[Bug bootstrap/50857] New: [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[Bug bootstrap/50857] New: [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

             Bug #: 50857
           Summary: [4.7 Regression] The compiler is built with exceptions
                    and RTTI enabled
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rguenth@gcc.gnu.org
                CC: iant@google.com


We fail to pass -fno-exceptions -fno-rtti to g++ for stage2 and stage3 building
the host binaries.  That leads to increased compile-time and possibly runtime.

Ian, does Go need exceptions or RTTI?

Any idea where to best fix this?

[Bug bootstrap/50857] [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.7.0

[Bug bootstrap/50857] [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

Ian Lance Taylor <ian at airs dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ian at airs dot com

--- Comment #1 from Ian Lance Taylor <ian at airs dot com> 2011-10-24 16:44:25 UTC ---
The Go frontend does not use exceptions or RTTI.

The place to add new C++-specific options to be used when building gcc code is
ALL_CXXFLAGS in gcc/Makefile.in.  The thing to be careful of is that that
Makefile variable is used for any C++ compiler.  Ideally there would be a
configure test to see whether the compiler supported the options.  This can be
done along the lines of ACX_PROG_CC_WARNING_OPTS in configure.ac.  In fact you
can probably just use ACX_PROG_CC_WARNING_OPTS despite the name.

[Bug bootstrap/50857] [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-10-27
     Ever Confirmed|0                           |1

[Bug bootstrap/50857] [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-10-28 13:08:10 UTC ---
Hm, well - I would rather unconditionally enable those options for stage2 and
3 (we know it'll be G++ at built) and leave them off for stage1.  Any way
to just influence stage2+?  Or would that be even more complicated?

[Bug bootstrap/50857] [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[iant at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

--- Comment #3 from iant at google dot com <iant at google dot com> 2011-10-28 13:56:23 UTC ---
I suppose you could drop something into POSTSTAGE1_FLAGS_TO_PASS.  But
it's not the right thing to do.  We want to use -fno-exceptions
-fno-rtti even when using --disable-bootstrap or when using
--enable-build-with-cxx.

[Bug bootstrap/50857] [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[matz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

--- Comment #4 from Michael Matz <matz at gcc dot gnu.org> 2011-11-03 17:17:11 UTC ---
Author: matz
Date: Thu Nov  3 17:17:07 2011
New Revision: 180833

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180833
Log:
libcpp/
    PR bootstrap/50857
    * configure.ac: Check for -fno-exceptions -fno-rtti.
    * configure: Regenerate.
    * Makefile.in (NOEXCEPTION_FLAGS): New flag.
    (ALL_CXXFLAGS): Use it.

gcc/
    PR bootstrap/50857
    * configure.ac: Check for -fno-exceptions -fno-rtti.
    * configure: Regenerate.
    * Makefile.in (NOEXCEPTION_FLAGS): New flag.
    (ALL_CXXFLAGS): Use it.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/Makefile.in
    trunk/gcc/configure
    trunk/gcc/configure.ac
    trunk/libcpp/ChangeLog
    trunk/libcpp/Makefile.in
    trunk/libcpp/configure
    trunk/libcpp/configure.ac

[Bug bootstrap/50857] [4.7 Regression] The compiler is built with exceptions and RTTI enabled

[matz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50857

Michael Matz <matz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |matz at gcc dot gnu.org
         Resolution|                            |FIXED

--- Comment #5 from Michael Matz <matz at gcc dot gnu.org> 2011-11-03 17:22:02 UTC ---
Fixed.