[petsc-dev] how to solve this problem?

[yym]

txdy827 at ubuntu:~/software/petsc-3.8.4/src/snes/impls/ngmres$ make
make[1]: Warning: Archive '/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a' seems to have been created in deterministic mode. 'snesngmres.o' will always be updated. Please consider passing the U flag to ar to avoid the problem.




/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/bin/mpicc -o snesngmres.o -c -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -fstack-protector -fvisibility=hidden -g -O   -I/home/txdy827/software/petsc-3.8.4/include -I/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/include    `pwd`/snesngmres.c
/usr/bin/ar cr /home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a snesngmres.o
if test -n ""; then /usr/bin/ar cr  snesngmres.lo; fi
/bin/rm -f snesngmres.o snesngmres.lo
make[1]: Warning: Archive '/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a' seems to have been created in deterministic mode. 'snesngmres.o' will always be updated. Please consider passing the U flag to ar to avoid the problem.
make[1]: Warning: Archive '/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a' seems to have been created in deterministic mode. 'ngmresfunc.o' will always be updated. Please consider passing the U flag to ar to avoid the problem.
/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/bin/mpicc -o ngmresfunc.o -c -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -fstack-protector -fvisibility=hidden -g -O   -I/home/txdy827/software/petsc-3.8.4/include -I/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/include    `pwd`/ngmresfunc.c
/usr/bin/ar cr /home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a ngmresfunc.o
if test -n ""; then /usr/bin/ar cr  ngmresfunc.lo; fi
/bin/rm -f ngmresfunc.o ngmresfunc.lo
make[1]: Warning: Archive '/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a' seems to have been created in deterministic mode. 'ngmresfunc.o' will always be updated. Please consider passing the U flag to ar to avoid the problem.
make[1]: Warning: Archive '/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a' seems to have been created in deterministic mode. 'anderson.o' will always be updated. Please consider passing the U flag to ar to avoid the problem.
/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/bin/mpicc -o anderson.o -c -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -fstack-protector -fvisibility=hidden -g -O   -I/home/txdy827/software/petsc-3.8.4/include -I/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/include    `pwd`/anderson.c
/usr/bin/ar cr /home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a anderson.o
if test -n ""; then /usr/bin/ar cr  anderson.lo; fi
/bin/rm -f anderson.o anderson.lo
make[1]: Warning: Archive '/home/txdy827/software/petsc-3.8.4/arch-linux2-cxx-debug/lib/libpetsc.a' seems to have been created in deterministic mode. 'anderson.o' will always be updated. Please consider passing the U flag to ar to avoid the problem.







thank you for your help!
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