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.

1 files changed, 16 insertions, 8 deletions

diff --git a/gas/config/tc-avr.c b/gas/config/tc-avr.c
index bda0bd6..79560ac 100644
--- a/gas/config/tc-avr.c
+++ b/gas/config/tc-avr.c
@@ -345,8 +345,8 @@ struct avr_opt_s
   int all_opcodes;  /* -mall-opcodes: accept all known AVR opcodes.  */
   int no_skip_bug;  /* -mno-skip-bug: no warnings for skipping 2-word insns.  */
   int no_wrap;      /* -mno-wrap: reject rjmp/rcall with 8K wrap-around.  */
-  int link_relax;   /* -mlink-relax: generate relocations for linker
-                       relaxation.  */
+  int no_link_relax;   /* -mno-link-relax / -mlink-relax: generate (or not)
+                          relocations for linker relaxation.  */
 };
 
 static struct avr_opt_s avr_opt = { 0, 0, 0, 0 };
@@ -411,7 +411,8 @@ enum options
   OPTION_NO_SKIP_BUG,
   OPTION_NO_WRAP,
   OPTION_ISA_RMW,
-  OPTION_LINK_RELAX
+  OPTION_LINK_RELAX,
+  OPTION_NO_LINK_RELAX
 };
 
 struct option md_longopts[] =
@@ -422,6 +423,7 @@ struct option md_longopts[] =
   { "mno-wrap",     no_argument, NULL, OPTION_NO_WRAP     },
   { "mrmw",         no_argument, NULL, OPTION_ISA_RMW     },
   { "mlink-relax",  no_argument, NULL, OPTION_LINK_RELAX  },
+  { "mno-link-relax",  no_argument, NULL, OPTION_NO_LINK_RELAX  },
   { NULL, no_argument, NULL, 0 }
 };
 
@@ -528,8 +530,9 @@ md_show_usage (FILE *stream)
 	"  -mno-wrap        reject rjmp/rcall instructions with 8K wrap-around\n"
 	"                   (default for avr3, avr5)\n"
 	"  -mrmw            accept Read-Modify-Write instructions\n"
-    "  -mlink-relax     generate relocations for linker relaxation\n"
-    ));
+	"  -mlink-relax     generate relocations for linker relaxation (default)\n"
+	"  -mno-link-relax  don't generate relocations for linker relaxation.\n"
+        ));
   show_mcu_list (stream);
 }
 
@@ -600,7 +603,10 @@ md_parse_option (int c, char *arg)
       specified_mcu.isa |= AVR_ISA_RMW;
       return 1;
     case OPTION_LINK_RELAX:
-      avr_opt.link_relax = 1;
+      avr_opt.no_link_relax = 0;
+      return 1;
+    case OPTION_NO_LINK_RELAX:
+      avr_opt.no_link_relax = 1;
       return 1;
     }
 
@@ -652,7 +658,7 @@ md_begin (void)
     }
 
   bfd_set_arch_mach (stdoutput, TARGET_ARCH, avr_mcu->mach);
-  linkrelax = avr_opt.link_relax;
+  linkrelax = !avr_opt.no_link_relax;
 }
 
 /* Resolve STR as a constant expression and return the result.
@@ -1239,7 +1245,9 @@ md_pcrel_from_section (fixS *fixp, segT sec)
 static bfd_boolean
 relaxable_section (asection *sec)
 {
-  return (sec->flags & SEC_DEBUGGING) == 0;
+  return ((sec->flags & SEC_DEBUGGING) == 0
+          && (sec->flags & SEC_CODE) != 0
+          && (sec->flags & SEC_ALLOC) != 0);
 }
 
 /* Does whatever the xtensa port does.  */