[LLVMbugs] [Bug 23902] New: clang segfaults on undefined variable

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23902

            Bug ID: 23902
           Summary: clang segfaults on undefined variable
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: schopf.dan at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14498
  --> https://llvm.org/bugs/attachment.cgi?id=14498&action=edit
associated run script

Compiling the following simple C program makes clang segfault:

#include <math.h>
#include <stdio.h>

int main() {
  printf("%g", fabs(a));
  return 0;
}

Declaring a solves the problem.

# clang -v test.c

clang version 3.7.0 (68aba8badebea3aee8c39002ac01fa12d978747e)
(883d498abf4db0e059a1250147e07f4e9c47d9e3)
Target: x86_64-pc-linux-gnu
Thread model: posix
Selected GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2
 "/usr/bin/x86_64-pc-linux-gnu-clang-3.7" -cc1 -triple x86_64-pc-linux-gnu
-emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name
test.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -v -dwarf-column-info -resource-dir
/usr/bin/../lib/clang/3.7.0 -internal-isystem /usr/local/include
-internal-isystem /usr/bin/../lib/clang/3.7.0/include -internal-externc-isystem
/include -internal-externc-isystem /usr/include -fdebug-compilation-dir
/home/daniel/workspace -ferror-limit 19 -fmessage-length 191 -mstackrealign
-fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o
/tmp/test-d1dd8d.o -x c test.c
clang -cc1 version 3.7.0 based upon LLVM 3.7.0svn default target
x86_64-pc-linux-gnu
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/bin/../lib/clang/3.7.0/include
 /usr/include
End of search list.
x86_64-pc-linux-gnu-clang-3.7: error: unable to execute command: Segmentation
fault
x86_64-pc-linux-gnu-clang-3.7: error: clang frontend command failed due to
signal (use -v to see invocation)
clang version 3.7.0 (68aba8badebea3aee8c39002ac01fa12d978747e)
(883d498abf4db0e059a1250147e07f4e9c47d9e3)
Target: x86_64-pc-linux-gnu
Thread model: posix
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: PLEASE submit a bug report
to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source,
and associated run script.
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: /tmp/test-252330.c
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: /tmp/test-252330.sh
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: 

********************

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