config.gcc (powerpc-*): Make t-ppcgas imply usegas.h.

2008-10-21  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/

	* config.gcc (powerpc-*): Make t-ppcgas imply usegas.h.
	* config/svr4.h (SVR4_ASM_SPEC): New.
	(ASM_SPEC): Inherit from SVR4_ASM_SPEC.
	* config/rs6000/sysv4.h (ASM_SPEC): Inherit from SVR4_ASM_SPEC.

	* doc/invoke.texi (Option Summary): Add -T to linker options.
	(Link Options): Document -T.

From-SVN: r141267

5 files changed, 41 insertions, 15 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index de16de0..83cffde 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2008-10-21  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* config.gcc (powerpc-*): Make t-ppcgas imply usegas.h.
+	* config/svr4.h (SVR4_ASM_SPEC): New.
+	(ASM_SPEC): Inherit from SVR4_ASM_SPEC.
+	* config/rs6000/sysv4.h (ASM_SPEC): Inherit from SVR4_ASM_SPEC.
+
+	* doc/invoke.texi (Option Summary): Add -T to linker options.
+	(Link Options): Document -T.
+	
 2008-10-21  Jakub Jelinek  <jakub@redhat.com>
 
 	* tree-inline.c (tree_inlinable_function_p): Remove tuples
diff --git a/gcc/config.gcc b/gcc/config.gcc
index c10e7f9..788e435 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1777,12 +1777,12 @@ powerpc-*-eabisimaltivec*)
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcendian rs6000/t-ppccomm"
 	;;
 powerpc-*-eabisim*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/e500.h rs6000/eabisim.h"
+	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/e500.h rs6000/eabisim.h"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
 	;;
 powerpc-*-elf*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h"
+	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
 	;;
@@ -1792,12 +1792,12 @@ powerpc-*-eabialtivec*)
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcendian rs6000/t-ppccomm"
 	;;
 powerpc-xilinx-eabi*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/singlefp.h"
+	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/singlefp.h"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
 	;;
 powerpc-*-eabi*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/e500.h"
+	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/e500.h"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
 	;;
@@ -1885,22 +1885,22 @@ powerpc-*-lynxos*)
 	gas=yes
 	;;
 powerpcle-*-elf*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/sysv4le.h"
+	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/sysv4le.h"
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	;;
 powerpcle-*-eabisim*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/sysv4le.h rs6000/eabi.h rs6000/e500.h rs6000/eabisim.h"
+	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/sysv4le.h rs6000/eabi.h rs6000/e500.h rs6000/eabisim.h"
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	;;
 powerpcle-*-eabi*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/sysv4le.h rs6000/eabi.h rs6000/e500.h"
+	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/sysv4le.h rs6000/eabi.h rs6000/e500.h"
 	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	;;
 powerpc-xilinx-eabi*)
- 	tm_file="${tm_file} dbxelf.h elfos.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/singlefp.h rs6000/xfpu.h"
+ 	tm_file="${tm_file} dbxelf.h elfos.h usegas.h svr4.h freebsd-spec.h rs6000/sysv4.h rs6000/eabi.h rs6000/singlefp.h rs6000/xfpu.h"
   	extra_options="${extra_options} rs6000/sysv4.opt"
   	tmake_file="rs6000/t-fprules rs6000/t-fprules-fpbit rs6000/t-ppcgas rs6000/t-ppccomm"
   	;;
diff --git a/gcc/config/rs6000/sysv4.h b/gcc/config/rs6000/sysv4.h
index 8e30980..6d89862 100644
--- a/gcc/config/rs6000/sysv4.h
+++ b/gcc/config/rs6000/sysv4.h
@@ -585,9 +585,9 @@ extern int fixuplabelno;
 /* Override svr4.h definition.  */
 #undef	ASM_SPEC
 #define	ASM_SPEC "%(asm_cpu) \
-%{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
-%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} \
-%{mrelocatable} %{mrelocatable-lib} %{fpic|fpie|fPIC|fPIE:-K PIC} \
+%{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
+SVR4_ASM_SPEC \
+"%{mrelocatable} %{mrelocatable-lib} %{fpic|fpie|fPIC|fPIE:-K PIC} \
 %{memb|msdata|msdata=eabi: -memb} \
 %{mlittle|mlittle-endian:-mlittle; \
   mbig|mbig-endian      :-mbig;    \
diff --git a/gcc/config/svr4.h b/gcc/config/svr4.h
index 9e348e0..0082566 100644
--- a/gcc/config/svr4.h
+++ b/gcc/config/svr4.h
@@ -55,7 +55,8 @@ along with GCC; see the file COPYING3.  If not see
   && strcmp (STR, "Tdata") && strcmp (STR, "Ttext")	\
   && strcmp (STR, "Tbss"))
 
-/* Provide an ASM_SPEC appropriate for svr4.  Here we try to support as
+/* Provide an ASM_SPEC appropriate for svr4.
+   If we're not using GAS, we try to support as
    many of the specialized svr4 assembler options as seems reasonable,
    given that there are certain options which we can't (or shouldn't)
    support directly due to the fact that they conflict with other options
@@ -74,9 +75,16 @@ along with GCC; see the file COPYING3.  If not see
    read its stdin.
 */
 
-#undef  ASM_SPEC
-#define ASM_SPEC \
+#ifdef USE_GAS
+#define SVR4_ASM_SPEC \
+  "%{v:-V} %{Wa,*:%*}"
+#else
+#define SVR4_ASM_SPEC \
   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
+#endif
+
+#undef  ASM_SPEC
+#define ASM_SPEC SVR4_ASM_SPEC
 
 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index c05ced4..7319b90d 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -406,7 +406,7 @@ Objective-C and Objective-C++ Dialects}.
 @gccoptlist{@var{object-file-name}  -l@var{library} @gol
 -nostartfiles  -nodefaultlibs  -nostdlib -pie -rdynamic @gol
 -s  -static  -static-libgcc  -shared  -shared-libgcc  -symbolic @gol
--Wl,@var{option}  -Xlinker @var{option} @gol
+-T @var{script}  -Wl,@var{option}  -Xlinker @var{option} @gol
 -u @var{symbol}}
 
 @item Directory Options
@@ -7857,6 +7857,14 @@ about any unresolved references (unless overridden by the link editor
 option @samp{-Xlinker -z -Xlinker defs}).  Only a few systems support
 this option.
 
+@item -T @var{script}
+@opindex T
+@cindex linker script
+Use @var{script} as the linker script.  This option is supported by most
+systems using the GNU linker.  On some targets, such as bare-board
+targets without an operating system, the @option{-T} option may be required 
+when linking to avoid references to undefined symbols.
+
 @item -Xlinker @var{option}
 @opindex Xlinker
 Pass @var{option} as an option to the linker.  You can use this to