Bug 12578

Summary:	Alignment of a common symbol overridden by a definition
Product:	binutils	Reporter:	Dmitry Gorbachev <d.g.gorbachev>
Component:	ld	Assignee:	unassigned
Status:	RESOLVED INVALID
Severity:	normal
Priority:	P2
Version:	2.22
Target Milestone:	---
Host:		Target:
Build:		Last reconfirmed:
Attachments:	Testcase

Description Dmitry Gorbachev 2011-03-13 17:37:50 UTC

(I don't know is it related to / a duplicate of PR12564.)

ld.bfd gives a warning: "/usr/bin/ld: Warning: alignment 4 of symbol `baz' in /tmp/ccEJaaP0.o is smaller than 16 in /tmp/ccs1dDrt.o"; ld.gold doesn't even warn.

I think the linker should choose the largest alignment, as it already does when merging multiple common symbols.

Comment 1 Dmitry Gorbachev 2011-03-13 17:38:56 UTC

Created attachment 5303 [details]
Testcase

Compile it with GCC 4.5 or later and `-O3 -march=pentium3' options.

Comment 2 H.J. Lu 2011-03-14 13:48:29 UTC

Linker can change alignment of a common symbol. But
it can't change alignment of a definition.