Add trampoline check (backported).

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/branches/stable@24766 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,8 @@
+2007-03-05  Adam Fedor  <fedor@gnu.org>
+
+        * configure.ac, config/config.trampoline.c: Add trampoline test.
+	(backported).
+	
 2007-03-02  Richard Frith-Macdonald <rfm@gnu.org>
 
         * Source/GSHTTPURLHandle.m:

config/config.trampoline.c

@@ -0,0 +1,103 @@
+/* Trampoline test */
+
+/*
+ * Copyright 1995-1999, 2001-2002, 2004-2006 Bruno Haible, <bruno@clisp.org>
+ *
+ * This is free software distributed under the GNU General Public Licence
+ * described in the file COPYING. Contact the author if you don't have this
+ * or can't live with it. There is ABSOLUTELY NO WARRANTY, explicit or implied,
+ * on this software.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "trampoline_r.h"
+
+#define MAGIC1  0x9db9af42
+#define MAGIC2  0x614a13c9
+#define MAGIC3  0x7aff3cb4
+#define MAGIC4  0xa2f9d045
+
+#ifdef __cplusplus
+typedef int (*function)(...);
+#else
+typedef int (*function)();
+#endif
+
+#if defined(__i386__)
+int f (void* env, int x)
+#else
+int f (int x)
+#endif
+{
+#ifdef __GNUC__
+#ifdef __m68k__
+#ifdef __NetBSD__
+register void* env __asm__("a1");
+#else
+register void* env __asm__("a0");
+#endif
+#endif
+#ifdef __mips__
+register void* env __asm__("$2");
+#endif
+#ifdef __mips64__
+register void* env __asm__("$2");
+#endif
+#if defined(__sparc__) && !defined(__sparc64__)
+register void* env __asm__("%g2");
+#endif
+#ifdef __sparc64__
+register void* env __asm__("%g5");
+#endif
+#ifdef __alpha__
+register void* env __asm__("$1");
+#endif
+#ifdef __hppa__
+register void* env __asm__("%r29");
+#endif
+#ifdef __arm__
+register void* env __asm__("r12");
+#endif
+#ifdef __powerpc__
+#ifdef __NetBSD__
+register void* env __asm__("r13");
+#else
+register void* env __asm__("r11");
+#endif
+#endif
+#ifdef __m88k__
+register void* env __asm__("r11");
+#endif
+#ifdef __convex__
+register void* env __asm__("s0");
+#endif
+#ifdef __ia64__
+register void* env __asm__("r15");
+#endif
+#ifdef __x86_64__
+register void* env __asm__("r10");
+#endif
+#ifdef __s390__
+register void* env __asm__("r0");
+#endif
+
+  return x + (int)((long*)env)[0] + (int)((long*)env)[1] + MAGIC3;
+#else
+  return x + MAGIC3;
+#endif
+}
+
+int main ()
+{
+  function cf = alloc_trampoline_r((function)&f, (void*)MAGIC1, (void*)MAGIC2);
+#ifdef __GNUC__
+  if ((*cf)(MAGIC4) == MAGIC1+MAGIC2+MAGIC3+MAGIC4)
+#else
+  if ((*cf)(MAGIC4) == MAGIC3+MAGIC4)
+#endif
+    { free_trampoline_r(cf); printf("Works, test1 passed.\n"); exit(0); }
+  else
+    { printf("Doesn't work!\n"); exit(1); }
+}

configure.ac

@@ -1146,7 +1146,7 @@ case "$target_os" in
   cygwin*)	PASS_ARG=yes;;
 esac
 
-AC_MSG_CHECKING("use of pass-through arguments")
+AC_MSG_CHECKING(use of pass-through arguments)
 AC_ARG_ENABLE(pass-arguments,
   [  --enable-pass-arguments	Force user main call to NSProcessInfo initialize],,
   enable_pass_arguments=$PASS_ARG)
@@ -1159,7 +1159,7 @@ fi
 AC_SUBST(GS_PASS_ARGUMENTS)
 AC_MSG_RESULT($enable_pass_arguments)
 
-AC_MSG_CHECKING("use of fake-main definition")
+AC_MSG_CHECKING(use of fake-main definition)
 AC_ARG_ENABLE(fake-main,
   [  --enable-fake-main  		Force redefine of user main function],,
   enable_fake_main=no)
@@ -1268,7 +1268,7 @@ fi
 have_forward_hook=yes
 saved_CPPFLAGS="$CPPFLAGS"
 CPPFLAGS="$CPPFLAGS $OBJCFLAGS -x objective-c"
-AC_MSG_CHECKING("for forwarding callback in runtime")
+AC_MSG_CHECKING(for forwarding callback in runtime)
 AC_COMPILE_IFELSE([#include "$srcdir/config/config.forward.m"],
 	have_forward_hook=yes, have_forward_hook=no)
 AC_MSG_RESULT($have_forward_hook)
@@ -1278,7 +1278,7 @@ if test $have_forward_hook = no; then
 fi
 CPPFLAGS="$saved_CPPFLAGS"
 
-AC_MSG_CHECKING("FFI library usage")
+AC_MSG_CHECKING(FFI library usage)
 WITH_FFI=none
 if test $enable_libffi = yes; then
   AC_DEFINE(USE_LIBFFI,1,
@@ -1298,6 +1298,14 @@ elif test $enable_ffcall = yes; then
   if test $ffi_ok = yes; then
     AC_MSG_RESULT(ffcall)
   fi
+  AC_MSG_CHECKING(if ffcall trampolines work)
+  AC_RUN_IFELSE([#include "$srcdir/config/config.trampoline.c"],
+	  have_working_trampoline=yes, have_working_trampoline=no, 
+	  have_working_trampoline=yes)
+  AC_MSG_RESULT($have_working_trampoline)
+  if test $have_working_trampoline = no; then
+    ffi_ok=no
+  fi
 else
   ffi_ok=no
 fi
@@ -1307,6 +1315,10 @@ if test $ffi_ok = no; then
   echo
   if test $have_forward_hook = no; then
     echo "You do not have an up-to-date libobjc library installed"
+  elif test "$have_working_trampoline" = no; then
+    echo "You have ffcall, but it does not work properly. Most likely because"
+    echo "your're system's security policy is blocking some parts of ffcall"
+    echo "we recommend installing libffi instead."
   else
     echo "You do not have either ffcall or libffi installed, or configure needs"
     echo "--with-ffi-include and/or --with-ffi-library flags so GNUstep can find them"