[Bug lto/41756] New: LTO: -flto -O1 -use-linker-plugin, linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[Bug lto/41756] New: LTO: -flto -O1 -use-linker-plugin, linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[edwintorok at gmail dot com]

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$ /home/edwin/inst/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/home/edwin/inst/bin/g++
COLLECT_LTO_WRAPPER=/home/edwin/inst/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure --enable-lto --enable-languages=c,c++
--enable-gold
Thread model: posix
gcc version 4.5.0 20091019 (experimental) (GCC)

sh -x script
+ /home/edwin/inst/bin/g++ -fPIC SourceMgr.i -flto -fno-exceptions -O1 -c -o
SourceMgr.o
+ /home/edwin/inst/bin/g++ -fPIC AsmMatcherEmitter.i -flto -O1 -c -o
AsmMatcher.o
+ /home/edwin/inst/bin/g++ -flto -use-linked-plugin -O1 AsmMatcher.o
SourceMgr.o -shared
In function ‘EmitIsSubclass’:
lto1: error: BB 14 can not throw but has an EH edge
lto1: error: BB 15 can not throw but has an EH edge
lto1: error: BB 16 can not throw but has an EH edge
lto1: error: BB 18 can not throw but has an EH edge
lto1: error: BB 19 can not throw but has an EH edge
lto1: error: BB 20 can not throw but has an EH edge
lto1: error: BB 22 can not throw but has an EH edge
lto1: error: BB 23 can not throw but has an EH edge
lto1: error: BB 25 can not throw but has an EH edge
lto1: error: BB 26 can not throw but has an EH edge
lto1: error: BB 27 can not throw but has an EH edge
lto1: error: BB 30 can not throw but has an EH edge
lto1: internal compiler error: verify_flow_info failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /home/edwin/inst/bin/g++ returned 1 exit status
collect2: lto-wrapper returned 1 exit status


-- 
           Summary: LTO: -flto -O1 -use-linker-plugin, linking files
                    compiled with -fno-exceptions with ones compiled with
                    exceptions yields error "BB 14 can not throw but has an
                    EH edge"
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: edwintorok at gmail dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 -use-linker-plugin, linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[edwintorok at gmail dot com]

------- Comment #1 from edwintorok at gmail dot com  2009-10-19 16:55 -------
Created an attachment (id=18827)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18827&action=view)
SourceMgr.i

preprocessed SourceMgr.i


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 -use-linker-plugin, linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[edwintorok at gmail dot com]

------- Comment #2 from edwintorok at gmail dot com  2009-10-19 16:56 -------
Created an attachment (id=18828)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18828&action=view)
AsmMatcherEmitter.i.bz2

bzipped preprocessed AsmMatcherEmitter.i


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 -use-linker-plugin, linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[edwintorok at gmail dot com]

------- Comment #3 from edwintorok at gmail dot com  2009-10-19 16:58 -------
ld -v
GNU gold (GNU Binutils for Debian 2.20) 1.9

This happens only if I use all of -flto -O1 -use-linker-plugin, not using -O1,
or not using -use-linker-plugin hides the bug (and not using -flto too of
course).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 -use-linker-plugin, linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[edwintorok at gmail dot com]

------- Comment #4 from edwintorok at gmail dot com  2009-10-19 16:59 -------
(In reply to comment #3)
> ld -v
> GNU gold (GNU Binutils for Debian 2.20) 1.9
> 
> This happens only if I use all of -flto -O1 -use-linker-plugin, not using -O1,
> or not using -use-linker-plugin hides the bug (and not using -flto too of
> course).
> 

Actually -use-linker-plugin makes no difference


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 -use-linker-plugin, linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[steven at gcc dot gnu dot org]

------- Comment #5 from steven at gcc dot gnu dot org  2009-10-19 17:34 -------
You can't merge no-exception and exception code, it seems.  Should exceptions
be enabled per-function for LTO?


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dnovillo at gcc dot gnu dot
                   |                            |org, hubicka at gcc dot gnu
                   |                            |dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-10-19 17:34:08
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2009-10-20 09:35 -------
Even that would be difficult - how would you inline between such functions?
I think the only way is to force -fexceptions during the link stage if one
translation unit did have it enabled.  The -fno-exception TUs should have
all stmts marked as not throwing.

Sort of, but well - this is a very low priority bug.  (Falls into the
class of "different flags used for compiling and linking")

I'll try a very simple hack.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|LTO: -flto -O1 -use-linker- |LTO: -flto -O1 linking files
                   |plugin, linking files       |compiled with -fno-
                   |compiled with -fno-         |exceptions with ones
                   |exceptions with ones        |compiled with exceptions
                   |compiled with exceptions    |yields error "BB 14 can not
                   |yields error "BB 14 can not |throw but has an EH edge"
                   |throw but has an EH edge"   |
            Version|unknown                     |4.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[hubicka at gcc dot gnu dot org]

------- Comment #7 from hubicka at gcc dot gnu dot org  2009-12-11 11:39 -------
I would vote for LTO frotnend simply sorrying when seeing units with and
without exceptions.

Honza


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756

[Bug lto/41756] LTO: -flto -O1 linking files compiled with -fno-exceptions with ones compiled with exceptions yields error "BB 14 can not throw but has an EH edge"

[rguenth at gcc dot gnu dot org]

------- Comment #8 from rguenth at gcc dot gnu dot org  2009-12-11 12:16 -------
I wonder if we should simply ignore -fno-exceptions/-fexceptions passed to
lto1 and rely on the automated discovery.

The testcase btw works for me on i?86.

The proposed patch would delete handling of OPT_fexceptions from
register_user_option_p and add flag_exceptions = 0 to lto_init_options
in case you can still reproduce the issue.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756