From 01bc6016fb86e6aa5b714752b7e18d6a3c96eca4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrik=20Novotn=C3=BD?= <panovotn@redhat.com>
Date: Fri, 17 Aug 2018 10:38:13 +0200
Subject: [PATCH] use system Bzip2 library if available

---
 CMakeLists.txt | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 11f35dd..c6606b6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,6 +45,16 @@ if(USE_ZLIB)
     add_definitions(-DHAVE_ZLIB)
 endif()
 
+# Check if bzip2 installation is present
+if(USE_BZIP2)
+    set(BZIP2_ROOT ${DEF_BZIP2_ROOT} CACHE PATH "Parent directory of bzip2 installation")
+    find_package(BZip2)
+    if(BZIP2_FOUND)
+        include_directories(${BZIP2_INCLUDE_DIRS})
+    endif()
+    add_definitions(-DHAVE_BZIP2)
+endif()
+
 set(MINIZIP_PC ${CMAKE_CURRENT_BINARY_DIR}/minizip.pc)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/minizip.pc.cmakein ${MINIZIP_PC} @ONLY)
 
@@ -202,7 +212,14 @@ if(USE_ZLIB)
     endif()
 endif()
 
-if(USE_BZIP2)
+if(USE_BZIP2 AND BZIP2_FOUND)
+    add_definitions(-DHAVE_BZIP2)
+
+    list(APPEND MINIZIP_SRC "mz_strm_bzip.c")
+    list(APPEND MINIZIP_PUBLIC_HEADERS "mz_strm_bzip.h")
+
+    set(CMAKE_REQUIRED_LIBRARIES BZip2::BZip2)
+elseif(USE_BZIP2)
     add_definitions(-DHAVE_BZIP2)
     add_definitions(-DBZ_NO_STDIO)
 
@@ -370,6 +387,9 @@ set_target_properties(${PROJECT_NAME} PROPERTIES LINKER_LANGUAGE C PREFIX ""
 if(USE_ZLIB)
     target_link_libraries(${PROJECT_NAME} ZLIB::ZLIB)
 endif()
+if(USE_BZIP2 AND BZIP2_FOUND)
+    target_link_libraries(${PROJECT_NAME} BZip2::BZip2)
+endif()
 if(USE_LZMA)
     set_target_properties(${PROJECT_NAME} PROPERTIES C_STANDARD 99)
 endif()
-- 
2.17.1