[llvm-bugs] [Bug 26839] New: Clang -cc1 crashes if an unknown -target-cpu is passed for -triple arm

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26839

            Bug ID: 26839
           Summary: Clang -cc1 crashes if an unknown -target-cpu is passed
                    for -triple arm
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.cab+llvmbug at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Steps to Reproduce: 

touch main.c
clang -cc1 -triple arm -target-cpu xyz main.c -emit-obj

Actual Results:

The application crashed.

$ ./clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang -cc1 -triple
arm -target-cpu xyz main.c -emit-obj
#0 0x0000000001594268 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x1594268)
#1 0x00000000015948e7 SignalHandler(int)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x15948e7)
#2 0x00007f8c41763d10 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10d10)
#3 0x00007f8c40a3c8f0
/build/glibc-ryFjv0/glibc-2.21/string/../sysdeps/x86_64/multiarch/memcmp-sse4.S:878:0
#4 0x000000000156bff2 llvm::ARM::getCanonicalArchName(llvm::StringRef)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x156bff2)
#5 0x000000000156cc76 llvm::ARM::parseArchProfile(llvm::StringRef)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x156cc76)
#6 0x0000000002965a77 (anonymous
namespace)::ARMTargetInfo::setArchInfo(unsigned int)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x2965a77)
#7 0x0000000002962973 (anonymous
namespace)::ARMTargetInfo::setCPU(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x2962973)
#8 0x0000000002957183
clang::TargetInfo::CreateTargetInfo(clang::DiagnosticsEngine&,
std::shared_ptr<clang::TargetOptions> const&)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x2957183)
#9 0x000000000193056d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x193056d)
#10 0x00000000019d9b0f
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x19d9b0f)
#11 0x0000000000742b9d cc1_main(llvm::ArrayRef<char const*>, char const*,
void*)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x742b9d)
#12 0x0000000000741ed1 main
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x741ed1)
#13 0x00007f8c408eea40 __libc_start_main
/build/glibc-ryFjv0/glibc-2.21/csu/libc-start.c:323:0
#14 0x000000000073eeb9 _start
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x73eeb9)
Stack dump:
0.    Program arguments:
./clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang -cc1 -triple arm
-target-cpu xyz main.c -emit-obj 
Segmentation fault (core dumped)

Expected results:

No crash and print an error message.

Build Date & Platform: 

Clang 3.8.0-rc3 prebuilt binaries for Ubuntu 15.10 available at llvm.org.


Additional Information:

This is a regression with respect to clang 3.7.1.

Using clang 3.7.1 results in normal behaviour.

$ ./clang+llvm-3.7.1-x86_64-linux-gnu-ubuntu-15.10/bin/clang -cc1 -triple arm
-target-cpu xyz main.c -emit-obj
'xyz' is not a recognized processor for this target (ignoring processor)
[repeats 13 times]

$ ./clang+llvm-3.7.1-x86_64-linux-gnu-ubuntu-15.10/bin/clang -cc1 -target-cpu
xyz main.c -emit-obj
error: unknown target CPU 'xyz'

With clang 3.8.0-rc3 the results are expected for x86-64 but a crash for
-triple arm.

$ ./clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang -cc1
-target-cpu xyz main.c -emit-obj
error: unknown target CPU 'xyz' 

$ ./clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang -cc1 -triple
arm -target-cpu xyz main.c -emit-obj
#0 0x0000000001594268 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/score/clang+llvm-3.8.0-rc3-x86_64-linux-gnu-ubuntu-15.10/bin/clang-3.8+0x1594268)
[...]

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