PATCH: nonexec stack for wine libraries

[Marcus Meissner]

Hi,

This makes our libraries compile marked as not needed an executeable
stack.

Its not yet fully making it non-x, but its a step.

To confirm that behaviour changed, run:
readelf -a foo.dll.so|grep GNU_STACK

It will change from RWE flags to RW flags.

Ciao, Marcus

Changelog:
	Add a .note.GNU-stack section to our generated
	assembler files to allow non-executable stacks.

Index: configure.ac
===================================================================
RCS file: /home/wine/wine/configure.ac,v
retrieving revision 1.422
diff -u -r1.422 configure.ac
--- configure.ac	14 Jan 2006 17:00:26 -0000	1.422
+++ configure.ac	20 Jan 2006 10:50:50 -0000
@@ -90,6 +90,21 @@
 AC_PATH_XTRA
 AC_PROG_LEX
 
+AC_MSG_CHECKING([if $AS can emit a .note.GNU-section]);
+rm -f conf$$.s
+cat > conf$$.s <<EOF
+	.section .note.GNU-stack,"", at progbits
+	.previous
+
+EOF
+if $AS conf$$.s -o conf$$.o; then
+	AC_MSG_RESULT([yes])
+	AC_DEFINE(HAVE_GNUSTACK,1,[Define if your assembler understands .section .note.GNU-stack,"", at progbits])
+else
+	AC_MSG_RESULT([no])
+fi
+rm -f conf$$.s conf$$.o
+
 dnl **** Just additional warning checks, since AC_PROG just sets 'lex' even
 dnl **** without one present.
 AC_CHECK_PROGS(XLEX,$LEX flex lex,none)
Index: tools/winebuild/utils.c
===================================================================
RCS file: /home/wine/wine/tools/winebuild/utils.c,v
retrieving revision 1.40
diff -u -r1.40 utils.c
--- tools/winebuild/utils.c	19 Dec 2005 09:24:10 -0000	1.40
+++ tools/winebuild/utils.c	20 Jan 2006 10:50:50 -0000
@@ -202,6 +202,11 @@
         fprintf( outfile, "/* File generated automatically; do not edit! */\n" );
     fprintf( outfile,
              "/* This file can be copied, modified and distributed without restriction. */\n\n" );
+
+#ifdef HAVE_GNUSTACK
+    fprintf (outfile,".section .note.GNU-stack,\"\", at progbits\n");
+    fprintf (outfile,".previous\n");
+#endif
 }
 
 /* dump a byte stream into the assembly code */