[petsc-users] Compile and link correctly using conf/petscvariables and conf/variables

[Matthew Knepley]

On Thu, Aug 5, 2010 at 10:39 AM, Filippo Spiga <
filippo.spiga at disco.unimib.it> wrote:

>  Dear users,
>    I look at different examples but I'm not sure to have well understood
> how to compile and link correctly using the contents of
> "conf/petscvariables" and "conf/variables". My program uses both linear and
> non linear solvers and different external packages such as superlu_dist,
> hypre and umfpack. I looked at
> "${PETSC_ROOT}/${PETSC_ARCH}/conf/petscvariables" to extract the right path
> to compile and link my code. Inside this file there are all these lines:
>
> PETSC_CONTRIB_BASIC = -lpetsc
> PETSC_SNES_LIB_BASIC = -lpetsc
> PETSC_KSP_LIB_BASIC = -lpetsc
> PETSC_MAT_LIB_BASIC = -lpetsc
> PETSC_LIB_BASIC = -lpetsc
> PETSC_VEC_LIB_BASIC = -lpetsc
> PETSC_DM_LIB_BASIC = -lpetsc
> PETSC_TS_LIB_BASIC = -lpetsc
> PETSC_SYS_LIB_BASIC = -lpetsc
> PACKAGES_LIBS = ...
>
> but there isn't a single entry that collect in the right order all of them.
> Then if I look at "${PETSC_ROOT}/${PETSC_ARCH}/conf/variables" I can find
> these lines:
>
> PETSC_EXTERNAL_LIB_BASIC = ${EXTERNAL_LIB} ${PACKAGES_LIBS}
> ${PCC_LINKER_LIBS}
> PETSC_SYS_LIB_BASIC      = -lpetscsys
> PETSC_VEC_LIB_BASIC      = -lpetscvec ${PETSC_SYS_LIB_BASIC}
> PETSC_MAT_LIB_BASIC      = -lpetscmat ${PETSC_VEC_LIB_BASIC}
> PETSC_DM_LIB_BASIC       = -lpetscdm ${PETSC_MAT_LIB_BASIC}
> PETSC_KSP_LIB_BASIC     = -lpetscksp ${PETSC_DM_LIB_BASIC}
> PETSC_SNES_LIB_BASIC     = -lpetscsnes ${PETSC_KSP_LIB_BASIC}
> PETSC_TS_LIB_BASIC       = -lpetscts ${PETSC_SNES_LIB_BASIC}
> PETSC_LIB_BASIC          = ${PETSC_TS_LIB_BASIC}
> PETSC_CONTRIB_BASIC      = -lpetsccontrib
>
> PETSC_SYS_LIB     = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_SYS_LIB_BASIC}  ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_VEC_LIB     = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_VEC_LIB_BASIC}  ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_MAT_LIB     = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_MAT_LIB_BASIC}  ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_DM_LIB      = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_DM_LIB_BASIC}   ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_KSP_LIB     = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_KSP_LIB_BASIC}  ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_SNES_LIB    = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_SNES_LIB_BASIC} ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_TS_LIB      = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_TS_LIB_BASIC}   ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_LIB         = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR} ${PETSC_LIB_BASIC}
>      ${PETSC_EXTERNAL_LIB_BASIC}
> PETSC_CONTRIB     = ${C_SH_LIB_PATH} -L${PETSC_LIB_DIR}
> ${PETSC_CONTRIB_BASIC}
>
> that are pretty clear. However if I look inside
> "${PETSC_ROOT}/${PETSC_ARCH}/lib" I don't  see all the -lpetsc* libraries
> mentioned above" I only have one single "libpetsc.a"
>
> So, what's the right env variable to use? what is the right order of
> -lpetsc* statements? Can I only link "libpetsc.a"? In this last case, is my
> Makefile fully compatible and maintenable with all the future version of
> PETSc?
>

Is is always correct to use

include ${PETSC_DIR}/conf/variables
include ${PETSC_DIR}/conf/rules

foo: foo.o
     ${CLINKER} -o foo foo.o ${PETSC_TS_LIB}

We switched in the latest release to having a single library, libpetsc.

  Matt


> Thank you very much in advance,
> Regards
>
> --
>
> Filippo SPIGA
>
> «Nobody will drive us out of Cantor's paradise.»
>     -- David Hilbert
>
>


-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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