mingw32.h (CHECK_EXECUTE_STACK_ENABLED): New macro.

2009-10-27  Kai Tietz <kai.tietz@onevision.com>

        PR/41799
        * config/i386/mingw32.h (CHECK_EXECUTE_STACK_ENABLED): New macro.
        * config/i386/mingw.opt: Add fset-stack-executable.
        * config/i386/i386.c (ix86_trampoline_init): Make call to
        emit_library_call conditional, if CHECK_EXECUTE_STACK_ENABLED is
        defined and its value is not zero.
        * doc/invoke.texi

From-SVN: r153606

gcc/ChangeLog

+2009-10-27  Kai Tietz <kai.tietz@onevision.com>
+
+	PR/41799
+	* config/i386/mingw32.h (CHECK_EXECUTE_STACK_ENABLED): New macro.
+	* config/i386/mingw.opt: Add fset-stack-executable.
+	* config/i386/i386.c (ix86_trampoline_init): Make call to
+	emit_library_call conditional, if CHECK_EXECUTE_STACK_ENABLED is
+	defined and its value is not zero.
+	* doc/invoke.texi
+
 2009-10-27  Richard Guenther  <rguenther@suse.de>
 
 	* tree-ssa-structalias.c (find_func_aliases): In IPA mode

gcc/config/i386/i386.c

@@ -20042,6 +20042,9 @@ ix86_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value)
     }
 
 #ifdef ENABLE_EXECUTE_STACK
+#ifdef CHECK_EXECUTE_STACK_ENABLED
+  if (CHECK_EXECUTE_STACK_ENABLED)
+#endif
   emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__enable_execute_stack"),
 		     LCT_NORMAL, VOIDmode, 1, XEXP (m_tramp, 0), Pmode);
 #endif

gcc/config/i386/mingw.opt

@@ -21,3 +21,7 @@
 Wpedantic-ms-format
 C ObjC C++ ObjC++ Var(warn_pedantic_ms_format) Init(1) Warning
 Warn about none ISO msvcrt scanf/printf width extensions
+
+fset-stack-executable
+Common Report Var(flag_setstackexecutable) Init(1) Optimization
+For nested functions on stack executable permission is set.

gcc/config/i386/mingw32.h

@@ -202,6 +202,8 @@ __enable_execute_stack (void *addr)					\
 
 #undef ENABLE_EXECUTE_STACK
 #define ENABLE_EXECUTE_STACK MINGW_ENABLE_EXECUTE_STACK
+#undef  CHECK_EXECUTE_STACK_ENABLED
+#define CHECK_EXECUTE_STACK_ENABLED flag_setstackexecutable
 
 #ifdef IN_LIBGCC2
 #include <windows.h>

gcc/doc/invoke.texi

@@ -877,7 +877,8 @@ See i386 and x86-64 Options.
 
 @emph{i386 and x86-64 Windows Options}
 @gccoptlist{-mconsole -mcygwin -mno-cygwin -mdll
--mnop-fun-dllimport -mthread -municode -mwin32 -mwindows}
+-mnop-fun-dllimport -mthread -municode -mwin32 -mwindows
+-fno-set-stack-executable}
 
 @emph{Xstormy16 Options}
 @gccoptlist{-msim}
@@ -16704,6 +16705,14 @@ specifies that a GUI application is to be generated by
 instructing the linker to set the PE header subsystem type
 appropriately.
 
+@item -fno-set-stack-executable
+@opindex fno-set-stack-executable
+This option is available for MinGW targets. It specifies that
+the executable flag for stack used by nested functions isn't
+set. This is necessary for binaries running in kernel mode of
+Windows, as there the user32 API, which is used to set executable
+privileges, isn't available.
+
 @item -mpe-aligned-commons
 @opindex mpe-aligned-commons
 This option is available for Cygwin and MinGW targets.  It