MNT: Set default C++ standard to C++11. Do not set glibc ABI compatibility -

allow this to be set in the environment

config/common/buildSettings.mk

@@ -34,10 +34,10 @@ TCLSH   ?= ${FSLDIR}/bin/fsltclsh
 # constructed in common/vars.mk
 
 # Compiler flags for C projects
-ARCHCFLAGS =
+ARCHCFLAGS = -std=c99
 
 # Compiler flags for C++ projects.
-ARCHCXXFLAGS = -D_GLIBCXX_USE_CXX11_ABI=0
+ARCHCXXFLAGS = -std=c++11
 
 # Linker flags for all projects
 ARCHLDFLAGS =
@@ -61,10 +61,11 @@ ifeq ($(SYSTYPE), Darwin)
   # Commands
   CC  ?= cc
   CXX ?= c++
+  LD  ?= ld
 
   # Compiler flags
   ARCHCXXFLAGS += -arch x86_64 -Wall -pedantic -fPIC
-  ARCHCFLAGS   += $(ARCHCXXFLAGS) -std=c99
+  ARCHCFLAGS   += -arch x86_64 -Wall -pedantic -fPIC
   ARCHLDFLAGS  += -Wl,-search_paths_first
   ARCHLIBS     += -llapack -lblas -lz -lm
 endif
@@ -76,14 +77,16 @@ endif
 #####################################################################
 ifeq ($(SYSTYPE), Linux)
 
- # Commands
+  # Commands
   CC  ?= gcc
   CXX ?= c++
+  LD  ?= ld
 
   # Compiler flags
   ARCHCFLAGS   += -fexpensive-optimizations \
                   -Wall -pedantic -Wno-long-long -fPIC
-  ARCHCXXFLAGS += $(ARCHCFLAGS)
+  ARCHCXXFLAGS += -fexpensive-optimizations \
+                  -Wall -pedantic -Wno-long-long -fPIC
   ARCHLDFLAGS  += -Wl,-rpath,'$$ORIGIN/../lib'
   ARCHLIBS     += -lopenblas -lz -lm
 endif # if Linux

config/common/vars.mk

 #########################################################
 # Variables used for FSL project compilation/installation
+#
+# Default compiler/platform specific variables are
+# initialised in buildSettings.mk, which is included
+# before this file. Project specific variables are
+# initialised in the project Makefile.
 #########################################################
 
 # All projects must specify a name