {
         if (error) {
-            *error = [exception retain];
+            *error = objc_retain(exception);
         }
         return 1;
     }

objc_exception/src/lib.rs

@@ -5,10 +5,17 @@ use std::os::raw::{c_int, c_void};
 use std::ptr;
 
 #[link(name = "objc", kind = "dylib")]
-extern "C" {}
+// TODO: "C-unwind"
+extern "C" {
+    /// See [`objc-exception.h`][objc-exception].
+    ///
+    /// [objc-exception]: https://opensource.apple.com/source/objc4/objc4-818.2/runtime/objc-exception.h.auto.html
+    // Header marks this with _Nonnull, but LLVM output shows otherwise
+    fn objc_exception_throw(exception: *mut c_void) -> !;
+    // fn objc_exception_rethrow();
+}
 
 extern "C" {
-    fn RustObjCExceptionThrow(exception: *mut c_void);
     fn RustObjCExceptionTryCatch(
         r#try: extern "C" fn(*mut c_void),
         context: *mut c_void,
@@ -26,9 +33,14 @@ pub enum Exception {}
 ///
 /// This unwinds from Objective-C, and the exception must be caught using an
 /// Objective-C exception handler.
+///
+/// This also invokes undefined behaviour until `C-unwind` is stabilized, see
+/// [RFC-2945].
+///
+/// [RFC-2945]: https://rust-lang.github.io/rfcs/2945-c-unwind-abi.html
+#[inline]
 pub unsafe fn throw(exception: *mut Exception) -> ! {
-    RustObjCExceptionThrow(exception as *mut _);
-    unreachable!();
+    objc_exception_throw(exception as *mut _)
 }
 
 unsafe fn try_no_ret<F>(closure: F) -> Result<(), *mut Exception>

objc_foundation/Cargo.toml

@@ -12,7 +12,10 @@ license = "MIT"
 
 exclude = [".gitignore"]
 
+[features]
+default = ["block"]
+
 [dependencies]
-block = "0.1"
+block = { optional = true, version = "0.1" }
 objc = { path = "../objc", version = "0.2.7" }
 objc_id = { path = "../objc_id", version = "0.1" }

objc_foundation/src/data.rs

@@ -1,9 +1,9 @@
-use std::mem;
 use std::ops::Range;
 use std::os::raw::c_void;
 use std::slice;
 
 use super::{INSCopying, INSMutableCopying, INSObject, NSRange};
+#[cfg(feature = "block")]
 use block::{Block, ConcreteBlock};
 use objc::msg_send;
 use objc_id::Id;
@@ -39,6 +39,7 @@ pub trait INSData: INSObject {
         }
     }
 
+    #[cfg(feature = "block")]
     fn from_vec(bytes: Vec<u8>) -> Id<Self> {
         let capacity = bytes.capacity();
         let dealloc = ConcreteBlock::new(move |bytes: *mut c_void, len: usize| unsafe {
@@ -56,7 +57,7 @@ pub trait INSData: INSObject {
             let obj: *mut Self = msg_send![obj, initWithBytesNoCopy:bytes_ptr
                                                              length:bytes.len()
                                                         deallocator:dealloc];
-            mem::forget(bytes);
+            std::mem::forget(bytes);
             Id::from_retained_ptr(obj)
         }
     }
@@ -192,6 +193,7 @@ mod tests {
         assert!(data.bytes() == [8, 17]);
     }
 
+    #[cfg(feature = "block")]
     #[test]
     fn test_from_vec() {
         let bytes = vec![3, 7, 16];