cmake_modules/FindLZ4.cmake

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# LZ4_HOME environment variable is used to check for LZ4 headers and static library

# LZ4_INCLUDE_DIR: directory containing headers
# LZ4_LIBS: directory containing LZ4 libraries
# LZ4_STATIC_LIB: path to lz4.a
# LZ4_FOUND: whether LZ4 has been found

if( NOT "${LZ4_HOME}" STREQUAL "")
    file (TO_CMAKE_PATH "${LZ4_HOME}" _lz4_path)
endif()

message (STATUS "LZ4_HOME: ${LZ4_HOME}")

find_path (LZ4_INCLUDE_DIR lz4.h HINTS
  ${_lz4_path}
  NO_DEFAULT_PATH
  PATH_SUFFIXES "include")

find_library (LZ4_LIBRARIES NAMES lz4 HINTS
  ${_lz4_path}
  PATH_SUFFIXES "lib")

if (LZ4_INCLUDE_DIR AND LZ4_LIBRARIES)
  set (LZ4_FOUND TRUE)
  get_filename_component (LZ4_LIBS ${LZ4_LIBRARIES} PATH)
  set (LZ4_HEADER_NAME lz4.h)
  set (LZ4_HEADER ${LZ4_INCLUDE_DIR}/${LZ4_HEADER_NAME})
  set (LZ4_LIB_NAME lz4)
  set (LZ4_STATIC_LIB ${LZ4_LIBS}/${CMAKE_STATIC_LIBRARY_PREFIX}${LZ4_LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
else ()
  set (LZ4_FOUND FALSE)
endif ()

if (LZ4_FOUND)
  message (STATUS "Found the LZ4 header: ${LZ4_HEADER}")
  message (STATUS "Found the LZ4 library: ${LZ4_STATIC_LIB}")
else()
  if (_lz4_path)
    set (LZ4_ERR_MSG "Could not find LZ4. Looked in ${_lz4_path}.")
  else ()
    set (LZ4_ERR_MSG "Could not find LZ4 in system search paths.")
  endif ()

  if (LZ4_FIND_REQUIRED)
    message (FATAL_ERROR "${LZ4_ERR_MSG}")
  else ()
    message (STATUS "${LZ4_ERR_MSG}")
  endif ()
endif()

mark_as_advanced (
  LZ4_INCLUDE_DIR
  LZ4_STATIC_LIB
  LZ4_LIBS
  LZ4_LIBRARIES
)