Hi Richard, Catherine, Matthew On Thu, 2017-03-02 14:40:46 +0100, Richard Biener <rguent...@suse.de> wrote: [...] > On IRC we decided to wait&see for the TREE_NO_WARNING issue. So the > following is what I committed. > > Bootstrapped / tested on x86_64-unknown-linux-gnu. [...] > 2017-03-02 Richard Biener <rguent...@suse.de> > > PR tree-optimization/79345 > PR c++/42000 > * tree-ssa-alias.c (walk_aliased_vdefs_1): Take a limit > param and abort the walk, returning -1 if it is hit. > (walk_aliased_vdefs): Take a limit param and pass it on. > * tree-ssa-alias.h (walk_aliased_vdefs): Add a limit param, > defaulting to 0 and return a signed int. > * tree-ssa-uninit.c (struct check_defs_data): New struct. > (check_defs): New helper. > (warn_uninitialized_vars): Use walk_aliased_vdefs to warn > about uninitialized memory. > > * fixed-value.c (fixed_from_string): Use ulow/uhigh to avoid > bogus uninitialized warning. > (fixed_convert_from_real): Likewise. > > * g++.dg/warn/Wuninitialized-7.C: New testcase. > * c-c++-common/ubsan/bounds-2.c: Add -Wno-uninitialized. > * gcc.dg/uninit-pr19430-2.c: Add expected warning.
When building with config-list.mk, it seems to break for all of the
listed MIPS targets, but not on any other architecture:
[...]
g++ -fno-PIE -c -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-fno-common -DHAVE_CONFIG_H -I. -I.
-I/scratch/4/jbglaw/configlist/repos/gcc/gcc
-I/scratch/4/jbglaw/configlist/repos/gcc/gcc/.
-I/scratch/4/jbglaw/configlist/repos/gcc/gcc/../include
-I/scratch/4/jbglaw/configlist/repos/gcc/gcc/../libcpp/include
-I/opt/cfarm/mpc/include
-I/scratch/4/jbglaw/configlist/repos/gcc/gcc/../libdecnumber
-I/scratch/4/jbglaw/configlist/repos/gcc/gcc/../libdecnumber/dpd
-I../libdecnumber -I/scratch/4/jbglaw/configlist/repos/gcc/gcc/../libbacktrace
-o mips.o -MT mips.o -MMD -MP -MF ./.deps/mips.TPo
/scratch/4/jbglaw/configlist/repos/gcc/gcc/config/mips/mips.c
In file included from
/scratch/4/jbglaw/configlist/repos/gcc/gcc/hash-table.h:236:0,
from
/scratch/4/jbglaw/configlist/repos/gcc/gcc/coretypes.h:369,
from
/scratch/4/jbglaw/configlist/repos/gcc/gcc/config/mips/mips.c:26:
/scratch/4/jbglaw/configlist/repos/gcc/gcc/vec.h: In function
‘mips_multi_member* mips_multi_add()’:
/scratch/4/jbglaw/configlist/repos/gcc/gcc/vec.h:865:3: error: ‘empty’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
*slot = obj;
^
/scratch/4/jbglaw/configlist/repos/gcc/gcc/vec.h: In function ‘void
mips_process_sync_loop(rtx_insn*, rtx_def**)’:
/scratch/4/jbglaw/configlist/repos/gcc/gcc/vec.h:865:3: error: ‘empty’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
*slot = obj;
^
/scratch/4/jbglaw/configlist/repos/gcc/gcc/vec.h:865:3: error: ‘empty’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
*slot = obj;
^
/scratch/4/jbglaw/configlist/repos/gcc/gcc/vec.h:865:3: error: ‘empty’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
*slot = obj;
^
/scratch/4/jbglaw/configlist/repos/gcc/gcc/config/mips/mips.c: In function
‘bool mips_expand_vec_perm_const(rtx_def**)’:
/scratch/4/jbglaw/configlist/repos/gcc/gcc/config/mips/mips.c:21362:10: error:
‘orig_perm’ may be used uninitialized in this function
[-Werror=maybe-uninitialized]
memcpy (d.perm, orig_perm, MAX_VECT_LEN);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
make[2]: *** [mips.o] Error 1
See eg. all the most recent builds:
mips64el-st-linux-gnu:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=699675
mips64orion-elf:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=699678
mipsisa32r2-linux-gnu:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=699702
mipsisa32-elfoabi:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=699701
mipsisa64sb1-elf:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=699724
mipsisa64sr71k-elf:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=699726
mips-netbsd:
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=699750
MfG, JBG
--
Jan-Benedict Glaw jbg...@lug-owl.de +49-172-7608481
Signature of: God put me on earth to accomplish a certain number of
the second : things. Right now I am so far behind I will never die.
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