http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50676
Bug #: 50676
Summary: Partitioning may fail with presence of static
variables referring to function labels
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: hubi...@gcc.gnu.org
Noticed the bug while preparing -fno-topelvel-reorder patch for Andi.
With WIP version of patch I got following failure building Mozilla:
/tmp/ccPpJShB.ltrans29.ltrans.o:ccPpJShB.ltrans29.o:function
_ZZN2js9InterpretEP9JSContextPNS_10StackFrameENS_10InterpModeEE15normalJumpTable.7094572:
error: undefined reference to
+'.L79667'
/tmp/ccPpJShB.ltrans29.ltrans.o:ccPpJShB.ltrans29.o:function
_ZZN2js9InterpretEP9JSContextPNS_10StackFrameENS_10InterpModeEE15normalJumpTable.7094572:
error: undefined reference to
+'.L79668'
/tmp/ccPpJShB.ltrans29.ltrans.o:ccPpJShB.ltrans29.o:function
_ZZN2js9InterpretEP9JSContextPNS_10StackFrameENS_10InterpModeEE15normalJumpTable.7094572:
error: undefined reference to
+'.L79669'
/tmp/ccPpJShB.ltrans29.ltrans.o:ccPpJShB.ltrans29.o:function
_ZZN2js9InterpretEP9JSContextPNS_10StackFrameENS_10InterpModeEE15normalJumpTable.7094572:
error: undefined reference to
+'.L79670'
/tmp/ccPpJShB.ltrans29.ltrans.o:ccPpJShB.ltrans29.o:function
_ZZN2js9InterpretEP9JSContextPNS_10StackFrameENS_10InterpModeEE15normalJumpTable.7094572:
error: undefined reference to
+'.L79671'
We will need artificial testcase for that that is bit tricky because it
involves putting function into one partition and its local static variable into
another, but clearly ipa-reference is not recording the cases where address of
local label is taken and thus partitioning happily breaks such code.
Honza
