[Bug middle-end/61354] New: GCC bootstrap with LTO fails in trunk when built with isl

[Bug middle-end/61354] New: GCC bootstrap with LTO fails in trunk when built with isl

[venkataramanan.kumar at amd dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61354

            Bug ID: 61354
           Summary: GCC bootstrap with LTO fails in trunk when built with
                    isl
           Product: gcc
           Version: lto
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: venkataramanan.kumar at amd dot com

Machine: AMD64
Revision tested: trunk 210955

sources/gcc-fsf/gcc/configure
--prefix=/work/builds/lto-native-bootstrap-install-trunk
--with-build-config=bootstrap-lto

make -j4 


(Snip)
../../../sources/gcc-fsf/gcc/isl/isl_map_simplify.c: In function
âisl_basic_map_drop_redundant_divsâ:
../../../sources/gcc-fsf/gcc/isl/isl_map_simplify.c:3046:19: error: âlast_negâ
may be used uninitialized in this function [-Werror=maybe-uninitialized]
         bmap->ineq[last_neg] + 1,
                   ^
../../../sources/gcc-fsf/gcc/isl/isl_map_simplify.c:3007:17: note: âlast_negâ
was declared here
   int last_pos, last_neg;
                 ^
../../../sources/gcc-fsf/gcc/isl/isl_map_simplify.c:3062:9: error: âlast_posâ
may be used uninitialized in this function [-Werror=maybe-uninitialized]
        !ok_to_set_div_from_bound(bmap, i, last_pos)) {
         ^
../../../sources/gcc-fsf/gcc/isl/isl_map_simplify.c:3007:7: note: âlast_posâ
was declared here
   int last_pos, last_neg;
(Snip)
>From gcc-bugs-return-452794-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 29 11:00:56 2014
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From: "kuehro at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/61309] cilk-plus tests fail with: hidden symbol `__cpu_model' in /x/gcc/testsuite/g++/../../libgcc.a(cpuinfo.o) is referenced by DSO
Date: Thu, 29 May 2014 11:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida309

Kai-Uwe Eckhardt <kuehro at gmx dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kuehro at gmx dot de

--- Comment #1 from Kai-Uwe Eckhardt <kuehro at gmx dot de> ---
In NetBSD pkgsrc this was fixed by the following patch (with
 --prefix=/usr/pkg/gcc410snapshot ):

--- libcilkrts/configure.orig    2014-03-26 19:16:35.000000000 +0000
+++ libcilkrts/configure
@@ -14496,7 +14496,7 @@ rm -f core conftest.err conftest.$ac_obj
     conftest$ac_exeext conftest.$ac_ext

 if test $enable_shared = yes; then
-  link_cilkrts="-lcilkrts %{static: $LIBS}"
+  link_cilkrts="-rpath /usr/pkg/gcc410snapshot/lib --as-needed -lgcc_s
-lcilkrts %{static $LIBS}"
 else
   link_cilkrts="-lcilkrts $LIBS"
 fi


The libgcc_s.so from /usr/lib is used where the symbol __cpu_model is missing.

Good luck,

Kai-Uwe

[Bug middle-end/61354] GCC bootstrap with LTO fails in trunk when built with isl

[mkuvyrkov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61354

Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |mkuvyrkov at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #1 from Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> ---
./contrib/download_prerequisites should be run at the top-level directory of
GCC source.  If run inside ./gcc/ sources of supporting libraries will be
treated with same strict requirement as GCC code.

Closing as INVALID.

[Bug middle-end/61354] GCC bootstrap with LTO fails in trunk when built with isl

[venkataramanan.kumar at amd dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61354

--- Comment #2 from Venkataramanan <venkataramanan.kumar at amd dot com> ---
Maxim, 

"sources/gcc-fsf/gcc" is the top level source directory and it contains the
contrib folder.

gcc compiler sources are in "sources/gcc-fsf/gcc/gcc".

[Bug middle-end/61354] GCC bootstrap with LTO fails in trunk when built with isl

[venkataramanan.kumar at amd dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61354

Venkataramanan <venkataramanan.kumar at amd dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at ucw dot cz

--- Comment #3 from Venkataramanan <venkataramanan.kumar at amd dot com> ---
I am closing this PR since it seems to be problem with ISL code. The bug occurs
while building stage 1 "cc1" via link time optimizer "lto1" and now compiler is
detecting uninitialized code in ISL.

During bootstrap compiler treats all warnings as errors.

[Bug middle-end/61354] GCC bootstrap with LTO fails in trunk when built with isl

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61354

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
When doing LTO bootstrap it's wise to add --disable-werror.