Xcode 3.2.6/4.0 assembler bug?
Xcode 3.2.6/4.0 assembler bug?
- Subject: Xcode 3.2.6/4.0 assembler bug?
- From: Jack Howarth <email@hidden>
- Date: Sat, 12 Mar 2011 19:50:41 -0500
It appears that the assembler in Xcode 3.2.6/4.0 now blindly enforces
the 255 limit on sections regardless of whether any of those sections actually
contain symbols. This has unfortunately broken the darwin LTO support added
to FSF gcc 4.6.0 so any users wanting to use that will have to stick with
Xcode 3.2.5. I've filed this as radar Problem ID: 9126174, "Xcode assembler
restricts number of GNU_LTO sections". Looking at the failing testcases
like...
as -arch i386 -force_cpusubtype_ALL -o builtin-attr-1.o builtin-attr-1.s
,when compiled with Xcode 3.2.5, using MachOView shows all of the _GUN_LTO
sections containing only the intermediate GIMPLE code used for LTO and no
symbols. It is really quite unfortunate that a year's work on LTO is
rendered useless in this way. It will likely require a major rewrite of how
LTO is handled on darwin which likely won't happen until FSF gcc 4.7.
Jack
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