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cmake: Use find_package() to find Snappy #686

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cmake: Use find_package() to find Snappy #686

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978cda0
git ignore .idea
chfast May 8, 2019
3e73a39
cmake: Use find_package() to find Snappy
chfast May 8, 2019
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
*.sw*
.vscode
.DS_Store
.idea

# Build directory.
build/
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12 changes: 8 additions & 4 deletions CMakeLists.txt
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Expand Up @@ -6,6 +6,9 @@ cmake_minimum_required(VERSION 3.9)
# Keep the version below in sync with the one in db.h
project(leveldb VERSION 1.22.0 LANGUAGES C CXX)

# Include local CMake modules.
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

# This project can use C11, but will gracefully decay down to C89.
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED OFF)
Expand All @@ -31,12 +34,13 @@ option(LEVELDB_INSTALL "Install LevelDB's header and library" ON)
include(TestBigEndian)
test_big_endian(LEVELDB_IS_BIG_ENDIAN)

find_package(Snappy)

include(CheckIncludeFile)
check_include_file("unistd.h" HAVE_UNISTD_H)

include(CheckLibraryExists)
check_library_exists(crc32c crc32c_value "" HAVE_CRC32C)
check_library_exists(snappy snappy_compress "" HAVE_SNAPPY)
check_library_exists(tcmalloc malloc "" HAVE_TCMALLOC)

include(CheckCXXSymbolExists)
Expand Down Expand Up @@ -251,9 +255,9 @@ endif(HAVE_CLANG_THREAD_SAFETY)
if(HAVE_CRC32C)
target_link_libraries(leveldb crc32c)
endif(HAVE_CRC32C)
if(HAVE_SNAPPY)
target_link_libraries(leveldb snappy)
endif(HAVE_SNAPPY)
if(TARGET Snappy::snappy)
target_link_libraries(leveldb Snappy::snappy)
endif()
if(HAVE_TCMALLOC)
target_link_libraries(leveldb tcmalloc)
endif(HAVE_TCMALLOC)
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31 changes: 31 additions & 0 deletions cmake/FindSnappy.cmake
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@@ -0,0 +1,31 @@
# Copyright 2019 The LevelDB Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file. See the AUTHORS file for names of contributors.

find_library(SNAPPY_LIBRARY
NAMES snappy
HINTS ${SNAPPY_ROOT_DIR}/lib
)

find_path(SNAPPY_INCLUDE_DIR
NAMES snappy.h
HINTS ${SNAPPY_ROOT_DIR}/include
)

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Snappy DEFAULT_MSG SNAPPY_LIBRARY SNAPPY_INCLUDE_DIR)

mark_as_advanced(SNAPPY_LIBRARY SNAPPY_INCLUDE_DIR)

if(SNAPPY_FOUND)
set(HAVE_SNAPPY TRUE) # For compatibity with generating port_config.h.

# Add imported targets.
# Follow the package naming convetion 'Snappy::' from
# https://github.com/google/snappy/blob/master/CMakeLists.txt#L211.
add_library(Snappy::snappy UNKNOWN IMPORTED)
set_target_properties(Snappy::snappy PROPERTIES
IMPORTED_LOCATION ${SNAPPY_LIBRARY}
INTERFACE_INCLUDE_DIRECTORIES ${SNAPPY_INCLUDE_DIR}
)
endif()