CMakeLists.txt

# CMakeLists files in this project can
# refer to the root source directory of the project as ${PDC_SOURCE_DIR} and
# to the root binary directory of the project as ${PDC_BINARY_DIR}.
cmake_minimum_required (VERSION 3.5)

# Setup cmake policies.
foreach(p
    CMP0012 # CMake 2.6; Full Path Libraries; When set to NEW, the full path is included when specifying a link library in the target_link_libraries command.
    CMP0013 # CMake 2.6; Quoted Argument Expansion; When set to NEW, variables within quoted arguments are expanded, allowing variable substitution.
    CMP0014 # CMake 2.8; Relative Path Libraries; When set to NEW, relative paths in link libraries are interpreted as relative to the current source directory.
    CMP0022 # CMake 2.8.12; Same SONAME Overwrite; When set to NEW, shared libraries with the same SONAME are not overwritten during installation.
    CMP0025 # CMake 3.0; Empty if Statement; When set to NEW, an empty if condition is treated as false, providing better control over conditionals.
    CMP0053 # CMake 3.1; Find Package Version; When set to NEW, the VERSION option in find_package is interpreted as a version requirement rather than a version hint.
    CMP0054 # CMake 3.1; Quoted Empty String; When set to NEW, a quoted empty string is treated as false in the if() command.
    CMP0074 # CMake 3.12; Imported Target Usage Requirements; When set to NEW, the "PRIVATE" and "PUBLIC" keywords in target_link_libraries are treated as usage requirements for imported targets.
    CMP0075 # CMake 3.12; GNU-Style Installation Paths on macOS; When set to NEW, the "GNUInstallDirs" module is enabled by default on macOS for "GNU-style" installation paths.
    CMP0079 # Address sanitizer
    CMP0083 # CMake 3.14; Imported Targets Visibility; When set to NEW, imported targets created by find_package with namespaced aliases are visible to other targets within the same directory scope.
    CMP0093 # CMake 3.15; Compiler and Linker Flags Handling; When set to NEW, each option in a list of compiler and linker flags is interpreted separately, allowing better control over individual options.
  )
  if(POLICY ${p})
    cmake_policy(SET ${p} NEW)
  endif()
endforeach()

# Set a consistent MACOSX_RPATH default across all CMake versions.
# checks if the variable CMAKE_MACOSX_RPATH is not defined and sets it to 0 if it is not defined.
# The CMAKE_MACOSX_RPATH variable is used to control the behavior of the macOS-specific RPATH feature in CMake. 
# RPATH is a linker option that specifies the runtime library search path for executables and shared libraries.
# By default, when CMAKE_MACOSX_RPATH is not defined, the code sets it to 0, indicating that the project does not use the macOS RPATH feature. 
# This means that the runtime library search path will not be embedded in the executables or shared libraries produced by the project.
# This code snippet ensures a consistent default value for CMAKE_MACOSX_RPATH across different configurations of the project, even if the variable is not explicitly set before.
# When CMake 2.8.12 is required, change this default to 1.
# When CMake 3.0.0 is required, remove this block (see CMP0042).
if(NOT DEFINED CMAKE_MACOSX_RPATH)
  set(CMAKE_MACOSX_RPATH 0)
endif()

# Force g++ for linking, because RocksDB is C++
set(CMAKE_LINKER g++)
set(CMAKE_C_COMPILER gcc)
set(CMAKE_CXX_COMPILER g++)


# Project Name : Range Query, Programming Language : C
project(RangeQuery C)

# include CheckSymbolExists module
include(CheckSymbolExists)

# CMake will search for any header files under the project root directory.
include_directories(${PROJECT_SOURCE_DIR})

#------------------------------------------------------------------------------
# Find and configure MPI
#------------------------------------------------------------------------------
find_package(MPI REQUIRED)

if(MPI_FOUND)
  message(STATUS "MPI found: ${MPI_C_COMPILER}")
  message(STATUS "MPI include path: ${MPI_C_INCLUDE_PATH}")
  message(STATUS "MPI libraries: ${MPI_C_LIBRARIES}")
else()
  message(FATAL_ERROR "MPI not found. Please install MPI.")
endif()

# Add MPI include directories
include_directories(${MPI_C_INCLUDE_PATH})

# Set MPI-specific compile and link flags
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${MPI_C_COMPILE_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${MPI_C_LINK_FLAGS}")
#------------------------------------------------------------------------------
# Configure MPI
#------------------------------------------------------------------------------
# Set RocksDB root directory
set(ROCKSDB_ROOT "$ENV{HOME}/rocksdb")
include_directories(${ROCKSDB_ROOT}/include)
link_directories(${ROCKSDB_ROOT}/build)
include_directories($ENV{HOME}/snappy-install/include)
link_directories($ENV{HOME}/snappy-install/lib64)

#------------------------------------------------------------------------------
# Setup CMake Prefix Paths for searching external libraries.
#------------------------------------------------------------------------------
if(NOT CMAKE_PREFIX_PATH)
  set(CMAKE_PREFIX_PATH ${CMAKE_INSTALL_PREFIX})
endif()

set(CMAKE_C_FLAGS_DEBUG "-O0 -g")

ADD_SUBDIRECTORY(src)
ADD_SUBDIRECTORY(test)

# Link MPI libraries to the test target
# target_link_libraries(test PRIVATE ${MPI_C_LIBRARIES})
target_compile_definitions(test PRIVATE PROJECT_ROOT_DIR="${CMAKE_SOURCE_DIR}")