Ability to switch to gcc 4.1.6 and also use jemalloc. Thanks for Chip for large amounts of help.

Summary:
Task ID: #

Blame Rev:

Test Plan: Revert Plan:

Reviewers: chip

Reviewed By: chip

CC: sc, adsharma

Differential Revision: https://reviews.facebook.net/D3225

Makefile

@@ -92,7 +92,7 @@ $(LIBRARY): $(LIBOBJECTS)
 	$(AR) -rs $@ $(LIBOBJECTS)
 
 db_bench: db/db_bench.o $(LIBOBJECTS) $(TESTUTIL)
-	$(CXX) db/db_bench.o $(LIBOBJECTS) $(TESTUTIL) -o $@  $(LDFLAGS)
+	$(CXX) db/db_bench.o $(LIBOBJECTS) $(TESTUTIL) $(EXEC_LDFLAGS) -o $@  $(LDFLAGS)
 
 db_bench_sqlite3: doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL)
 	$(CXX) doc/bench/db_bench_sqlite3.o $(LIBOBJECTS) $(TESTUTIL) -o $@ $(LDFLAGS) -lsqlite3

README.fb

@@ -0,0 +1,3 @@
+* How to compile using fbcode and jemalloc
+  source fbcode.sh
+  make 

fbcode.sh

@@ -0,0 +1,21 @@
+#
+# Set environment variables so that we can compile leveldb using
+# fbcode settings.  It uses the latest g++ compiler and also
+# uses jemalloc
+
+TOOLCHAIN_REV=d28c90311ca14f9f0b2bb720f4e34b285513d4f4
+TOOLCHAIN_EXECUTABLES="/mnt/gvfs/third-party/$TOOLCHAIN_REV/centos5.2-native"
+TOOLCHAIN_LIB_BASE="/mnt/gvfs/third-party/$TOOLCHAIN_REV/gcc-4.6.2-glibc-2.13"
+
+CC="$TOOLCHAIN_EXECUTABLES/gcc/gcc-4.6.2-glibc-2.13/bin/gcc" 
+CXX="$TOOLCHAIN_EXECUTABLES/gcc/gcc-4.6.2-glibc-2.13/bin/g++"
+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"
+CFLAGS+=" -I $TOOLCHAIN_LIB_BASE/jemalloc/jemalloc-2.2.5/96de4f9/include -DHAVE_JEMALLOC"
+
+EXEC_LDFLAGS=" -Wl,--whole-archive $TOOLCHAIN_LIB_BASE/jemalloc/jemalloc-2.2.4/96de4f9/lib/libjemalloc.a "
+EXEC_LDFLAGS+="-Wl,--no-whole-archive $TOOLCHAIN_LIB_BASE/libunwind/libunwind-20100810/4bc2c16/lib/libunwind.a"
+
+export CC CXX AR RANLIB CFLAGS EXEC_LDFLAGS