Makefile: fix for GCC 7+ and clang 4+

Summary:
maysamyabandeh IslamAbdelRahman PTAL

Fix https://github.com/facebook/rocksdb/issues/2672

Signed-off-by: Cholerae Hu <huyingqian@pingcap.com>
Closes https://github.com/facebook/rocksdb/pull/2681

Differential Revision: D5561515

Pulled By: ajkr

fbshipit-source-id: 676187802ebd8a87a6c051bb565818a1bf89d0a9

Makefile

@@ -255,6 +255,19 @@ default: all
 WARNING_FLAGS = -W -Wextra -Wall -Wsign-compare -Wshadow \
   -Wno-unused-parameter
 
+CCVERSION = $(shell $(CXX) -dumpversion)
+CCNAME = $(shell $(CXX) --version | awk 'NR==1' | cut -f1 -d " ")
+
+ifeq ($(CCNAME), clang)
+ifeq ($(CCVERSION), 4*)
+	CXXFLAGS += -faligned-new
+endif
+else
+ifeq ($(CCVERSION), 7)
+	CXXFLAGS += -faligned-new
+endif
+endif
+
 ifndef DISABLE_WARNING_AS_ERROR
 	WARNING_FLAGS += -Werror
 endif