https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114698
Bug ID: 114698
Summary: dcfldd produces wrong sha256 sum on ppc64le and -O3
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: bergner at gcc dot gnu.org
Target Milestone: ---
Building the dcfldd v1.9.1 package on powerpc64le-linux when configured to use
-O3 produces an incorrect sha256 sum for GCC trunk, 13 and 12. GCC 11 and
earlier produces correct output. For example (-O3 trunk build):
bergner@ltcden2-lp1:dcfldd [v1.9.1]$ echo TestInput | ./src/dcfldd hash=sha256
TestInput
Total (sha256):
d627605bdee37e388a5c232dc407cb5cd287d27187d6787999ad3bb59d383e9a
0+1 records in
0+1 records out
...versus expected output from an -O2 trunk build:
bergner@ltcden2-lp1:dcfldd [v1.9.1]$ echo TestInput | ./src/dcfldd hash=sha256
TestInput
Total (sha256):
8021973df8498a650e444fd84c705d9168639a246bc6024066e4091b2b450da6
0+1 records in
0+1 records out
...and from sha256sum:
bergner@ltcden2-lp1:dcfldd-git [v1.9.1]$ echo TestInput | /usr/bin/sha256sum
8021973df8498a650e444fd84c705d9168639a246bc6024066e4091b2b450da6 -
Current steps to recreate:
git clone https://github.com/resurrecting-open-source-projects/dcfldd.git
cd dcfldd/
git checkout v1.9.1 -b v1.9.1
./autogen.sh
./configure CFLAGS="-O3"
make
echo TestInput | ./src/dcfldd hash=sha256
