[Bug lto/51698] New: [trans-mem] TM runtime and application with LTO

["patrick.marlier at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51698

             Bug #: 51698
           Summary: [trans-mem] TM runtime and application with LTO
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: patrick.marlier@gmail.com
                CC: aldyh@gcc.gnu.org, rth@gcc.gnu.org,
                    torvald@gcc.gnu.org


Created attachment 26198
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26198
testcase app-itm with lto

In my attempt to make _ITM_R/W* calls inlined into the application code, it
seems that the TM builtins and TM defintions don't work as expected with LTO.

$ gcc -flto -fgnu-tm -Wall -o bin appitm.c
`_ITM_beginTransaction' referenced in section `.text' of
/tmp/cc7uGSe1.ltrans0.ltrans.o: defined in discarded section `.text' of
/tmp/ccJk2crp.o (symbol from plugin)
`_ITM_RU4' referenced in section `.text' of /tmp/cc7uGSe1.ltrans0.ltrans.o:
defined in discarded section `.text' of /tmp/ccJk2crp.o (symbol from      
plugin)
`_ITM_commitTransaction' referenced in section `.text' of
/tmp/cc7uGSe1.ltrans0.ltrans.o: defined in discarded section `.text' of
/tmp/ccJk2crp.o (symbol from plugin)
collect2: error: ld returned 1 exit status

I have merged all .c in the same source for the testcase but it has the same
problem if TM runtime is in a library.

Patrick Marlier.