Use C++11 alignof(type) if available

CMakeLists.txt

@@ -147,10 +147,11 @@ if(${Boost_VERSION} LESS 104800)
 	# Older Boost versions don't work with C++11
 elseif(USE_CXX11)
 	enable_cxx11()
-	check_cxx11("std::unique_ptr" INNOEXTRACT_HAVE_STD_UNIQUE_PTR)
+	check_cxx11("alignof" INNOEXTRACT_HAVE_ALIGNOF)
 	if(WIN32)
 		check_cxx11("std::codecvt_utf8_utf16" INNOEXTRACT_HAVE_STD_CODECVT_UTF8_UTF16)
 	endif()
+	check_cxx11("std::unique_ptr" INNOEXTRACT_HAVE_STD_UNIQUE_PTR)
 endif()
 
 # Don't expose internal symbols to the outside world by default

cmake/check-cxx11-alignof.cpp

@@ -0,0 +1,3 @@
+int main() {
+	return alignof(int) != 1;
+}

src/configure.hpp.in

@@ -26,6 +26,7 @@
 #cmakedefine01 INNOEXTRACT_HAVE_BSWAP_64
 
 // C++11 functionality
+#cmakedefine01 INNOEXTRACT_HAVE_ALIGNOF
 #cmakedefine01 INNOEXTRACT_HAVE_STD_CODECVT_UTF8_UTF16
 #cmakedefine01 INNOEXTRACT_HAVE_STD_UNIQUE_PTR
 

src/util/types.hpp

@@ -32,6 +32,8 @@
 
 #include "util/util.hpp"
 
+#include "configure.hpp"
+
 namespace util {
 
 #if BOOST_VERSION < 104200
@@ -91,7 +93,9 @@ struct compatible_integer<Base, Bits, true> {
 //! Get the alignment of a type.
 template <class T>
 unsigned int alignment_of() {
-#if defined(_MSC_VER) && _MSC_VER >= 1300
+#if INNOEXTRACT_HAVE_ALIGNOF
+	return alignof(T);
+#elif defined(_MSC_VER) && _MSC_VER >= 1300
 	return __alignof(T);
 #elif defined(__GNUC__)
 	return __alignof__(T);