[Bug bootstrap/41691] New: -flto leads to bootstrap failure

[Bug bootstrap/41691] New: -flto leads to bootstrap failure

[linuxl4 at sohu dot com]

trunk r152694

CFLAGS="-march=atom -mfpmath=sse -mveclibabi=svml -pipe -O3 -flto"

When configure in libgcc, 

checking for x86_64-unknown-linux-gnu-gcc... /home/xhs/build/gcc/./gcc/xgcc
-B/home/xhs/build/gcc/./gcc/ -B/gcc-4.5/gcc/x86_64-unknown-linux-gnu/bin/
-B/gcc-4.5/gcc/x86_64-unknown-linux-gnu/lib/ -isystem
/gcc-4.5/gcc/x86_64-unknown-linux-gnu/include -isystem
/gcc-4.5/gcc/x86_64-unknown-linux-gnu/sys-include   
checking for suffix of object files... configure: error: in
`/home/xhs/build/gcc/x86_64-unknown-linux-gnu/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.


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           Summary: -flto leads to bootstrap failure
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: linuxl4 at sohu dot com
 GCC build triplet: x86_64-pc-linux
  GCC host triplet: x86_64-pc-linux
GCC target triplet: x86_64-pc-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41691

[Bug bootstrap/41691] -flto leads to bootstrap failure

[linuxl4 at sohu dot com]

------- Comment #1 from linuxl4 at sohu dot com  2009-10-13 02:42 -------
Created an attachment (id=18793)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18793&action=view)
config.log file


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41691

[Bug bootstrap/41691] -flto leads to bootstrap failure

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2009-10-13 09:42 -------
Well, you obviously would need a host compiler with LTO enabled:

cc1: error: LTO support has not been enabled in this configuration

or better use BOOT_CFLAGS and TARGET_CFLAGS, not CFLAGS.  Note you also
need to adjust BOOT_LDFLAGS and TARGET_LDFLAGS.  And note that bootstrap
with LTO is currently broken, see for example PR41598.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41691

[Bug bootstrap/41691] -flto leads to bootstrap failure

[linuxl4 at sohu dot com]

------- Comment #3 from linuxl4 at sohu dot com  2009-10-13 11:27 -------
thanks for your message above.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41691