Re: gcd_1.c:188:13: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'

[Marc Glisse <marc.glisse@inria.fr>]

On Tue, 1 Feb 2022, Toon Moene wrote:

> I just ran a "ubsan" build on my x86_64-linux-gnu system.
>
> See: https://gcc.gnu.org/pipermail/gcc-testresults/2022-February/754454.html
>
> This is an interesting failure:
>
> Executing on host: 
> /home/toon/scratch/bld1142336/gcc/testsuite/gfortran29/../../gfortran 
> -B/home/toon/scratch/bld1142336/gcc/testsuite/gfortran29/../../ 
> -B/home/toon/scratch/bld1142336/x86_64-pc-linux-gnu/./libgfortran/ 
> /home/toon/compilers/gcc/gcc/testsuite/gfortran.dg/graphite/pr39516.f 
> -fdiagnostics-plain-output  -fdiagnostics-plain-output    -O  -O2 
> -ftree-loop-linear -S -o pr39516.s    (timeout = 300)
> spawn -ignore SIGHUP 
> /home/toon/scratch/bld1142336/gcc/testsuite/gfortran29/../../gfortran 
> -B/home/toon/scratch/bld1142336/gcc/testsuite/gfortran29/../../ 
> -B/home/toon/scratch/bld1142336/x86_64-pc-linux-gnu/./libgfortran/ 
> /home/toon/compilers/gcc/gcc/testsuite/gfortran.dg/graphite/pr39516.f 
> -fdiagnostics-plain-output -fdiagnostics-plain-output -O -O2 
> -ftree-loop-linear -S -o pr39516.s
> gcd_1.c:188:13: runtime error: shift exponent 64 is too large for 64-bit type 
> 'long unsigned int'
> FAIL: gfortran.dg/graphite/pr39516.f   -O  (test for excess errors)
> Excess errors:
> gcd_1.c:188:13: runtime error: shift exponent 64 is too large for 64-bit type 
> 'long unsigned int'
>
> Note that the test case is pure Fortran source. The undefined error seems to 
> come from a function inside the graphite library ...

Maybe try with a more recent version of GMP first? gcd_1.c has only 103 
lines in release 6.2.1.

A stack trace (UBSAN_OPTIONS=print_stacktrace=1) would make it easier to 
guess where this is coming from.

-- 
Marc Glisse