[PATCH] backport FreeBSD add functionality to build PIE executables

[Andreas Tobler <andreast-list@fgznet.ch>]

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Hi all,

I'm going to commit this patch to 5.1 in the next days unless someone 
objects.

The patch is in my 5.1 tree since a longer time and I regularly post 
results.

Thanks,
Andreas

2015-06-22  Andreas Tobler  <andreast@gcc.gnu.org>

	Backport from mainline
	2015-05-18  Andreas Tobler  <andreast@gcc.gnu.org>

	* config/freebsd-spec.h (FBSD_STARTFILE_SPEC): Add the bits to build
	pie executables.
	(FBSD_ENDFILE_SPEC): Likewise.
	* config/i386/freebsd.h (STARTFILE_SPEC): Remove and use the one from
	config/freebsd-spec.h.
	(ENDFILE_SPEC): Likewise.

2015-06-22  Andreas Tobler  <andreast@gcc.gnu.org>

	Backport from mainline
	2015-05-12  Andreas Tobler  <andreast@gcc.gnu.org>

	* lib/target-supports.exp (check_effective_target_pie): Add *-*-freebsd*
	to the family of pie capable targets.


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Index: config/freebsd-spec.h
===================================================================
--- config/freebsd-spec.h	(revision 224751)
+++ config/freebsd-spec.h	(working copy)
@@ -66,8 +66,9 @@
   "%{!shared: \
      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
 		       %{!p:%{profile:gcrt1.o%s} \
-			 %{!profile:crt1.o%s}}}} \
-   crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
+			 %{!profile: \
+                            %{pie: Scrt1.o%s;:crt1.o%s}}}}} \
+   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
 
 /* Provide a ENDFILE_SPEC appropriate for FreeBSD.  Here we tack on
    the magical crtend.o file (see crtstuff.c) which provides part of 
@@ -76,7 +77,7 @@
 	`crtn.o'.  */
 
 #define FBSD_ENDFILE_SPEC \
-  "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
+  "%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
 
 /* Provide a LIB_SPEC appropriate for FreeBSD as configured and as
    required by the user-land thread model.  Before __FreeBSD_version
Index: config/i386/freebsd.h
===================================================================
--- config/i386/freebsd.h	(revision 224751)
+++ config/i386/freebsd.h	(working copy)
@@ -59,29 +59,16 @@
 #define SUBTARGET_EXTRA_SPECS \
   { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER }
     
-/* Provide a STARTFILE_SPEC appropriate for FreeBSD.  Here we add
-   the magical crtbegin.o file (see crtstuff.c) which provides part 
-	of the support for getting C++ file-scope static object constructed 
-	before entering `main'.  */
-   
-#undef	STARTFILE_SPEC
-#define STARTFILE_SPEC \
-  "%{!shared: \
-     %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
-		       %{!p:%{profile:gcrt1.o%s} \
-			 %{!profile:crt1.o%s}}}} \
-   crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
+/* Use the STARTFILE_SPEC from config/freebsd-spec.h.  */
 
-/* Provide a ENDFILE_SPEC appropriate for FreeBSD.  Here we tack on
-   the magical crtend.o file (see crtstuff.c) which provides part of 
-	the support for getting C++ file-scope static object constructed 
-	before entering `main', followed by a normal "finalizer" file, 
-	`crtn.o'.  */
+#undef  STARTFILE_SPEC
+#define STARTFILE_SPEC FBSD_STARTFILE_SPEC
 
-#undef	ENDFILE_SPEC
-#define ENDFILE_SPEC \
-  "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
+/* Use the ENDFILE_SPEC from config/freebsd-spec.h.  */
 
+#undef  ENDFILE_SPEC
+#define ENDFILE_SPEC FBSD_ENDFILE_SPEC
+
 /* Provide a LINK_SPEC appropriate for FreeBSD.  Here we provide support
    for the special GCC options -static and -shared, which allow us to
    link things in one of these three modes by applying the appropriate
Index: testsuite/lib/target-supports.exp
===================================================================
--- testsuite/lib/target-supports.exp	(revision 224751)
+++ testsuite/lib/target-supports.exp	(working copy)
@@ -952,6 +952,7 @@
 
 proc check_effective_target_pie { } {
     if { [istarget *-*-darwin\[912\]*]
+	 || [istarget *-*-freebsd*]
 	 || [istarget *-*-linux*]
 	 || [istarget *-*-gnu*] } {
 	return 1;