configure: Require SEH support for PE builds.

configure

@@ -10819,6 +10819,55 @@ printf "%s\n" "$res" >&6; }
           as_fn_append ${wine_arch}_CC " $res" ;;
     esac
 
+    if test "x$wine_arch" = xi386
+then :
+
+else $as_nop
+  as_wine_cv_seh_support=`printf "%s\n" "ac_cv_${wine_arch}_seh_support" | $as_tr_sh`
+
+               { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC supports SEH directives" >&5
+printf %s "checking whether $CC supports SEH directives... " >&6; }
+if eval test \${$as_wine_cv_seh_support+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+asm(".text\nac_test:\t.seh_proc ac_test\n\tnop\n\t.seh_stackalloc 16\n\t.seh_endprologue\n\t.seh_endproc");
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  eval "$as_wine_cv_seh_support=yes"
+else $as_nop
+  eval "$as_wine_cv_seh_support=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+eval ac_res=\$$as_wine_cv_seh_support
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+               eval res=\$$as_wine_cv_seh_support
+
+               if test "x$res" = xyes
+then :
+
+else $as_nop
+  if test ${enable_archs+y}
+then :
+  as_fn_error $? "The $wine_arch cross-compiler doesn't support SEH directives.
+This is an error since --enable-archs=$wine_arch was requested." "$LINENO" 5
+fi
+                          continue
+fi
+fi
+
     as_fn_append PE_ARCHS " $wine_arch"
     { as_ac_var=`printf "%s\n" "ac_cv_${wine_arch}_cflags_-fno-strict-aliasing" | $as_tr_sh`
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -fno-strict-aliasing" >&5

configure.ac

@@ -954,6 +954,19 @@ This is an error since --enable-archs=$wine_arch was requested.])])
           AS_VAR_APPEND([${wine_arch}_CC],[" $res"]) ;;
     esac
 
+    AS_VAR_IF([wine_arch],[i386],[],
+              [AS_VAR_PUSHDEF([wine_cv_seh_support],[ac_cv_${wine_arch}_seh_support])
+               AC_CACHE_CHECK([whether $CC supports SEH directives], wine_cv_seh_support,
+                   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[asm(".text\nac_test:\t.seh_proc ac_test\n\tnop\n\t.seh_stackalloc 16\n\t.seh_endprologue\n\t.seh_endproc");]])],
+                                     [AS_VAR_SET([wine_cv_seh_support],[yes])],[AS_VAR_SET([wine_cv_seh_support],[no])]))
+               AS_VAR_COPY([res],[wine_cv_seh_support])
+               AS_VAR_POPDEF([wine_cv_seh_support])
+               AS_VAR_IF([res],[yes],[],
+                         [AS_VAR_SET_IF([enable_archs],
+                             [AC_MSG_ERROR([The $wine_arch cross-compiler doesn't support SEH directives.
+This is an error since --enable-archs=$wine_arch was requested.])])
+                          continue])])
+
     AS_VAR_APPEND([PE_ARCHS],[" $wine_arch"])
     WINE_TRY_PE_CFLAGS([-fno-strict-aliasing])
     dnl clang needs to be told to fail on unknown options

dlls/ntdll/signal_x86_64.c

@@ -369,7 +369,7 @@ DWORD __cdecl nested_exception_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTR
 /***********************************************************************
  *		exception_handler_call_wrapper
  */
-#ifdef __ASM_SEH_SUPPORTED
+#ifdef __WINE_PE_BUILD
 DWORD WINAPI exception_handler_call_wrapper( EXCEPTION_RECORD *rec, void *frame,
                                       CONTEXT *context, DISPATCHER_CONTEXT *dispatch );
 
@@ -1077,7 +1077,7 @@ DWORD __cdecl unwind_exception_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTR
 /***********************************************************************
  *		unwind_handler_call_wrapper
  */
-#ifdef __ASM_SEH_SUPPORTED
+#ifdef __WINE_PE_BUILD
 DWORD WINAPI unwind_handler_call_wrapper( EXCEPTION_RECORD *rec, void *frame,
                                    CONTEXT *context, DISPATCHER_CONTEXT *dispatch );
 
@@ -1666,7 +1666,7 @@ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer,
 /***********************************************************************
  *           RtlUserThreadStart (NTDLL.@)
  */
-#ifdef __ASM_SEH_SUPPORTED
+#ifdef __WINE_PE_BUILD
 __ASM_GLOBAL_FUNC( RtlUserThreadStart,
                    "subq $0x28,%rsp\n\t"
                    ".seh_stackalloc 0x28\n\t"

include/wine/asm.h

@@ -45,17 +45,8 @@
 # define __ASM_EHABI(str)
 #endif
 
-#if defined(__SEH__) || (defined(_MSC_VER) && defined(__clang__) && (defined(__x86_64__) || defined(__aarch64__)))
-# if defined(__aarch64__) && defined(__clang_major__) && (__clang_major__ < 12 || defined(__apple_build_version__))
-   /* Clang got support for aarch64 SEH assembly directives in Clang 12,
-    * before that, only .seh_startproc/.seh_endproc but nothing else was
-    * supported. Support for it doesn't exist in any Apple branded version
-    * of Clang yet. */
-#  define __ASM_SEH(str)
-# else
-#  define __ASM_SEH(str) str
-#  define __ASM_SEH_SUPPORTED
-# endif
+#if defined(__WINE_PE_BUILD) && !defined(__i386__)
+# define __ASM_SEH(str) str
 #else
 # define __ASM_SEH(str)
 #endif