CMake: Fix the build when XZ_TOOL_LZMADEC=OFF

Co-developed-by: 榆柳松 (ZhengSen Wang) <wzhengsen@gmail.com>
Fixes: fb50c6ba1d4c9405e5b12b5988b01a3002638c5d
Fixes: https://github.com/tukaani-project/xz/pull/134

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 40da486e67232c8b0360a0b25ae148c883b4415a..995cae6e08101cc7b93db698a017de95b4dc5d26 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1868,8 +1868,10 @@ if(HAVE_DECODERS)
                         COMPONENT "${XZDEC}_Runtime")
     endforeach()
 
-    # This is the only build-time difference with lzmadec.
-    target_compile_definitions(lzmadec PRIVATE "LZMADEC")
+    if(XZ_TOOL_LZMADEC)
+        # This is the only build-time difference with lzmadec.
+        target_compile_definitions(lzmadec PRIVATE "LZMADEC")
+    endif()
 
     if(UNIX)
         # NOTE: This puts the lzmadec.1 symlinks into xzdec_Documentation.