Re: Support pg_attribute_aligned and noreturn in MSVC

On Mon, Sep 19, 2022 at 06:21:58PM -0400, James Coleman wrote:
> It turns out that MSVC supports both noreturn [2] [3] and alignment
> [4] [5] attributes, so this patch adds support for those. MSVC also
> supports a form of packing, but the implementation as I can tell
> requires wrapping the entire struct (with a push/pop declaration set)
> [6], which doesn't seem to match the style of macros we're using for
> packing in other compilers, so I opted not to implement that
> attribute.

Interesting. Thanks for the investigation.

+/*
+ * MSVC supports aligned and noreturn
+ * Packing is also possible but only by wrapping the entire struct definition
+ * which doesn't fit into our current macro declarations.
+ */
+#elif defined(_MSC_VER)
+#define pg_attribute_aligned(a) __declspec(align(a))
+#define pg_attribute_noreturn() __declspec(noreturn)
#else
Nit: I think that the comment should be in the elif block for Visual.

pg_attribute_aligned() could be used in generic-msvc.h's
pg_atomic_uint64 as it uses now align.

Shouldn't HAVE_PG_ATTRIBUTE_NORETURN be set for the MSVC case as well?
--
Michael