708870 - Cannot compile Firefox with Clang: hidden symbol `_Unwind_Backtrace' isn't defined

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Christian Holler (:decoder)]

It seems like I can't build Firefox anymore with Clang. The build failure I get is:

../../xpcom/base/nsStackWalk.o: In function `NS_StackWalk':
/home/decoder/LangFuzz/mozilla-central-llvm/xpcom/base/nsStackWalk.cpp:1647: undefined reference to `_Unwind_Backtrace'
../../xpcom/base/nsStackWalk.o: In function `unwind_callback':
/home/decoder/LangFuzz/mozilla-central-llvm/xpcom/base/nsStackWalk.cpp:1624: undefined reference to `_Unwind_GetIP'
/usr/bin/ld.bfd.real: libxul.so: hidden symbol `_Unwind_Backtrace' isn't defined
/usr/bin/ld.bfd.real: final link failed: Bad value
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[5]: *** [libxul.so] Error 1


This seems to be related to this bug landing:

changeset:   81203:c9a74f4ee1f7
user:        Rafael Ávila de Espíndola
date:        Fri Dec 02 19:26:04 2011 -0500
summary:     Bug 696376 - Change how we find critical ranges so that it works on 10.6 too. r=dbaron.


Clang is a dependency of many static instrumentation tools (the most important one being address sanitizer), so it would be good if this could get fixed so I can continue working on Firefox+Asan.

Comment 1

[Rafael Ávila de Espíndola (:espindola) (not reading bugmail)]

What version of clang are you using? I also fixed a bug in clang recently about it not having a unwind.h.

Starting a fresh build to try to reproduce this.

Comment 2

[Rafael Ávila de Espíndola (:espindola) (not reading bugmail)]

Fixed in clang 146208. Thanks!

Comment 3

[Christian Holler (:decoder)]

Confirmed to fix the issue, thanks for the quick response!