[RFC] Proposal for m*vc build issue (#138)

[Dominik Vogt <vogt@linux.vnet.ibm.com>]

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I've attached a patch implementing option 4 from here:
https://github.com/atgreen/libffi/issues/138 Please proof read the
patch and let me know what you think.  It might be good to
specifically double check the detection of a compiler with complex
support using macros.

Ciao

Dominik ^_^  ^_^

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Dominik Vogt
IBM Germany

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From e854b00c2fb86a5f65e08d299bea64883cefb99c Mon Sep 17 00:00:00 2001
From: Dominik Vogt <vogt@linux.vnet.ibm.com>
Date: Tue, 11 Nov 2014 13:55:22 +0100
Subject: [PATCH] Detect compiler's _Complex support by checking
 __STDC_NO_COMPLEX__.

---
 src/types.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/types.c b/src/types.c
index ef4f151..5c7bd27 100644
--- a/src/types.c
+++ b/src/types.c
@@ -44,6 +44,7 @@ maybe_const ffi_type ffi_type_##name = {	\
   id, NULL					\
 }
 
+#if !defined __STDC_NO_COMPLEX__ && defined __STDC_VERSION__ && (__STDC_VERSION__ >= 199901L)
 #define FFI_COMPLEX_TYPEDEF(name, type, maybe_const)	\
 static ffi_type *ffi_elements_complex_##name [2] = {	\
 	(ffi_type *)(&ffi_type_##name), NULL		\
@@ -58,6 +59,24 @@ maybe_const ffi_type ffi_type_complex_##name = {	\
   FFI_TYPE_COMPLEX,					\
   (ffi_type **)ffi_elements_complex_##name		\
 }
+#else
+/* Bogus definition for compilers without C99 complex support.  */
+#define FFI_COMPLEX_TYPEDEF(name, type, maybe_const)	\
+static ffi_type *ffi_elements_complex_##name [2] = {	\
+	(ffi_type *)(&ffi_type_##name), NULL		\
+};							\
+struct struct_align_complex_##name {			\
+  char c;						\
+  type x;						\
+  type y;						\
+};							\
+maybe_const ffi_type ffi_type_complex_##name = {	\
+  2 * sizeof(type),					\
+  offsetof(struct struct_align_complex_##name, x),	\
+  FFI_TYPE_COMPLEX,					\
+  (ffi_type **)ffi_elements_complex_##name		\
+}
+#endif
 
 /* Size and alignment are fake here. They must not be 0. */
 const ffi_type ffi_type_void = {
-- 
1.8.4.2