[petsc-dev] Problem with petsc.pc when configured with --with-single-library=0

[Jed Brown]

"Garth N. Wells" <gnw20 at cam.ac.uk> writes:

> On 1 March 2017 at 16:22, Jed Brown <jed at jedbrown.org> wrote:
>> Barry and Garth, should we include RPATH flags in the Libs field of
>> PETSc.pc?  We normally include them in makefiles because PETSc is often
>> installed to places that aren't in the search path and environment
>> variables (LD_LIBRARY_PATH) are evil.
>>
>
> I don't think RPATH should be added - I think it's up to the caller to add it.

But how should the caller know which paths to RPATH?  Here is a new GNU
Make interface (the second line is only needed if you want RPATH).

LDFLAGS := $(shell pkg-config --libs-only-L --libs-only-other $(PETSc.pc))
LDFLAGS += $(patsubst -L%, $(shell pkg-config --variable=ldflag_rpath $(PETSc.pc))%, $(shell pkg-config --libs-only-L $(PETSc.pc)))

> A reason I moved to using the PETSc pkg-config file was to better
> support relocatable builds on our end (which is help for packaging
> systems like conda), so I would like it to stay easy.

Of course you could just filter out the RPATH flags coming from PETSc.

>> Are you aware of any conventions for handling RPATH in pkg-config?
>
> No - from a quick search there is discussion about the place but I
> couldn't see a clear convention.

I'm now providing a variable ldflag_rpath that is set to "-Wl,-rpath,"
or equivalent.

One concern I have is that I don't want users of PETSc to require a
third-party configuration system.  If you have simple code, you should
be able to write a simple makefile that portably builds PETSc.  We kinda
have that now, but our makefiles don't play well with others.

This is an example of what I'm producing now.  Any comments?


prefix=/home/jed/usr/petsc-mpich-basic-prefix
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=/home/jed/usr/petsc-mpich-basic-prefix/lib
ccompiler=/opt/mpich/bin/mpicc
cflags_extra="-fPIC  -Wall -Wwrite-strings -Wno-strict-aliasing -Wno-unknown-pragmas -fvisibility=hidden -g3"
cflags_dep="-MMD -MP"
ldflag_rpath="-Wl,-rpath,"
fcompiler=/opt/mpich/bin/mpif90
fflags_extra="-fPIC -Wall -ffree-line-length-0 -Wno-unused-dummy-argument -g"
blaslapacklibs=-llapack -lblas

Name: PETSc
Description: Library to solve ODEs and algebraic equations
Version: 3.7.5
Cflags:  -I/home/jed/petsc/include -I/home/jed/petsc/mpich-basic-prefix/include -I/opt/mpich/include
Libs: -L${libdir} -lpetsc
Libs.private: -L/opt/mpich/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1 -llapack -lblas -lX11 -lpthread -lhwloc -lssl -lcrypto -lm -lmpifort -lgfortran -lm -lgfortran -lm -lquadmath -lmpicxx -lstdc++ -lm -ldl -lmpi -lgcc_s -ldl
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