# -*- mode: cmake; -*-
cmake_minimum_required(VERSION 3.16)
project(nix CXX)
set(CMAKE_CXX_STANDARD 17)

# Export compile_commands.json which can be used by tools such as
# clangd and clang-tidy.
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Provide an output path for pkgconfig.
include(GNUInstallDirs)
set(PKGCONFIG_INSTALL_DIR ${CMAKE_INSTALL_LIBDIR}/pkgconfig)

# The following lines import CMake-native dependencies which may
# contain useful definitions. Other dependencies are not treated
# specially by CMake and are only linked into the resulting binary.
find_package(BZip2)
find_package(Boost COMPONENTS context) # probably coroutine + ::headers, lets find out
find_package(CURL)
find_package(SQLite3)
find_package(Threads)
find_package(LibLZMA)

# Abseil really doesn't like being precompiled. It is included here as
# an imported CMake project (i.e. it will be built /with/ this
# project).
#
# In development mode, the 'abseil_cpp' folder is symlinked to
# ../abseil_cpp (the relative location in the depot). In derivation
# builds this symlink is automatically replaced with an appropriate
# link to the Abseil sources in the Nix store.
add_subdirectory(abseil_cpp)
install(DIRECTORY abseil_cpp/absl
  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
  FILES_MATCHING
    PATTERN "*.inc"
    PATTERN "*.h"
    PATTERN "copts" EXCLUDE
    PATTERN "testdata" EXCLUDE
  )

# Linking precompiled glog binaries (linked against libstdc++) leads
# to working binaries that do not output log messages. It seems that
# in order to use glog with LLVM & libc++, one needs to make glog a
# part of the local project build.
add_subdirectory(glog)

# generate a configuration file (autoheader-style) to configure
# certain symbols that Nix depends on.
configure_file(config.h.in nix_config.h @ONLY)
INSTALL(FILES "${PROJECT_BINARY_DIR}/nix_config.h" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/nix")

# install corepkgs
configure_file(corepkgs/config.nix.in config.nix @ONLY)
INSTALL(DIRECTORY corepkgs
  DESTINATION ${CMAKE_INSTALL_DATADIR}/nix
  FILES_MATCHING
    PATTERN "*.nix")
INSTALL(FILES "${PROJECT_BINARY_DIR}/config.nix" DESTINATION "${CMAKE_INSTALL_DATADIR}/nix/corepkgs")

add_subdirectory(src)