[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"

[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"

[pinskia at gcc dot gnu.org]

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

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
   Target Milestone|---                         |10.0
         Resolution|---                         |FIXED

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed for GCC 8 with r8-4560.
Though fixed fully with r10-3246.

[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

[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 #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