[patch] support LTO of transactional memory

[Jack Howarth]

On Tue, Nov 22, 2011 at 10:30:44AM -0800, Richard Henderson wrote:
> On 11/22/2011 09:55 AM, Aldy Hernandez wrote:
> > 	* opts.c (finish_options): Do not fail for -fgnu-tm.
> > 	* gimple-streamer-out.c (output_gimple_stmt): Handle GIMPLE_TRANSACTION.
> > 	* gimple-streamer-in.c (input_gimple_stmt): Same.
> > 	* lto-cgraph.c (input_overwrite_node): Read tm_clone bit.
> > 	(lto_output_node): Write tm_clone bit.
> > lto/
> > 	* lto-lang.c (lto_attribute_table): Handle transaction_pure.
> > 	(handle_transaction_pure_attribute): New.
> 
> Ok.
> 
> 
> r~

  On x86_64-apple-darwin11, we see the link-time failures...

FAIL: gcc.dg/lto/trans-mem-1 c_lto_trans-mem-1_0.o-c_lto_trans-mem-1_1.o link, -flto -fgnu-tm
FAIL: gcc.dg/lto/trans-mem-2 c_lto_trans-mem-2_0.o-c_lto_trans-mem-2_1.o link, -flto -fgnu-tm

at -m32/-m64. These fail as...

Executing on host: /sw/src/fink.build/gcc47-4.7.0-1/darwin_objdir/gcc/xgcc -B/sw/src/fink.build/gcc47-4.7.0-1/darwin_objdir/gcc/ c_lto_trans-mem-1_0.o c_lto_trans-mem-1_1.o   -flto
 -fgnu-tm       -m32 -o gcc-dg-lto-trans-mem-1-01.exe    (timeout = 300)
Undefined symbols for architecture i386:^M
  "__ITM_registerTMCloneTable", referenced from:^M
      ___doTMRegistrations in crttms.o^M
      ___doTMRegistrations in crttms.o^M
  "__ITM_deregisterTMCloneTable", referenced from:^M
      ___doTMdeRegistrations in crttme.o^M
      ___doTMdeRegistrations in crttme.o^M
ld: symbol(s) not found for architecture i386^M
collect2: error: ld returned 1 exit status^M
compiler exited with status 1
output is:
Undefined symbols for architecture i386:^M
  "__ITM_registerTMCloneTable", referenced from:^M
      ___doTMRegistrations in crttms.o^M
      ___doTMRegistrations in crttms.o^M  "__ITM_deregisterTMCloneTable", referenced from:^M
      ___doTMdeRegistrations in crttme.o^M
      ___doTMdeRegistrations in crttme.o^M
ld: symbol(s) not found for architecture i386^M
collect2: error: ld returned 1 exit status^M

FAIL: gcc.dg/lto/trans-mem-1 c_lto_trans-mem-1_0.o-c_lto_trans-mem-1_1.o link, -flto -fgnu-tm

Perhaps these are related to the run-time execution failures seen on i386 linux...

http://gcc.gnu.org/ml/gcc-testresults/2011-11/msg02303.html

FAIL: gcc.dg/lto/trans-mem-1 c_lto_trans-mem-1_0.o-c_lto_trans-mem-1_1.o execute -flto -fgnu-tm
FAIL: gcc.dg/lto/trans-mem-2 c_lto_trans-mem-2_0.o-c_lto_trans-mem-2_1.o execute -flto -fgnu-tm