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And sometimes you might need to list these additional libraries/options after PETSc libraries - in the link command. One way:
balay@pj01:~/test$ cat makefile include ${PETSC_DIR}/lib/petsc/conf/variables include ${PETSC_DIR}/lib/petsc/conf/rules LDLIBS += -foobar balay@pj01:~/test$ make ex2 mpicxx -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -Wno-lto-type-mismatch -Wno-psabi -fstack-protector -fvisibility=hidden -g -O0 -I/home/balay/petsc/include -I/home/balay/petsc/arch-linux-c-debug/include ex2.cpp -Wl,-rpath,/home/balay/petsc/arch-linux-c-debug/lib -L/home/balay/petsc/arch-linux-c-debug/lib -Wl,-rpath,/software/mpich-4.1.1/lib -L/software/mpich-4.1.1/lib -Wl,-rpath,/usr/lib/gcc/x86_64-redhat-linux/13 -L/usr/lib/gcc/x86_64-redhat-linux/13 -lpetsc -llapack -lblas -ltriangle -lm -lX11 -lmpifort -lmpi -lgfortran -lm -lgfortran -lm -lgcc_s -lquadmath -lstdc++ -lquadmath -foobar -o ex2 g++: error: unrecognized command-line option ‘-foobar’ make: *** [<builtin>: ex2] Error 1 Satish On Tue, 9 Jul 2024, Satish Balay wrote: > It depends on your makefile - and how you are over-riding the targets. 1. Why add -rpath to CXXFLAGS, and not LDFLAGS? The following work for me with the default makefile format used by petsc examples > balay@ pj01: ~/test$ ls ex2. cpp makefile > ZjQcmQRYFpfptBannerStart > This Message Is From an External Sender > This message came from outside your organization. > > ZjQcmQRYFpfptBannerEnd > > It depends on your makefile - and how you are over-riding the targets. > > 1. Why add -rpath to CXXFLAGS, and not LDFLAGS? > > The following work for me with the default makefile format used by petsc examples > > balay@pj01:~/test$ ls > ex2.cpp makefile > balay@pj01:~/test$ cat makefile > > include ${PETSC_DIR}/lib/petsc/conf/variables > include ${PETSC_DIR}/lib/petsc/conf/rules > > balay@pj01:~/test$ make ex2 > mpicxx -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -Wno-lto-type-mismatch -Wno-psabi -fstack-protector -fvisibility=hidden -g -O0 -I/home/balay/petsc/include -I/home/balay/petsc/arch-lin > ux-c-debug/include ex2.cpp -Wl,-rpath,/home/balay/petsc/arch-linux-c-debug/lib -L/home/balay/petsc/arch-linux-c-debug/lib -Wl,-rpath,/software/mpich-4.1.1/lib -L/software/mpich-4.1.1/lib -Wl,-rpath,/usr > /lib/gcc/x86_64-redhat-linux/13 -L/usr/lib/gcc/x86_64-redhat-linux/13 -lpetsc -llapack -lblas -ltriangle -lm -lX11 -lmpifort -lmpi -lgfortran -lm -lgfortran -lm -lgcc_s -lquadmath -lstdc++ -lquadmath -o ex2 > balay@pj01:~/test$ make clean > balay@pj01:~/test$ make ex2 LDFLAGS=-foobar > mpicxx -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -Wno-lto-type-mismatch -Wno-psabi -fstack-protector -fvisibility=hidden -g -O0 -I/home/balay/petsc/include -I/home/balay/petsc/arch-lin > ux-c-debug/include -foobar ex2.cpp -Wl,-rpath,/home/balay/petsc/arch-linux-c-debug/lib -L/home/balay/petsc/arch-linux-c-debug/lib -Wl,-rpath,/software/mpich-4.1.1/lib -L/software/mpich-4.1.1/lib -Wl,-rpa > th,/usr/lib/gcc/x86_64-redhat-linux/13 -L/usr/lib/gcc/x86_64-redhat-linux/13 -lpetsc -llapack -lblas -ltriangle -lm -lX11 -lmpifort -lmpi -lgfortran -lm -lgfortran -lm -lgcc_s -lquadmath -lstdc++ -lquadmath > -o ex2 > g++: error: unrecognized command-line option ‘-foobar’ > make: *** [<builtin>: ex2] Error 1 > balay@pj01:~/test$ make ex2 CXXFLAGS=-foobar > mpicxx -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -Wno-lto-type-mismatch -Wno-psabi -fstack-protector -fvisibility=hidden -g -O0 -foobar -I/home/balay/petsc/include -I/home/balay/petsc/a > rch-linux-c-debug/include ex2.cpp -Wl,-rpath,/home/balay/petsc/arch-linux-c-debug/lib -L/home/balay/petsc/arch-linux-c-debug/lib -Wl,-rpath,/software/mpich-4.1.1/lib -L/software/mpich-4.1.1/lib -Wl,-rpa > th,/usr/lib/gcc/x86_64-redhat-linux/13 -L/usr/lib/gcc/x86_64-redhat-linux/13 -lpetsc -llapack -lblas -ltriangle -lm -lX11 -lmpifort -lmpi -lgfortran -lm -lgfortran -lm -lgcc_s -lquadmath -lstdc++ -lquadmath > -o ex2 > g++: error: unrecognized command-line option ‘-foobar’ > make: *** [<builtin>: ex2] Error 1 > balay@pj01:~/test$ > > Satish > > On Tue, 9 Jul 2024, Qiyue Lu wrote: > > > Hello, > > I am trying to compile a *.cpp code under PETSc environment. An additional > > flag is needed to link the metis partition library. > > ############## > > # This line is necessary for linking, remember need this flag in both > > compiler options and linking options > > LDFLAGS= -fopenmp -lpmix -lmetis > > > > # This line is required for using some 'helper' function like > > cudaErrorCheck from samples suite > > CXXFLAGS += > > -Wl,-rpath,/sw/spack/deltas11-2023-03/apps/linux-rhel8-zen/gcc-8.5.0/metis-5.1.0-v5iddu2/lib > > # This two lines are required for using PETSc > > include ${PETSC_DIR}/lib/petsc/conf/variables > > include ${PETSC_DIR}/lib/petsc/conf/rules > > ############## > > > > However, adding "CXXFLAGS += -Wl,-rpath, path_to_lib" in the makefile under > > the same directory, is not working. And CPPFLAGS and CXXPPFLAGS won't work > > either. No errors while compiling, but cannot find the metis.o while > > running the binary. Another confusing point is, in the compilation flash > > screen, LDFLAGS options can be found, but CXXFLAGS cannot. > > > > Could you please inform me how to add additional flags in the makefile? > > > > Thanks, > > Qiyue Lu > > > >