[petsc-users] How to add additional cpp flags in the makefile while compiling a code?

[Qiyue Lu]

Thanks, it works with appending to LDFLAGS.
May I know how to add additional CPP options? It seems manually adding to
CXXFLAGS, CPPFLAGS and CXXPPFLAGS won't work in the makefile.

Qiyue Lu

On Tue, Jul 9, 2024 at 6:34 PM Satish Balay <balay.anl at fastmail.org> wrote:

> And sometimes you might need to list these additional libraries/options
> after PETSc libraries - in the link command. One way:
>
> balay at pj01:~/test$ cat makefile
>
> include ${PETSC_DIR}/lib/petsc/conf/variables
> include ${PETSC_DIR}/lib/petsc/conf/rules
> LDLIBS += -foobar
>
> balay at pj01:~/test$ 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 at pj01:~/test$ ls
> > ex2.cpp  makefile
> > balay at pj01:~/test$ cat makefile
> >
> > include ${PETSC_DIR}/lib/petsc/conf/variables
> > include ${PETSC_DIR}/lib/petsc/conf/rules
> >
> > balay at pj01:~/test$ 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 at pj01:~/test$ make clean
> > balay at 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 at 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 at 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
> > >
> >
> >
>
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