Adding install capability (issue with Finding Kokkos)

CMakeLists.txt

@@ -7,9 +7,10 @@ list(INSERT CMAKE_MODULE_PATH 0 "${CMAKE_SOURCE_DIR}/cmake")
 # Options
 option(BUILD_EXAMPLES "Build kokkos-fft examples" ON)
 option(KokkosFFT_ENABLE_HOST_AND_DEVICE "Enable fft on both host and device" OFF)
+option(KokkosFFT_ENABLE_INSTALL_TEST "Enable install test" ON)
 
 find_package(Kokkos CONFIG)
-if(NOT kokkos_FOUND)
+if(NOT Kokkos_FOUND)
     add_subdirectory(tpls/kokkos)
 endif()
 
@@ -22,8 +23,44 @@ if(BUILD_TESTING)
     endif()
 endif()
 
+# Set directories used for install
+include(GNUInstallDirs)
+set(INSTALL_INCLUDEDIR ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR})
+set(INSTALL_LIBDIR ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
+
 add_subdirectory(common)
 add_subdirectory(fft)
 if(BUILD_EXAMPLES)
     add_subdirectory(examples)
-endif()
+endif()
+
+# Installation
+install(
+    TARGETS common fft
+    EXPORT KokkosFFT-targets
+)
+
+install(
+    EXPORT KokkosFFT-targets
+    DESTINATION ${INSTALL_INCLUDEDIR}
+)
+
+install(
+    DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/common/
+    DESTINATION ${INSTALL_INCLUDEDIR}
+)
+
+install(
+    DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/fft/
+    DESTINATION ${INSTALL_INCLUDEDIR}
+)
+
+configure_package_config_file(cmake/KokkosFFTConfig.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/KokkosFFTConfig.cmake
+    INSTALL_DESTINATION ${INSTALL_INCLUDEDIR}
+)
+
+install(
+    FILES ${CMAKE_CURRENT_BINARY_DIR}/KokkosFFTConfig.cmake
+    DESTINATION ${INSTALL_INCLUDEDIR}
+)

cmake/KokkosFFTConfig.cmake.in

@@ -0,0 +1,8 @@
+@PACKAGE_INIT@
+
+include(CMakeFindDependencyMacro)
+find_dependency(Kokkos)
+
+include(${CMAKE_CURRENT_LIST_DIR}/KokkosFFT-targets.cmake)
+
+check_required_components(KokkosFFT)

common/src/CMakeLists.txt

@@ -30,4 +30,7 @@ elseif(Kokkos_ENABLE_SERIAL)
 endif()
 
 target_compile_features(common INTERFACE cxx_std_17)
-target_include_directories(common INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(common INTERFACE
+                           $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+                           $<INSTALL_INTERFACE:${INSTALL_INCLUDEDIR}>
+)

fft/src/CMakeLists.txt

@@ -6,5 +6,8 @@ target_link_libraries(fft
     Kokkos::kokkos
 )
 
-target_include_directories(fft INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(fft INTERFACE
+                           $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+                           $<INSTALL_INTERFACE:${INSTALL_INCLUDEDIR}>
+)
 add_library(Kokkos::fft ALIAS fft)

install_test/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.21)
+project(install-test LANGUAGES CXX)
+
+find_package(KokkosFFT CONFIG REQUIRED)
+
+add_executable(install-test main.cpp)
+target_compile_features(install-test PUBLIC cxx_std_17)
+target_link_libraries(install-test PUBLIC Kokkos::fft)

install_test/main.cpp

@@ -0,0 +1,44 @@
+#include <Kokkos_Core.hpp>
+#include <Kokkos_Complex.hpp>
+#include <Kokkos_Random.hpp>
+#include <KokkosFFT.hpp>
+
+using execution_space = Kokkos::DefaultExecutionSpace;
+template <typename T>
+using View1D = Kokkos::View<T*, execution_space>;
+
+int main(int argc, char* argv[]) {
+  Kokkos::initialize(argc, argv);
+  {
+    constexpr int n0 = 128;
+    const Kokkos::complex<double> I(1.0, 1.0);
+
+    // 1D C2C FFT (Forward and Backward)
+    View1D<Kokkos::complex<double> > xc2c("xc2c", n0);
+    View1D<Kokkos::complex<double> > xc2c_hat("xc2c_hat", n0);
+    View1D<Kokkos::complex<double> > xc2c_inv("xc2c_inv", n0);
+
+    Kokkos::Random_XorShift64_Pool<> random_pool(12345);
+    Kokkos::fill_random(xc2c, random_pool, I);
+
+    KokkosFFT::fft(execution_space(), xc2c, xc2c_hat);
+    KokkosFFT::ifft(execution_space(), xc2c_hat, xc2c_inv);
+
+    // 1D R2C FFT
+    View1D<double> xr2c("xr2c", n0);
+    View1D<Kokkos::complex<double> > xr2c_hat("xr2c_hat", n0 / 2 + 1);
+    Kokkos::fill_random(xr2c, random_pool, 1);
+
+    KokkosFFT::rfft(execution_space(), xr2c, xr2c_hat);
+
+    // 1D C2R FFT
+    View1D<Kokkos::complex<double> > xc2r("xr2c_hat", n0 / 2 + 1);
+    View1D<double> xc2r_hat("xc2r", n0);
+    Kokkos::fill_random(xc2r, random_pool, I);
+
+    KokkosFFT::irfft(execution_space(), xc2r, xc2r_hat);
+  }
+  Kokkos::finalize();
+
+  return 0;
+}