+2019-12-11 Bruno Haible <bruno@clisp.org>
+
+ stddef: Fix compilation error in C++ mode on MSVC.
+ * lib/stddef.in.h (max_align_t): With MSVC in C++ mode, don't define it;
+ instead, include <cstddef>.
+
2019-12-11 Bruno Haible <bruno@clisp.org>
unistd: Fix compilation error in C++ mode on MSVC.
/* Some platforms lack max_align_t. The check for _GCC_MAX_ALIGN_T is
a hack in case the configure-time test was done with g++ even though
- we are currently compiling with gcc. */
-#if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T)
-# if !GNULIB_defined_max_align_t
+ we are currently compiling with gcc.
+ On MSVC, max_align_t is defined only in C++ mode, after <cstddef> was
+ included. Its definition is good since it has an alignment of 8 (on x86
+ and x86_64). */
+#if defined _MSC_VER && defined __cplusplus
+# include <cstddef>
+#else
+# if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T)
+# if !GNULIB_defined_max_align_t
/* On the x86, the maximum storage alignment of double, long, etc. is 4,
but GCC's C11 ABI for x86 says that max_align_t has an alignment of 8,
and the C11 standard allows this. Work around this problem by
using __alignof__ (which returns 8 for double) rather than _Alignof
(which returns 4), and align each union member accordingly. */
-# ifdef __GNUC__
-# define _GL_STDDEF_ALIGNAS(type) \
- __attribute__ ((__aligned__ (__alignof__ (type))))
-# else
-# define _GL_STDDEF_ALIGNAS(type) /* */
-# endif
+# ifdef __GNUC__
+# define _GL_STDDEF_ALIGNAS(type) \
+ __attribute__ ((__aligned__ (__alignof__ (type))))
+# else
+# define _GL_STDDEF_ALIGNAS(type) /* */
+# endif
typedef union
{
char *__p _GL_STDDEF_ALIGNAS (char *);
long double __ld _GL_STDDEF_ALIGNAS (long double);
long int __i _GL_STDDEF_ALIGNAS (long int);
} rpl_max_align_t;
-# define max_align_t rpl_max_align_t
-# define GNULIB_defined_max_align_t 1
+# define max_align_t rpl_max_align_t
+# define GNULIB_defined_max_align_t 1
+# endif
# endif
#endif