[5208] C++11 detection code moved to ax_cpp11.m4

1 files changed, 122 insertions, 0 deletions

diff --git a/m4macros/ax_cpp11.m4 b/m4macros/ax_cpp11.m4
new file mode 100644
index 0000000000..cf6b2ba6d6
--- /dev/null
+++ b/m4macros/ax_cpp11.m4
@@ -0,0 +1,122 @@
+AC_DEFUN([AX_ISC_CPP11], [
+
+CXX_SAVED=$CXX
+feature=
+for retry in "none" "--std=c++11" "--std=c++0x" "--std=c++1x" "fail"; do
+	if test "$retry" = "fail"; then
+		AC_MSG_ERROR([$feature (a C++11 feature) is not supported])
+	fi
+	if test "$retry" != "none"; then
+		AC_MSG_WARN([unsupported C++11 feature])
+		AC_MSG_NOTICE([retrying by adding $retry to $CXX])
+		CXX="$CXX_SAVED $retry"
+		AC_MSG_CHECKING($retry support)
+		AC_COMPILE_IFELSE(
+			[AC_LANG_PROGRAM(
+				[],
+				[int myincr = 1;])],
+			[AC_MSG_RESULT([yes])],
+			[AC_MSG_RESULT([no])
+			 continue])
+	fi
+
+	AC_MSG_CHECKING(std::unique_ptr support)
+	feature="std::unique_ptr"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[#include <memory>],
+			[std::unique_ptr<int> a;])],
+		[AC_MSG_RESULT([yes])],
+		[AC_MSG_RESULT([no])
+		 continue])
+
+	AC_MSG_CHECKING(cbegin/cend support)
+	feature="cbegin/cend"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[#include <string>],
+			[const std::string& s = "abcd";
+			 unsigned count = 0;
+			 for (std::string::const_iterator i = s.cbegin();
+			      i != s.cend(); ++i)
+				if (*i == 'b')
+					++count;])],
+		[AC_MSG_RESULT([yes])],
+		[AC_MSG_RESULT([no])
+		 continue])
+
+	AC_MSG_CHECKING(final method support)
+	feature="final method"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[class Foo {
+			 public:
+			 	virtual ~Foo() {};
+				virtual void bar() final;
+			 };],[])],
+		 [AC_MSG_RESULT([yes])],
+		 [AC_MSG_RESULT([no])
+		  continue])
+
+	AC_MSG_CHECKING(aggregate initialization support)
+	feature="aggregate initialization"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[#include <vector>],
+			[std::vector<int> foo = { 1, 2, 3};])],
+		[AC_MSG_RESULT([yes])],
+		[AC_MSG_RESULT([no])
+		 continue])
+
+	AC_MSG_CHECKING(variadic template support)
+	feature="variadic template"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[template<typename ... Args>
+			 struct A {
+			 void foo(Args... myargs) { return; };
+			 };],
+			 [A<> a;
+			  a.foo();])],
+		[AC_MSG_RESULT([yes])],
+		[AC_MSG_RESULT([no])
+		 continue])
+
+	AC_MSG_CHECKING(static_assert support)
+	feature="static_assert"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[static_assert(1 + 1 == 2, "");],
+			[])],
+		[AC_MSG_RESULT([yes])],
+		[AC_MSG_RESULT([no])
+		 continue])
+
+	AC_MSG_CHECKING(template alias)
+	feature="template alias"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[template<int i>
+			 class I {
+			 public: int get() { return i; };
+			 };
+			 using Zero = I<0>;],
+			[Zero Z;
+			 return Z.get();])],
+		[AC_MSG_RESULT([yes])],
+		[AC_MSG_RESULT([no])
+		 continue])
+
+	AC_MSG_CHECKING(lambda support)
+	feature="lambda"
+	AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+			[],
+			[auto myincr = [[]](int x) { return x + 1; };])],
+		[AC_MSG_RESULT([yes])
+		 break],
+		[AC_MSG_RESULT([no])
+		 continue])
+done
+
+])dnl AX_ISC_RPATH