Add support for statically linking stdc++ to libfdbc_c on Centos while using custom hack for Ubuntu

Set compilationn flag to c++17

Makefile

@@ -1,14 +1,13 @@
 export
 PLATFORM := $(shell uname)
 ARCH := $(shell uname -m)
-ifeq ("$(wildcard /etc/centos-release)", "")
-	LIBSTDCPP_HACK = 1
-else
-	LIBSTDCPP_HACK = 0
-endif
-
 TOPDIR := $(shell pwd)
 
+# Allow custom libc++ hack for Ubuntu
+ifeq ("$(wildcard /etc/centos-release)", "")
+  LIBSTDCPP_HACK ?= 1
+endif
+
 ifeq ($(ARCH),x86_64)
   ARCH := x64
 else
@@ -43,7 +42,7 @@ ifeq ($(PLATFORM),Linux)
   CC ?= gcc
   CXX ?= g++
 
-  CXXFLAGS += -std=c++0x
+  CXXFLAGS += -std=c++17
 
   BOOST_BASEDIR ?= /opt
   TLS_LIBDIR ?= /usr/local/lib

bindings/c/local.mk

@@ -31,8 +31,14 @@ CLEAN_TARGETS += fdb_c_tests_clean
 
 ifeq ($(PLATFORM),linux)
   fdb_c_LDFLAGS += -Wl,--version-script=bindings/c/fdb_c.map -static-libgcc -Wl,-z,nodelete -lm -lpthread -lrt -ldl
-  ifeq ($(LIBSTDCPP_HACK),1)
-    fdb_c_LIBS += lib/libstdc++.a
+	# Link our custom libstdc++ statically in Ubuntu, if hacking
+  ifeq ("$(wildcard /etc/centos-release)", "")
+    ifeq ($(LIBSTDCPP_HACK),1)
+      fdb_c_LIBS += lib/libstdc++.a
+    endif
+	# Link stdc++ statically in Centos, if not hacking
+  else
+    fdb_c_STATIC_LIBS += -static-libstdc++
   endif
   fdb_c_tests_LIBS += -lpthread
 endif

bindings/flow/tester/local.mk

@@ -35,7 +35,7 @@ _fdb_flow_tester_clean:
 	@rm -rf bindings/flow/bin
 
 ifeq ($(PLATFORM),linux)
-  fdb_flow_tester_LDFLAGS += -static-libstdc++ -static-libgcc -ldl -lpthread -lrt
+  fdb_flow_tester_LDFLAGS += -static-libstdc++ -static-libgcc -ldl -lpthread -lrt -lm
 else ifeq ($(PLATFORM),osx)
   fdb_flow_tester_LDFLAGS += -lc++
 endif