3rdparty/leveldb-1.4.patch

diff --git a/build_detect_platform b/build_detect_platform
index b71bf02..864e5fb 100755
--- a/build_detect_platform
+++ b/build_detect_platform
@@ -128,24 +128,8 @@ EOF
         COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
     fi
 
-    # Test whether Snappy library is installed
-    # http://code.google.com/p/snappy/
-    $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
-      #include <snappy.h>
-      int main() {}
-EOF
-    if [ "$?" = 0 ]; then
-        COMMON_FLAGS="$COMMON_FLAGS -DSNAPPY"
-        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lsnappy"
-    fi
+# Removed tests for TCMALLOC and SNAPPY to prevent additional dependencies.
 
-    # Test whether tcmalloc is available
-    $CXX $CFLAGS -x c++ - -o /dev/null -ltcmalloc 2>/dev/null  <<EOF
-      int main() {}
-EOF
-    if [ "$?" = 0 ]; then
-        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ltcmalloc"
-    fi
 fi
 
 PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
diff --git a/port/atomic_pointer.h b/port/atomic_pointer.h
index 35ae550..b4769b3 100644
--- a/port/atomic_pointer.h
+++ b/port/atomic_pointer.h
@@ -36,6 +36,8 @@
 #define ARCH_CPU_X86_FAMILY 1
 #elif defined(__ARMEL__)
 #define ARCH_CPU_ARM_FAMILY 1
+#elif defined(__ppc__) || defined(__powerpc__) || defined(__powerpc64__)
+#define ARCH_CPU_PPC_FAMILY 1
 #endif
 
 namespace leveldb {
@@ -83,6 +85,13 @@ inline void MemoryBarrier() {
 }
 #define LEVELDB_HAVE_MEMORY_BARRIER
 
+// PPC
+#elif defined(ARCH_CPU_PPC_FAMILY) && defined(__GNUC__)
+inline void MemoryBarrier() {
+  asm volatile("lwsync" : : : "memory");
+}
+#define LEVELDB_HAVE_MEMORY_BARRIER
+
 #endif
 
 // AtomicPointer built using platform-specific MemoryBarrier()