Enable SSE when building with fbcode support.

Summary:
fbcode build now support SSE instructions.
Delete older version of the compile-helper fbcode.sh. This is
subsumed by fbcode.gcc471.sh.

Test Plan: run make check

Reviewers: heyongqiang, MarkCallaghan

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D6057

README.fb

@@ -4,7 +4,7 @@
 
 * Compiling for CPUs with SSE4 support
 
-  make OPT='-O2 -DNDEBUG -D__SSE4_2__'
+  make OPT='-O2 -DNDEBUG -msse -msse4.2'
 
   This makes CRC computation much faster, but
   binaries won't run on CPUs that don't support it.

build_detect_platform

@@ -220,6 +220,9 @@ if test "$USE_THRIFT" ||  test "$USE_SCRIBE" ; then
     PLATFORM_LDFLAGS+=$THRIFT_LDFLAGS
 fi
 
+# if Intel SSE instruction set is supported, set USE_SSE=" -msse -msse4.2 "
+COMMON_FLAGS+=$USE_SSE
+
 PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
 PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
 

fbcode.gcc471.sh

@@ -32,6 +32,9 @@ THRIFT_INCLUDE=" -I $TOOLCHAIN_LIB_BASE/boost/boost-1.48.0/bef9365/include -std=
 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"
 
+# use Intel SSE support for checksum calculations
+export USE_SSE=" -msse -msse4.2 "
+
 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