Use -std=c++11

-std=c++0x / -std=gnu++0x was the working name of what is nowadays known as C++11.

Use the standard name to avoid accidentally depending on GCC-specific
extensions and other quirks.

GNUmakefile.am

@@ -18,11 +18,9 @@ AM_LDFLAGS = $(AM_COPT) $(AM_COVLDFLAGS)
 AM_CPPFLAGS += -I$(top_srcdir)
 
 RESOURCES =
+AM_CXXFLAGS += -std=c++11
 if COMPILER_IS_MINGW32
  RESOURCES += res/libsass.rc
- AM_CXXFLAGS += -std=gnu++0x
-else
- AM_CXXFLAGS += -std=c++0x
 endif
 
 TEST_EXTENSIONS = .rb

Makefile

@@ -51,21 +51,19 @@ ifdef LIBSASS_VERSION
  CXXFLAGS += -DLIBSASS_VERSION="\"$(LIBSASS_VERSION)\""
 endif
 
-# enable mandatory flag
+CXXFLAGS += -std=c++11
+LDFLAGS += -std=c++11
+
 ifeq (Windows,$(UNAME))
  ifneq ($(BUILD),shared)
  STATIC_ALL ?= 1
  endif
  STATIC_LIBGCC ?= 1
  STATIC_LIBSTDCPP ?= 1
- CXXFLAGS += -std=gnu++0x
- LDFLAGS += -std=gnu++0x
 else
  STATIC_ALL ?= 0
  STATIC_LIBGCC ?= 0
  STATIC_LIBSTDCPP ?= 0
- CXXFLAGS += -std=c++0x
- LDFLAGS += -std=c++0x
 endif
 
 ifndef SASS_LIBSASS_PATH

src/GNUmakefile.am

@@ -13,11 +13,7 @@ AM_CFLAGS = $(AM_COPT)
 AM_CXXFLAGS = $(AM_COPT)
 AM_LDFLAGS = $(AM_COPT) $(AM_COVLDFLAGS)
 
-if COMPILER_IS_MINGW32
- AM_CXXFLAGS += -std=gnu++0x
-else
- AM_CXXFLAGS += -std=c++0x
-endif
+AM_CXXFLAGS += -std=c++11
 
 EXTRA_DIST = \
  COPYING \