From 450c1d88b3e1af34614294830b4dc0612d198d26 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <chfast@gmail.com>
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Date: Wed, 8 May 2019 10:42:03 +0200
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Subject: [PATCH] cmake: Use find_package() to find Snappy
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Upstream: https://github.com/google/leveldb/pull/686/commits/3e73a396a082efc76e065ae974fe18c3bb27219d
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[Thomas: this commit allows to fix the detection of the snappy library
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in static link configurations]
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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---
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CMakeLists.txt | 12 ++++++++----
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cmake/FindSnappy.cmake | 31 +++++++++++++++++++++++++++++++
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2 files changed, 39 insertions(+), 4 deletions(-)
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create mode 100644 cmake/FindSnappy.cmake
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diff --git a/CMakeLists.txt b/CMakeLists.txt
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index 78fead6..2efccda 100644
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--- a/CMakeLists.txt
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+++ b/CMakeLists.txt
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@@ -6,6 +6,9 @@ cmake_minimum_required(VERSION 3.9)
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# Keep the version below in sync with the one in db.h
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project(leveldb VERSION 1.22.0 LANGUAGES C CXX)
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+# Include local CMake modules.
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+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
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+
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# This project can use C11, but will gracefully decay down to C89.
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set(CMAKE_C_STANDARD 11)
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set(CMAKE_C_STANDARD_REQUIRED OFF)
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@@ -31,13 +34,14 @@ option(LEVELDB_INSTALL "Install LevelDB's header and library" ON)
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include(TestBigEndian)
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test_big_endian(LEVELDB_IS_BIG_ENDIAN)
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+find_package(Snappy)
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+
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include(CheckIncludeFile)
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check_include_file("unistd.h" HAVE_UNISTD_H)
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include(CheckLibraryExists)
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check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_ATOMIC)
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check_library_exists(crc32c crc32c_value "" HAVE_CRC32C)
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-check_library_exists(snappy snappy_compress "" HAVE_SNAPPY)
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check_library_exists(tcmalloc malloc "" HAVE_TCMALLOC)
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include(CheckCXXSymbolExists)
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@@ -276,9 +280,9 @@ endif(HAVE_ATOMIC)
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if(HAVE_CRC32C)
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target_link_libraries(leveldb crc32c)
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endif(HAVE_CRC32C)
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-if(HAVE_SNAPPY)
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- target_link_libraries(leveldb snappy)
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-endif(HAVE_SNAPPY)
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+if(TARGET Snappy::snappy)
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+ target_link_libraries(leveldb Snappy::snappy)
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+endif()
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if(HAVE_TCMALLOC)
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target_link_libraries(leveldb tcmalloc)
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endif(HAVE_TCMALLOC)
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diff --git a/cmake/FindSnappy.cmake b/cmake/FindSnappy.cmake
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new file mode 100644
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index 0000000..88c1de9
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--- /dev/null
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+++ b/cmake/FindSnappy.cmake
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@@ -0,0 +1,31 @@
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+# Copyright 2019 The LevelDB Authors. All rights reserved.
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+# Use of this source code is governed by a BSD-style license that can be
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+# found in the LICENSE file. See the AUTHORS file for names of contributors.
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+
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+find_library(SNAPPY_LIBRARY
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+ NAMES snappy
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+ HINTS ${SNAPPY_ROOT_DIR}/lib
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+)
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+
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+find_path(SNAPPY_INCLUDE_DIR
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+ NAMES snappy.h
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+ HINTS ${SNAPPY_ROOT_DIR}/include
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+)
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+
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+include(FindPackageHandleStandardArgs)
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+find_package_handle_standard_args(Snappy DEFAULT_MSG SNAPPY_LIBRARY SNAPPY_INCLUDE_DIR)
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+
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+mark_as_advanced(SNAPPY_LIBRARY SNAPPY_INCLUDE_DIR)
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+
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+if(SNAPPY_FOUND)
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+ set(HAVE_SNAPPY TRUE) # For compatibity with generating port_config.h.
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+
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+ # Add imported targets.
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+ # Follow the package naming convetion 'Snappy::' from
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+ # https://github.com/google/snappy/blob/master/CMakeLists.txt#L211.
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+ add_library(Snappy::snappy UNKNOWN IMPORTED)
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+ set_target_properties(Snappy::snappy PROPERTIES
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+ IMPORTED_LOCATION ${SNAPPY_LIBRARY}
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+ INTERFACE_INCLUDE_DIRECTORIES ${SNAPPY_INCLUDE_DIR}
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+ )
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+endif()
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--
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2.26.2
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