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
