From 33cf6f3bdca392af7dedab862d7b2b35669b965d Mon Sep 17 00:00:00 2001
From: Dhruba Borthakur <dhruba@fb.com>
Date: Tue, 13 Nov 2012 16:16:21 -0800
Subject: [PATCH] Make sse compilation optional.

Summary:
The fbcode compilation was always switching on msse by default.
This patch keeps the same behaviour but allows the compilation
process to switch off msse if needed.

If one does not want to use sse, then do the following:
export USE_SSE=0
make clean all

Test Plan: make clean all

Reviewers: heyongqiang

Reviewed By: heyongqiang

CC: leveldb

Differential Revision: https://reviews.facebook.net/D6717
---
 build_detect_platform | 2 +-
 fbcode.gcc471.sh      | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/build_detect_platform b/build_detect_platform
index 27cc75eb4..ede941506 100755
--- a/build_detect_platform
+++ b/build_detect_platform
@@ -128,7 +128,7 @@ if test "$USE_SCRIBE"; then
   DIRS="$DIRS scribe "
 fi
 
-set -f # temporarily disable globbing so that our patterns aren't expanded
+set -f # temporarily disable globbing so that our patterns arent expanded
 PRUNE_TEST="-name *test*.cc -prune"
 PRUNE_BENCH="-name *_bench.cc -prune"
 PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o -name '*.cc' -print | sort | tr "\n" " "`
diff --git a/fbcode.gcc471.sh b/fbcode.gcc471.sh
index b518fed00..77d9f7add 100644
--- a/fbcode.gcc471.sh
+++ b/fbcode.gcc471.sh
@@ -33,7 +33,9 @@ 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 "
+if test -z "$USE_SSE"; then
+  export USE_SSE=" -msse -msse4.2 "
+fi
 
 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"