Compile leveldb with gcc 4.7.1

Test Plan: run unit tests

Reviewers: heyongqiang

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D5163

fbcode.gcc471.sh

+#!/bin/sh
+#
+# Set environment variables so that we can compile leveldb using
+# fbcode settings.  It uses the latest g++ compiler and also
+# uses jemalloc
+# This is compiled with gcc version 4.7.1 for zeus proxy
+
+TOOLCHAIN_REV=90cb1654197e56261b1733c704b387285f36208e
+TOOLCHAIN_EXECUTABLES="/mnt/gvfs/third-party/$TOOLCHAIN_REV/centos5.2-native"
+TOOLCHAIN_LIB_BASE="/mnt/gvfs/third-party/$TOOLCHAIN_REV/gcc-4.7.1-glibc-2.14.1"
+
+# always build thrift server
+export USE_THRIFT=1
+
+# location of libhdfs libraries
+if test "$USE_HDFS"; then
+  JAVA_HOME="/usr/local/jdk-6u22-64"
+  JINCLUDE="-I$JAVA_HOME/include -I$JAVA_HOME/include/linux"
+  GLIBC_RUNTIME_PATH="/usr/local/fbcode/gcc-4.7.1-glibc-2.14.1"
+  HDFSLIB=" -Wl,--no-whole-archive hdfs/libhdfs.a -L$JAVA_HOME/jre/lib/amd64 "
+  HDFSLIB+=" -L$JAVA_HOME/jre/lib/amd64/server -L$GLIBC_RUNTIME_PATH/lib " 
+  HDFSLIB+=" -ldl -lverify -ljava -ljvm "
+fi
+
+# location of snappy headers and libraries
+SNAPPY_INCLUDE=" -I ./snappy"
+SNAPPY_LIBS=" -L./snappy/libs"
+
+# location of boost headers and libraries
+THRIFT_INCLUDE=" -I $TOOLCHAIN_LIB_BASE/boost/boost-1.48.0/bef9365/include -std=gnu++0x"
+THRIFT_INCLUDE+=" -I./thrift -I./thrift/gen-cpp -I./thrift/lib/cpp"
+THRIFT_LIBS=" -L $TOOLCHAIN_LIB_BASE/boost/boost-1.48.0/bef9365/lib"
+
+CC="$TOOLCHAIN_EXECUTABLES/gcc/gcc-4.7.1-glibc-2.14.1/bin/gcc" 
+CXX="$TOOLCHAIN_EXECUTABLES/gcc/gcc-4.7.1-glibc-2.14.1/bin/g++ $JINCLUDE $SNAPPY_INCLUDE $THRIFT_INCLUDE"
+AR=$TOOLCHAIN_EXECUTABLES/binutils/binutils-2.21.1/da39a3e/bin/ar
+RANLIB=$TOOLCHAIN_EXECUTABLES/binutils/binutils-2.21.1/da39a3e/bin/ranlib
+
+CFLAGS="-B$TOOLCHAIN_EXECUTABLES/binutils/binutils-2.21.1/bin/gold -m64 -mtune=generic -fPIC"
+CFLAGS+=" -I $TOOLCHAIN_LIB_BASE/jemalloc/jemalloc-2.2.5/57d2903/include -DHAVE_JEMALLOC"
+
+EXEC_LDFLAGS=" -Wl,--whole-archive $TOOLCHAIN_LIB_BASE/jemalloc/jemalloc-2.2.5/57d2903/lib/libjemalloc.a "
+EXEC_LDFLAGS+="-Wl,--no-whole-archive $TOOLCHAIN_LIB_BASE/libunwind/libunwind-20100812_experimental/91ddd43/lib/libunwind.a"
+EXEC_LDFLAGS+="$HDFSLIB $SNAPPY_LIBS $THRIFT_LIBS "
+EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $TOOLCHAIN_LIB_BASE/jemalloc/jemalloc-2.2.5/57d2903/lib/libjemalloc.so"
+
+export CC CXX AR RANLIB CFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED

port/port_posix.h

@@ -263,7 +263,7 @@ inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
   return output;
 #endif
 
-  return false;
+  return NULL;
 }
 
 inline bool BZip2_Compress(const char* input, size_t length,
@@ -320,7 +320,7 @@ inline bool BZip2_Compress(const char* input, size_t length,
   return true;
   return output;
 #endif
-  return false;
+  return NULL;
 }
 
 inline char*  BZip2_Uncompress(const char* input_data, size_t input_length,
@@ -377,7 +377,7 @@ inline char*  BZip2_Uncompress(const char* input_data, size_t input_length,
   BZ2_bzDecompressEnd(&_stream);
   return output;
 #endif
-  return false;
+  return NULL;
 }
 
 inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {