Open Radar

 
Summary:
Dear clangsters,

Would you like to make clang crash? I will tell you how. Compile the following program with ARC enabled.

    static void blockReceiver(void (^block)(id objects[])) {
        return;
    }

    static void blockSender() {
        blockReceiver(^(id objects[]){});
    }

    int main(int argc, const char * argv[]) {
        return 0;
    }

Love,
Rob


Steps to Reproduce:
1. Put the program shown above in a file `t.m`.

2. Compile the program with this command: 

    clang -fobjc-arc -c t.m



Expected Results:
Not crash.

Actual Results:
Crash.

    :; clang -fobjc-arc -c t.m
    t.m:1:44: error: must explicitly describe intended ownership of an object array parameter
    static void blockReceiver(void (^block)(id objects[])) {
                                               ^
    clang: error: unable to execute command: Segmentation fault: 11
    clang: error: clang frontend command failed due to signal (use -v to see invocation)
    Apple LLVM version 9.0.0 (clang-900.0.39.2)
    Target: x86_64-apple-darwin16.7.0
    Thread model: posix
    InstalledDir: /Applications/Xcode-9.2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
    clang: note: diagnostic msg: PLEASE submit a bug report to http://developer.apple.com/bugreporter/ and include the crash backtrace, preprocessed source, and associated run script.
    clang: note: diagnostic msg: 
    ********************
    
    PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
    Preprocessed source(s) and associated run script(s) are located at:
    clang: note: diagnostic msg: /var/folders/5j/b96_pfw966780pdmgh6fk4dc0000gn/T/t-3114d5.m
    clang: note: diagnostic msg: /var/folders/5j/b96_pfw966780pdmgh6fk4dc0000gn/T/t-3114d5.sh
    clang: note: diagnostic msg: Crash backtrace is located in
    clang: note: diagnostic msg: /Users/mayoff/Library/Logs/DiagnosticReports/clang_<YYYY-MM-DD-HHMMSS>_<hostname>.crash
    clang: note: diagnostic msg: (choose the .crash file that corresponds to your crash)
    clang: note: diagnostic msg: 
    
    ********************


Version:
Xcode Version 9.2 (9C40b) / macOS 10.12.6 (16G1212)

Notes: