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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/107197] New: valgrind error in function same_line_p during
 build
Date: Sun, 09 Oct 2022 19:32:22 +0000
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X-Bugzilla-Version: 12.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107197

            Bug ID: 107197
           Summary: valgrind error in function same_line_p during build
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

I've just had a go at building gcc trunk with -O3 under valgrind and
I got the following error:

/home/dcb/gcc/working/./gcc/xgcc -B/home/dcb/gcc/working/./gcc/
-B/home/dcb/gcc/results.20221009.valgrind/x86_64-pc-linux-gnu/bin/
-B/home/dcb/gcc/results.20221009.valgrind/x86_64-pc-linux-gnu/lib/ -isystem
/home/dcb/gcc/results.20221009.valgrind/x86_64-pc-linux-gnu/include -isystem
/home/dcb/gcc/results.20221009.valgrind/x86_64-pc-linux-gnu/sys-include    =
-g
-O3 -O2 -g -O3 -DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-q=
ual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include  -I. -I. -I../.././gcc -I../../../trunk.git/libgcc
-I../../../trunk.git/libgcc/. -I../../../trunk.git/libgcc/../gcc
-I../../../trunk.git/libgcc/../include
-I../../../trunk.git/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT  -g0=
=20
-finhibit-size-directive -fno-inline -fno-exceptions
-fno-zero-initialized-in-bss -fno-toplevel-reorder -fno-tree-vectorize
-fbuilding-libgcc -fno-stack-protector    -I. -I. -I../.././gcc
-I../../../trunk.git/libgcc -I../../../trunk.git/libgcc/.
-I../../../trunk.git/libgcc/../gcc -I../../../trunk.git/libgcc/../include
-I../../../trunk.git/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT -o
crtendS.o -MT crtendS.o -MD -MP -MF crtendS.dep -fno-omit-frame-pointer
-fno-asynchronous-unwind-tables -fcf-protection -mshstk -fpic -c
../../../trunk.git/libgcc/crtstuff.c -DCRT_END -DCRTSTUFFS_O
=3D=3D107792=3D=3D Conditional jump or move depends on uninitialised value(=
s)
=3D=3D107792=3D=3D    at 0xD5004B: same_line_p (tree-cfg.cc:1160)
=3D=3D107792=3D=3D    by 0xD5004B: assign_discriminators (tree-cfg.cc:1224)
=3D=3D107792=3D=3D    by 0xD5004B: build_gimple_cfg (tree-cfg.cc:251)
=3D=3D107792=3D=3D    by 0xD5004B: execute_build_cfg (tree-cfg.cc:371)

$ egrep "^Config|^=3D=3D" mk.out=20
Configuring in x86_64-pc-linux-gnu/libgcc
=3D=3D107792=3D=3D Conditional jump or move depends on uninitialised value(=
s)

So the problem occurs when building libgcc. Configure command is

../trunk.git/configure --prefix=3D/home/dcb/gcc/$PREFIX \
        --disable-bootstrap \
        --disable-multilib \
        --disable-werror \
        --with-pkgversion=3D$HASH \
        --enable-checking=3Dvalgrind \
        --enable-languages=3Dc,c++

and to get -O3 into it, I have

sed 's/-O2/-O3/' < Makefile > Makefile.tmp
diff Makefile Makefile.tmp
mv Makefile.tmp Makefile

for the top-level Makefile.=