4.3/4.4 PATCH: Fix Solaris/x86 bootstrap with Sun ld (PR bootstrap/33100)

[Rainer Orth <ro@techfak.uni-bielefeld.de>]

Solaris/x86 bootstrap with Sun ld has long been broken by a bug in Sun ld
which caused link failures for the amd64 libgcc_s.so.1.

The relevant bug

	http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6685125

has been fixed in recent versions of OpenSolaris, but there's no backport
to Solaris 10 yet.  Therefore I'm offering the following workaround.

A proper fix would require to make the inclusion of i386/t-crtstuff
conditional on the result of an autoconf test, which doesn't seem to be
easily possible in the context of config.gcc.  One might remove the
inclusion from config.gcc completely and handle it in libgcc/configure.ac
instead.  I might try this if it is deemed worthwhile.

The test would look like this:

* minimal testcase:

	.section	.eh_frame,"a",@unwind
	.zero	4
	.section	.jcr,"aw",@progbits
	.zero	8

* assemble/link with

  gcc -m64 -shared -o conftest.so conftest.s

* fails like this:

ld: fatal: unwind table: file /var/tmp//cc9VAy39.o: section .eh_frame: bad cie version 0: offset 0xfffffd7fffdff220

collect2: ld returned 1 exit status

With this patch, it is possible to bootstrap both mainline and the 4.3
branch without problems.

Ok for both?

	Rainer

-----------------------------------------------------------------------------
Rainer Orth, Faculty of Technology, Bielefeld University



Fri Oct 10 16:27:14 2008  Rainer Orth  <ro@TechFak.Uni-Bielefeld.DE>

	PR bootstrap/33100
	* config.gcc (i[34567]86-*-solaris2*): Include i386/t-crtstuff
	only with GNU ld.

Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc	(revision 140759)
+++ gcc/config.gcc	(working copy)
@@ -1205,7 +1205,10 @@ i[34567]86-*-solaris2*)
 	*-*-solaris2.1[0-9]*)
 		tm_file="${tm_file} i386/x86-64.h i386/sol2-10.h"
 		tm_defines="${tm_defines} TARGET_BI_ARCH=1"
-		tmake_file="$tmake_file i386/t-crtstuff i386/t-sol2-10"
+		tmake_file="$tmake_file i386/t-sol2-10"
+		if test x$gnu_ld = xyes; then
+			tmake_file="$tmake_file i386/t-crtstuff"
+		fi
 		need_64bit_hwint=yes
 		case X"${with_cpu}" in
 		Xgeneric|Xcore2|Xnocona|Xx86-64|Xamdfam10|Xbarcelona|Xk8|Xopteron|Xathlon64|Xathlon-fx)