Detecting SLEPc via CMake

Hello, great package.

Is there a canonical way to detect slepc via CMake/pkg_config?

Is there a best practice, especially in conjunction with PETSc?

For CMake, there is no official module to find SLEPc libraries, but if you google slepc cmake module you will find a couple of them that may be useful. I am not an expert in CMake.

Regarding pkg-config, the following sample makefile should work.

default: ex1 ex1f

PETSc.pc := $(PETSC_DIR)/$(PETSC_ARCH)/lib/pkgconfig/PETSc.pc
SLEPc.pc := $(SLEPC_DIR)/$(PETSC_ARCH)/lib/pkgconfig/SLEPc.pc

CC := $(shell pkg-config --variable=ccompiler $(PETSc.pc))
CXX := $(shell pkg-config --variable=cxxcompiler $(PETSc.pc))
FC := $(shell pkg-config --variable=fcompiler $(PETSc.pc))
CFLAGS := $(shell pkg-config --variable=cflags_extra $(PETSc.pc)) $(shell pkg-config --cflags-only-other $(PETSc.pc))
FFLAGS := $(shell pkg-config --variable=fflags_extra $(SLEPc.pc))
CPPFLAGS := $(shell pkg-config --cflags-only-I $(SLEPc.pc))
LDFLAGS := $(shell pkg-config --libs-only-L --libs-only-other $(SLEPc.pc))
LDFLAGS += $(patsubst -L%, $(shell pkg-config --variable=ldflag_rpath $(PETSc.pc))%, $(shell pkg-config --libs-only-L $(SLEPc.pc)))
LDLIBS := $(shell pkg-config --libs-only-l $(SLEPc.pc))

print:
	@echo CC=$(CC)
	@echo CFLAGS=$(CFLAGS)
	@echo CPPFLAGS=$(CPPFLAGS)
	@echo LDFLAGS=$(LDFLAGS)
	@echo LDLIBS=$(LDLIBS)

Thanks for the quick answer.

Is there any plan to add CMake Support? I found a couple of CMake Modules for SLEPc, but considering the multitude of configuration options and the dependency on PETSc + the MPI problems, I thought you might have a silver bullet.

Cheers Jens

No. Currently I don't have time or resources for this. And my knowledge of CMake is very limited.

I would recommend using CMake's pkg-config support. You'll be referencing $(SLEPC_DIR)/$(PETSC_ARCH)/lib/pkgconfig/SLEPc.pc and $(PETSC_DIR)/$(PETSC_ARCH)/lib/pkgconfig/PETSc.pc.

Thanks @jedbrown. I have tried the following CMakeLists.txt file and it works for me. Hope it is useful.

cmake_minimum_required(VERSION 3.14)
project(ex1-with-cmake C)

find_package(PkgConfig REQUIRED) 
find_package(MPI REQUIRED)

include_directories(${MPI_INCLUDE_PATH})

pkg_check_modules(PETSC_PKG REQUIRED IMPORTED_TARGET PETSc)
pkg_check_modules(SLEPC_PKG REQUIRED IMPORTED_TARGET SLEPc)

add_executable(ex1 ex1.c)

if(MPI_COMPILE_FLAGS)
  set_target_properties(ex1 PROPERTIES
    COMPILE_FLAGS "${MPI_COMPILE_FLAGS}")
endif()

if(MPI_LINK_FLAGS)
  set_target_properties(ex1 PROPERTIES
    LINK_FLAGS "${MPI_LINK_FLAGS}")
endif()

target_link_libraries(ex1 PUBLIC
        ${MPI_LIBRARIES}
        PkgConfig::PETSC_PKG
        PkgConfig::SLEPC_PKG)

@jedbrown @joseroman thank you both. This is very helpful.

closed