AVR: Assembler now prepares for linker relaxation by default.

Have the assembler prepare for linker relaxation by default.  This
means that users will be able to make use of linker relaxation without
having to adjust the assembler flags, this can make life easier when
compiling libraries.

Having this on by default in the assembler should make no difference to
the assembler code produced, however, some of the debug information will
be slightly less compressed.

A few tests needed to be updated as a result of this change as they
relied on linker relaxation support being off by default.

I've tightened up the definition of which sections can be relaxed on AVR
as part of this commit, the assembler used to think that all
non-debugging sections could be relaxed, when in reality only code
sections can be relaxed for AVR.  The previous definition was not
dangerous, just over cautious.  The new tighter definition allows an
extra test (gas/testsuite/gas/all/forward.d) to continue to pass.

gas/ChangeLog:

	* config/tc-avr.c (struct avr_opt_s): Change link_relax to
	no_link_relax, extend comment.
	(enum options): Add new OPTION_NO_LINK_RELAX.
	(md_longopts): Add entry for -mno-link-relax.
	(md_parse_option): Handle OPTION_NO_LINK_RELAX, and update
	OPTION_LINK_RELAX.
	(md_begin): Initialise linkrelax from no_link_relax.
	(md_show_usage): Include -mno-link-relax option.
	(relaxable_section): Only allocatable code sections can be
	relaxed.
	* config/tc-avr.h (TC_LINKRELAX_FIXUP): Define.

gas/testsuite/ChangeLog:

	* gas/all/gas.exp: Test will not pass on AVR due to linker
	relaxation support.
	* gas/avr/noreloc_withoutrelax.d: Add -mno-link-relax option.
	* gas/avr/link-relax-elf-flag-clear.d: Likewise.

ld/testsuite/ChangeLog:

	* ld/testsuite/ld-avr/relax-elf-flags-02.d: Add -mno-link-relax
	option.
	* ld/testsuite/ld-avr/relax-elf-flags-03.d: Likewise.
	* ld/testsuite/ld-avr/relax-elf-flags-04.d: Likewise.
	* ld/testsuite/ld-avr/relax-elf-flags-05.d: Likewise.
	* ld/testsuite/ld-avr/relax-elf-flags-06.d: Likewise.

6 files changed, 16 insertions, 7 deletions

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index 628c906..d987267 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,12 @@
+2014-12-24  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* ld/testsuite/ld-avr/relax-elf-flags-02.d: Add -mno-link-relax
+	option.
+	* ld/testsuite/ld-avr/relax-elf-flags-03.d: Likewise.
+	* ld/testsuite/ld-avr/relax-elf-flags-04.d: Likewise.
+	* ld/testsuite/ld-avr/relax-elf-flags-05.d: Likewise.
+	* ld/testsuite/ld-avr/relax-elf-flags-06.d: Likewise.
+
 2014-12-24  Alan Modra  <amodra@gmail.com>
 
 	* ld-scripts/defined6.s,
diff --git a/ld/testsuite/ld-avr/relax-elf-flags-02.d b/ld/testsuite/ld-avr/relax-elf-flags-02.d
index 6a008bd..c4d7660 100644
--- a/ld/testsuite/ld-avr/relax-elf-flags-02.d
+++ b/ld/testsuite/ld-avr/relax-elf-flags-02.d
@@ -1,7 +1,7 @@
 #name: AVR, check link-relax flag is clear on partial link (first file)
 #as: -mmcu=avrxmega2
 #ld: -r -mavrxmega2
-#source: relax-elf-flags-a.s
+#source: relax-elf-flags-a.s -mno-link-relax
 #source: relax-elf-flags-b.s -mlink-relax
 #readelf: -h
 #target: avr-*-*
diff --git a/ld/testsuite/ld-avr/relax-elf-flags-03.d b/ld/testsuite/ld-avr/relax-elf-flags-03.d
index 3d2a70d..c75c1df 100644
--- a/ld/testsuite/ld-avr/relax-elf-flags-03.d
+++ b/ld/testsuite/ld-avr/relax-elf-flags-03.d
@@ -2,7 +2,7 @@
 #as: -mmcu=avrxmega2
 #ld: -r -mavrxmega2
 #source: relax-elf-flags-a.s -mlink-relax
-#source: relax-elf-flags-b.s
+#source: relax-elf-flags-b.s -mno-link-relax
 #readelf: -h
 #target: avr-*-*
 
diff --git a/ld/testsuite/ld-avr/relax-elf-flags-04.d b/ld/testsuite/ld-avr/relax-elf-flags-04.d
index e2a9bb6..8fa4574 100644
--- a/ld/testsuite/ld-avr/relax-elf-flags-04.d
+++ b/ld/testsuite/ld-avr/relax-elf-flags-04.d
@@ -1,8 +1,8 @@
 #name: AVR, check link-relax flag is clear on partial link (both files)
 #as: -mmcu=avrxmega2
 #ld: -r -mavrxmega2
-#source: relax-elf-flags-a.s
-#source: relax-elf-flags-b.s
+#source: relax-elf-flags-a.s -mno-link-relax
+#source: relax-elf-flags-b.s -mno-link-relax
 #readelf: -h
 #target: avr-*-*
 
diff --git a/ld/testsuite/ld-avr/relax-elf-flags-05.d b/ld/testsuite/ld-avr/relax-elf-flags-05.d
index 8c41e8d..de62bbb 100644
--- a/ld/testsuite/ld-avr/relax-elf-flags-05.d
+++ b/ld/testsuite/ld-avr/relax-elf-flags-05.d
@@ -1,8 +1,8 @@
 #name: AVR, check link-relax flag is set final link (no inputs relaxable)
 #as: -mmcu=avrxmega2
 #ld: -relax -mavrxmega2
-#source: relax-elf-flags-a.s
-#source: relax-elf-flags-b.s
+#source: relax-elf-flags-a.s -mno-link-relax
+#source: relax-elf-flags-b.s -mno-link-relax
 #readelf: -h
 #target: avr-*-*
 
diff --git a/ld/testsuite/ld-avr/relax-elf-flags-06.d b/ld/testsuite/ld-avr/relax-elf-flags-06.d
index 5d8e3c1..5a8e810 100644
--- a/ld/testsuite/ld-avr/relax-elf-flags-06.d
+++ b/ld/testsuite/ld-avr/relax-elf-flags-06.d
@@ -2,7 +2,7 @@
 #as: -mmcu=avrxmega2
 #ld: -relax -mavrxmega2
 #source: relax-elf-flags-a.s -mlink-relax
-#source: relax-elf-flags-b.s
+#source: relax-elf-flags-b.s -mno-link-relax
 #readelf: -h
 #target: avr-*-*