[Bug middle-end/105533] UBSAN: gcc/expmed.cc:3272:26: runtime error: signed integer overflow: -9223372036854775808 - 1 cannot be represented in type 'long int'

[dcb314 at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105533

--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
Asan, most of the checking flags, fortran and the -march setting not required.

Current configure script is:

../trunk.20210101/configure \
        --disable-multilib \
        --disable-werror \
        --with-pkgversion=$HASH \
        --with-build-config=bootstrap-ubsan \
        --enable-checking=yes \
        --enable-languages=c,c++

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

>From the output of the bootstrap:

Configuring stage 2 in x86_64-pc-linux-gnu/libgcc
../../trunk.20210101/gcc/poly-int.h:1089:5: runtime error: left shift of
negative value -8
../../trunk.20210101/gcc/poly-int.h:1089:5: runtime error: left shift of
negative value -8
../../trunk.20210101/gcc/expmed.cc:3288:26: runtime error: signed integer
overflow: -9223372036854775808 - 1 cannot be represented in type 'long int'
Configuring stage 2 in x86_64-pc-linux-gnu/libgomp