[Bug target/60179] New: [4.9 Regression] target optimization attribute streaming is broken

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60179

            Bug ID: 60179
           Summary: [4.9 Regression] target optimization attribute
                    streaming is broken
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: lto
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
            Target: x86_64-*-*, i?86-*-*

Since somewhen recently the i386 target started to put pointers to strings in
struct cl_target_option (TargetSaves in i386.opt).  This breaks LTO streaming
of TS_TARGET_OPTION which streams the contents of cl_target_option
byte-for-byte.

For me this results in a LTO bootstrap comparison failure when comparing
stage2/libccp/lex.o and stage3/libcpp/lex.o.

And it obviously will make the backend crash if anybody would ever inspect
one of those streamed string pointers (well, or they'll point somewhere
random and not so useful).