From 028c492c9d45ca29e2fbec79a203ba492016f15e Mon Sep 17 00:00:00 2001
From: Miklos Vajna <vmiklos@collabora.co.uk>
Date: Fri, 7 Sep 2018 23:12:36 +0200
Subject: [PATCH] Add an option to disable bzip2 support

The explicit switch is still on by default, but this way it's possible
to explicitly disable bzip2 support even if bzip2 is available on the
system.

This is useful if bzip2 is not needed, but would automatically lead to
an unwanted dependency.
---
 CMakeLists.txt | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 73a34855..879e0f21 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,7 @@ PROJECT(libzip C)
 OPTION(ENABLE_GNUTLS "Enable use of GnuTLS" ON)
 OPTION(ENABLE_OPENSSL "Enable use of OpenSSL" ON)
 OPTION(ENABLE_COMMONCRYPTO "Enable use of CommonCrypto" ON)
+OPTION(ENABLE_BZIP2 "Enable use of BZip2" ON)
 
 OPTION(BUILD_TOOLS "Build tools in the src directory (zipcmp, zipmerge, ziptool)" ON)
 OPTION(BUILD_REGRESS "Build regression tests" ON)
@@ -186,15 +187,17 @@ IF(ZLIB_VERSION_STRING VERSION_LESS "1.1.2")
   MESSAGE(FATAL_ERROR "-- ZLIB version too old, please install at least v1.1.2")
 ENDIF(ZLIB_VERSION_STRING VERSION_LESS "1.1.2")
 
-FIND_PACKAGE(BZip2)
-IF(BZIP2_FOUND)
-  SET (HAVE_LIBBZ2 1)
+IF(ENABLE_BZIP2)
+  FIND_PACKAGE(BZip2)
+  IF(BZIP2_FOUND)
+    SET (HAVE_LIBBZ2 1)
 
-  INCLUDE_DIRECTORIES(${BZIP2_INCLUDE_DIR})
-  SET (OPTIONAL_LIBRARY ${BZIP2_LIBRARY})
-ELSE()
-  MESSAGE(WARNING "-- bzip2 library not found; bzip2 support disabled")
-ENDIF(BZIP2_FOUND)
+    INCLUDE_DIRECTORIES(${BZIP2_INCLUDE_DIR})
+    SET (OPTIONAL_LIBRARY ${BZIP2_LIBRARY})
+  ELSE()
+    MESSAGE(WARNING "-- bzip2 library not found; bzip2 support disabled")
+  ENDIF(BZIP2_FOUND)
+ENDIF(ENABLE_BZIP2)
 
 IF (COMMONCRYPTO_FOUND)
   SET (HAVE_CRYPTO 1)