toolchain/53139: -fstack-check causes build error in mail/thunderbird

[Thomas Klausner <wiz%NetBSD.org@localhost>]

>Number:         53139
>Category:       toolchain
>Synopsis:       -fstack-check causes build problem in mail/thunderbird
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 28 14:10:00 +0000 2018
>Originator:     Thomas Klausner
>Release:        NetBSD 8.99.14
>Organization:
Curiosity is the very basis of education and if you tell me that 
curiosity killed the cat, I say only that the cat died nobly.
- Arnold Edinborough
>Environment:
	
	
Architecture: x86_64
Machine: amd64
>Description:
When adding PKGSRC_USE_STACK_CHECK=yes to /etc/mk.conf, mail/thunderbird stops building:

In file included from /scratch/mail/thunderbird/work/build/layout/generic/Unified_cpp_layout_generic1.cpp:11:0:
/scratch/mail/thunderbird/work/thunderbird-52.6.0/mozilla/layout/generic/nsBlockFrame.cpp: In member function 'virtual nscoord nsBlockFrame::GetMinISize(nsRenderingContext*)':
/scratch/mail/thunderbird/work/thunderbird-52.6.0/mozilla/layout/generic/nsBlockFrame.cpp:704:1: internal compiler error: in refs_may_alias_p_1, at tree-ssa-alias.c:1429
 nsBlockFrame::GetMinISize(nsRenderingContext *aRenderingContext)
 ^~~~~~~~~~~~
no stack trace because unwind library not available
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://www.NetBSD.org/support/send-pr.html> for instructions.

security/tor-browser is affected in the same way.
>How-To-Repeat:
echo 'PKGSRC_USE_STACK_CHECK=yes' >> /etc/mk.conf
cd /usr/pkgsrc/mail/thunderbird
make package

>Fix:

>Unformatted: