LibrePCB

set(MUPARSER_SUBMODULE_BASEPATH "${PROJECT_SOURCE_DIR}/libs/muparser")
if(EXISTS "${MUPARSER_SUBMODULE_BASEPATH}"
   AND NOT UNBUNDLE_MUPARSER
   AND NOT UNBUNDLE_ALL
)
  message(STATUS "Using vendored MuParser")

  # Disable unneeded features
  set(ENABLE_SAMPLES
      OFF
      CACHE BOOL "Build the samples" FORCE
  )
  set(ENABLE_OPENMP
      OFF
      CACHE BOOL "Enable OpenMP for multithreading" FORCE
  )
  set(ENABLE_WIDE_CHAR
      OFF
      CACHE BOOL "Enable wide character support" FORCE
  )

  # Include local submodule
  add_subdirectory(
    "${MUPARSER_SUBMODULE_BASEPATH}" "${CMAKE_BINARY_DIR}/libs/muparser"
    EXCLUDE_FROM_ALL
  )

  # Suppress compiler warnings since they are not under our control.
  target_compile_options(muparser PRIVATE -Wno-deprecated-declarations)
  if(CMAKE_CXX_COMPILER_ID MATCHES "Clang") # Options which are unknown by GCC
    target_compile_options(muparser PUBLIC -Wno-nested-anon-types)
  endif()

  # Alias lib to namespaced variant
  add_library(MuParser::MuParser ALIAS muparser)

  # Stop here, we're done
  return()
endif()

# Otherwise, try to find shared library on the system
find_package(muparser 2.0 QUIET)
if(muparser_FOUND)
  message(STATUS "Using system MuParser")

  # Add uppercase alias if only the lowercase target is defined
  if(NOT TARGET MuParser::MuParser)
    add_library(MuParser::MuParser ALIAS muparser::muparser)
  endif()

  # Stop here, we're done
  return()
endif()

# Otherwise, try to find shared library on the system via pkg-config
find_package(PkgConfig QUIET)
if(PKGCONFIG_FOUND)
  pkg_check_modules(MuParser GLOBAL IMPORTED_TARGET muparser)
endif()
if(MuParser_FOUND)
  message(STATUS "Using system MuParser (via pkg-config)")
  add_library(MuParser::MuParser ALIAS PkgConfig::MuParser)
  return()
endif()

message(FATAL_ERROR "Did not find MuParser system library")