[llvm-bugs] [Bug 46787] New: clang crashes in lib/Support/Unix/Signals.inc:544:0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46787

            Bug ID: 46787
           Summary: clang crashes in lib/Support/Unix/Signals.inc:544:0
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tangyixuan at mail.dlut.edu.cn
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The compiler crashes with a segmentation fault compiling the s.C. gcc succeeds.

$ cat s.C

#define ONE     if (0) { }
#define TEN     ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE
#define HUN     TEN TEN TEN TEN TEN TEN TEN TEN TEN TEN
#define THOU    HUN HUN HUN HUN HUN HUN HUN HUN HUN HUN
#define TTHOU   THOU THOU THOU THOU THOU THOU THOU THOU THOU
void foo()
{
  if (1) { 
    TTHOU TTHOU
  }
}

$ clang++ -v
clang version 10.0.0 (https://github.com/llvm/llvm-project.git
722b61892454b3217d73ec486e52156c5a92b5b3)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin

$ clang++ -c s.C
oscar at oscar-optimal:/media/oscar/xuaner1$ clang++ -c s.C
Stack dump:
0.      Program arguments: /usr/local/bin/clang-9 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
s.C -mrelocation-model static -mthread-model posix -mframe-pointer=all
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb
-resource-dir /usr/local/lib/clang/10.0.0 -internal-isystem
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../include/c++/9.2.0
-internal-isystem
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../include/c++/9.2.0/x86_64-pc-linux-gnu
-internal-isystem
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../include/c++/9.2.0/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/local/lib/clang/10.0.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdeprecated-macro
-fdebug-compilation-dir /media/oscar/xuaner1 -ferror-limit 19 -fmessage-length
0 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -faddrsig -o s.o -x c++ s.C 
1.      s.C:9:9 <Spelling=s.C:1:26>: current parser token '0'
2.      s.C:7:1: parsing function body 'foo'
3.      s.C:7:1: in compound statement ('{}')
  #0 0x00005645bc29e05f llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/home/oscar/compiler/llvm-project/llvm/lib/Support/Unix/Signals.inc:544:0
  #1 0x00005645bc29e0f2 PrintStackTraceSignalHandler(void*)
/home/oscar/compiler/llvm-project/llvm/lib/Support/Unix/Signals.inc:605:0

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