https://llvm.org/bugs/show_bug.cgi?id=26040
Bug ID: 26040
Summary: clang crashes on autoconf test involving #pragma weak
Product: clang
Version: 3.4
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: fuz...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
This bug has also been reported to the FreeBSD bug tracker [1] and could be
reproduced on amd64 Ubuntu 14.04. Further analysis (as described on the “how to
submit” page) shows that the bug occurs in the frontend.
The following very short C program triggers a bug in /usr/bin/cc (Clang 3.4.1)
on amd64 FreeBSD 10.2-RELEASE:
extern int test2();
#pragma weak test2 = test1
int test1() {return 0;}
int main() {
return test2();
; return 0; }
This program is used as a configure test in the Schily utilities, it's supposed
to test if the compiler correctly supports SysV #pragma weak, though it's not
supposed to induce a compiler crash. The output of /usr/bin/cc is:
Stack dump:
0. Program arguments: /usr/bin/cc -cc1 -triple
x86_64-unknown-freebsd10.2 -emit-obj -mrelax-all -disable-free
-disable-llvm-verifier -main-file-name clang-bug.c -mrelocation-model static
-mdisable-fp-elim -masm-verbose -mconstructor-aliases -munwind-tables
-target-cpu x86-64 -coverage-file /tmp/clang-bug.o -resource-dir
/usr/bin/../lib/clang/3.4.1 -fdebug-compilation-dir /tmp -ferror-limit 19
-fmessage-length 0 -mstackrealign -fobjc-runtime=gnustep
-fdiagnostics-show-option -vectorize-slp -o clang-bug.o -x c clang-bug.c
1. clang-bug.c:5:14: current parser token ')'
2. clang-bug.c:4:12: parsing function body 'main'
3. clang-bug.c:4:12: in compound statement ('{}')
cc: error: unable to execute command: Segmentation fault (core dumped)
cc: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: x86_64-unknown-freebsd10.2
Thread model: posix
cc: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed
source, and associated run script.
cc: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
cc: note: diagnostic msg: /tmp/clang-bug-60a5bb.c
cc: note: diagnostic msg: /tmp/clang-bug-60a5bb.sh
cc: note: diagnostic msg:
********************
[1]: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205934
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