Open Radar

 
Summary:
command line llvm crashes when compiling source attached in crash.tgz as per direction by llvm

Steps to Reproduce:
c++ -Wno-unused -MP -MD -std=c++11 -g3 -ggdb -I. -c main.cpp -o main.o

Expected Results:
It shouldn't crash

Compiler output:
--- start ---
(neal@Neal-MBP3-55.local) 18:52:22
(553 / 53) [~/src/vs.git/t2]$: make
c++ -Wno-unused -MP -MD -std=c++11 -g3 -ggdb -I. -c main.cpp -o main.o
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-900.0.38)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.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/6r/cw6_jzqx32n9pq4rl5jy2wkw0000gn/T/main-32bc2f.cpp
clang: note: diagnostic msg: /var/folders/6r/cw6_jzqx32n9pq4rl5jy2wkw0000gn/T/main-32bc2f.sh
clang: note: diagnostic msg: Crash backtrace is located in
clang: note: diagnostic msg: /Users/neal/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:

********************
make: *** [main.o] Error 254

(neal@Neal-MBP3-55.local) 18:53:54
--- end ---


--- main.cpp ---
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dispatch/dispatch.h>
#include <functional>

class C1Sub
{
public: 
        C1Sub() {};
        virtual ~C1Sub() {};
};


class C1
{
public: 
        C1() {};
        virtual ~C1() {};

        C1Sub Sub(std::function<void()> fn) { return C1Sub(); };
};

class C2Item
{
public: 
        C2Item() {};
        virtual~C2Item() {};

        bool Test() const { return false; };
};

class C2
{
public: 
        C2() {};
        virtual ~C2() {};

        void Iterate(std::function<void(C2Item const &ifi)> fn) {};
};

C1 gHub;
C2 gIfi;

void test1()
{
        __block C1Sub c1sub = gHub.Sub([&]()
        {
                gIfi.Iterate(
                        [&](C2Item const &ifi)
                        {
                                // All is fine if there is no conditional flow logic interal to this block
                                // ie. if(), switch(), while(), for() 
                                if(ifi.Test()) // <<<----- comment this line to compile 
                                {
                                }
                        });
        });
}

int main(int argc, char **argv)
{
        test1();

        return 0;
}

--- end main.cpp ---