From a384e61261c518ab374e4965261bc6ce23f741b0 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jose.r.fonseca@gmail.com>
Date: Sat, 8 Oct 2011 12:42:56 +0100
Subject: [PATCH] Fix mixed in/out of source builds.

Mixing in/out of source builds is not really a good policy, but
something I do quite often due to convenience.
---
 thirdparty/snappy/CMakeLists.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/thirdparty/snappy/CMakeLists.txt b/thirdparty/snappy/CMakeLists.txt
index 2ee896c..bcacda7 100644
--- a/thirdparty/snappy/CMakeLists.txt
+++ b/thirdparty/snappy/CMakeLists.txt
@@ -44,3 +44,12 @@ add_library (snappy_bundled STATIC
 set_target_properties (snappy_bundled PROPERTIES
     COMPILE_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS}"
 )
+
+# If we're doing an out of source build remove any config.h from the source tree.
+if (NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
+    add_custom_command (
+        TARGET snappy_bundled
+        PRE_BUILD
+        COMMAND ${CMAKE_COMMAND} -E remove -f ${CMAKE_CURRENT_SOURCE_DIR}/config.h
+    )
+endif()
-- 
2.43.0