Add support for stdcall, thiscall, and fastcall on non-Windows x86-32

Linux supports the stdcall calling convention, either via functions
explicitly declared with the stdcall attribute, or via code compiled
with -mrtd which effectively makes stdcall the default.

This introduces FFI_STDCALL, FFI_THISCALL, and FFI_FASTCALL on
non-Windows x86-32 platforms, as non-default calling conventions.

11 files changed, 17 insertions, 11 deletions

diff --git a/testsuite/libffi.call/closure_stdcall.c b/testsuite/libffi.call/closure_stdcall.c
index 2cc2e03..871d576 100644
--- a/testsuite/libffi.call/closure_stdcall.c
+++ b/testsuite/libffi.call/closure_stdcall.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	<twalljava@dev.java.net> */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 #include "ffitest.h"
 
 static void
@@ -23,6 +23,9 @@ closure_test_stdcall(ffi_cif* cif __UNUSED__, void* resp, void** args,
 
 }
 
+#ifndef _MSC_VER
+#define __stdcall __attribute__((stdcall))
+#endif
 typedef int (__stdcall *closure_test_type0)(int, int, int, int);
 
 int main (void)
diff --git a/testsuite/libffi.call/closure_thiscall.c b/testsuite/libffi.call/closure_thiscall.c
index 33ce8b6..12a0a63 100644
--- a/testsuite/libffi.call/closure_thiscall.c
+++ b/testsuite/libffi.call/closure_thiscall.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	<ktietz@redhat.com> */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 #include "ffitest.h"
 
 static void
@@ -23,6 +23,9 @@ closure_test_thiscall(ffi_cif* cif __UNUSED__, void* resp, void** args,
 
 }
 
+#ifndef _MSC_VER
+#define __thiscall __attribute__((thiscall))
+#endif
 typedef int (__thiscall *closure_test_type0)(int, int, int, int);
 
 int main (void)
diff --git a/testsuite/libffi.call/fastthis1_win32.c b/testsuite/libffi.call/fastthis1_win32.c
index cbc4724..2bac3b2 100644
--- a/testsuite/libffi.call/fastthis1_win32.c
+++ b/testsuite/libffi.call/fastthis1_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 
 #include "ffitest.h"
 
diff --git a/testsuite/libffi.call/fastthis2_win32.c b/testsuite/libffi.call/fastthis2_win32.c
index 7bdd0e1..e78018c 100644
--- a/testsuite/libffi.call/fastthis2_win32.c
+++ b/testsuite/libffi.call/fastthis2_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 
 #include "ffitest.h"
 
diff --git a/testsuite/libffi.call/fastthis3_win32.c b/testsuite/libffi.call/fastthis3_win32.c
index b5d606d..c3af801 100644
--- a/testsuite/libffi.call/fastthis3_win32.c
+++ b/testsuite/libffi.call/fastthis3_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 
 #include "ffitest.h"
 
diff --git a/testsuite/libffi.call/many2_win32.c b/testsuite/libffi.call/many2_win32.c
index 4adbe4d..de6f9bb 100644
--- a/testsuite/libffi.call/many2_win32.c
+++ b/testsuite/libffi.call/many2_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 
 #include "ffitest.h"
 #include <float.h>
diff --git a/testsuite/libffi.call/many_win32.c b/testsuite/libffi.call/many_win32.c
index d9038f4..e696c93 100644
--- a/testsuite/libffi.call/many_win32.c
+++ b/testsuite/libffi.call/many_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 
 #include "ffitest.h"
 #include <float.h>
diff --git a/testsuite/libffi.call/strlen2_win32.c b/testsuite/libffi.call/strlen2_win32.c
index 0d81061..465b6c3 100644
--- a/testsuite/libffi.call/strlen2_win32.c
+++ b/testsuite/libffi.call/strlen2_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 
 #include "ffitest.h"
 
diff --git a/testsuite/libffi.call/strlen_win32.c b/testsuite/libffi.call/strlen_win32.c
index 6fbcc87..2a14b96 100644
--- a/testsuite/libffi.call/strlen_win32.c
+++ b/testsuite/libffi.call/strlen_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 
 #include "ffitest.h"
 
diff --git a/testsuite/libffi.call/struct1_win32.c b/testsuite/libffi.call/struct1_win32.c
index b756f5a..6decf02 100644
--- a/testsuite/libffi.call/struct1_win32.c
+++ b/testsuite/libffi.call/struct1_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 #include "ffitest.h"
 
 typedef struct
diff --git a/testsuite/libffi.call/struct2_win32.c b/testsuite/libffi.call/struct2_win32.c
index 5d02285..17a4519 100644
--- a/testsuite/libffi.call/struct2_win32.c
+++ b/testsuite/libffi.call/struct2_win32.c
@@ -4,7 +4,7 @@
    PR:		none.
    Originator:	From the original ffitest.c  */
 
-/* { dg-do run { target i?86-*-cygwin* i?86-*-mingw* } } */
+/* { dg-do run { target i?86-*-* } } */
 #include "ffitest.h"
 
 typedef struct