[Bug lto/43467] LTO error "bytecode stream: trying to read 0 bytes after the end of the input buffer"

["rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #2 from rguenth at gcc dot gnu dot org  2010-04-24 20:23 -------
With -fipa-cp -flto -fuse-linker-plugin -Wl,--allow-multiple-definition,
but gold does not know --allow-multiple-definition and thus I get

> gcc-4.5 1.c 2.c -fipa-cp -flto -fuse-linker-plugin
/usr/bin/gold: error: /tmp/ccLqKKQ3.o: multiple definition of f
/usr/bin/gold: error: /tmp/ccgya79G.o: previous definition here
lto1: internal compiler error: bytecode stream: trying to read 0 bytes after
the end of the input buffer

which simply means that we do not properly detect gold exiting with an error.

With GNU ld and w/o -fuse-linker-plugin I see

$ ./xgcc -B. 2.c 1.c -fipa-cp -flto -Wl,--allow-multiple-definition
/tmp/ccedC6yL.o: In function `f':
2.c:(.text+0x7): undefined reference to `g'
2.c:(.text+0xf): undefined reference to `h'
collect2: ld returned 1 exit status

which means it "works" and we choose the wrong f() to succeed linking
and thus we never end up invoking lto1 (which is what should happen
in the gold case as well).

Yes, we _do_ invoke the linker before invoking lto1!


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-04-24 20:23:01
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43467