MIPS/LD/testsuite: Correct PR ld/22649 test case failures

Fix commit d664fd41e15f ("Ignore dynamic references on forced local
symbols") and use alternative test actions and match patterns to
correctly handle messages like:

.../ld/ld-new: Removing unused section '.reginfo' in file 'tmpdir/pr22649-2b.o'

or:

.../ld/ld-new: Removing unused section '.MIPS.options' in file 'tmpdir/pr22649-2b.o'

produced by LD on MIPS targets, removing:

FAIL: Build pr22649-2c.so
FAIL: Build pr22649-2d.so

test suite failures and tightening checks made with `pr22649-2a.so' and
`pr22649-2b.so' test cases.

Keep the original empty action with `pr22649-2c.so' and `pr22649-2d.so'
links and MIPS/ELF targets though, because for them the linker does not
garbage-collect the `.reginfo' section.  This is because the section has
its flags set differently by code in GAS in `md_begin':

    if (strncmp (TARGET_OS, "elf", 3) != 0)
      flags |= SEC_ALLOC | SEC_LOAD;

and consequently BFD linker code in `_bfd_elf_gc_mark_extra_sections':

	  else if (((isec->flags & SEC_DEBUGGING) != 0
		    || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
		   && elf_next_in_group (isec) == NULL)
	    isec->gc_mark = 1;

marks these sections to be kept due to their SEC_ALLOC, SEC_LOAD and
SEC_RELOC flags all being zero (`.reginfo' sections never have
relocations attached).

	ld/
	PR ld/22649
	* testsuite/ld-elf/pr22649-2ab-mips.msg: New stderr output.
	* testsuite/ld-elf/pr22649-2cd-mips.msg: New stderr output.
	* testsuite/ld-elf/shared.exp: Use the new outputs with
	`mips*-*-*' targets.

4 files changed, 27 insertions, 4 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index ad05c54..83c9689 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,5 +1,13 @@
 2018-01-30  Maciej W. Rozycki  <macro@mips.com>
 
+	PR ld/22649
+	* testsuite/ld-elf/pr22649-2ab-mips.msg: New stderr output.
+	* testsuite/ld-elf/pr22649-2cd-mips.msg: New stderr output.
+	* testsuite/ld-elf/shared.exp: Use the new outputs with
+	`mips*-*-*' targets.
+
+2018-01-30  Maciej W. Rozycki  <macro@mips.com>
+
 	* testsuite/ld-elf/comm-data1.sd: Alternatively accept
 	`PRC[0xff02]' in place of a regular section index.
 	* testsuite/ld-elf/pr21703-shared.sd: Likewise `PRC[0xff01]'.
diff --git a/ld/testsuite/ld-elf/pr22649-2ab-mips.msg b/ld/testsuite/ld-elf/pr22649-2ab-mips.msg
new file mode 100644
index 0000000..e27e6e4
--- /dev/null
+++ b/ld/testsuite/ld-elf/pr22649-2ab-mips.msg
@@ -0,0 +1,2 @@
+.*: Removing unused section '\.data' in file 'tmpdir/pr22649-2.\.o'
+.*: Removing unused section '\.(?:reginfo|MIPS\.options)' in file 'tmpdir/pr22649-2.\.o'
diff --git a/ld/testsuite/ld-elf/pr22649-2cd-mips.msg b/ld/testsuite/ld-elf/pr22649-2cd-mips.msg
new file mode 100644
index 0000000..6a7aa77
--- /dev/null
+++ b/ld/testsuite/ld-elf/pr22649-2cd-mips.msg
@@ -0,0 +1 @@
+.*: Removing unused section '\.(?:reginfo|MIPS\.options)' in file 'tmpdir/pr22649-2.\.o'
diff --git a/ld/testsuite/ld-elf/shared.exp b/ld/testsuite/ld-elf/shared.exp
index 3dfcef2..8223d3d 100644
--- a/ld/testsuite/ld-elf/shared.exp
+++ b/ld/testsuite/ld-elf/shared.exp
@@ -97,6 +97,11 @@ run_ld_link_tests [list \
 ]
 
 if { [check_gc_sections_available] } {
+    if [istarget mips*-*-*] {
+	set actions {{ld pr22649-2ab-mips.msg}}
+    } else {
+	set actions {{ld pr22649.msg}}
+    }
     run_ld_link_tests [list \
 	[list \
 	    "Build pr22649-2a.so" \
@@ -104,7 +109,7 @@ if { [check_gc_sections_available] } {
 	    "" \
 	    "$AFLAGS_PIC" \
 	    {pr22649-2a.s} \
-	    {{ld pr22649.msg}} \
+	    $actions \
 	    "pr22649-2a.so" \
 	] \
 	[list \
@@ -113,16 +118,23 @@ if { [check_gc_sections_available] } {
 	    "tmpdir/pr22649-1.so" \
 	    "$AFLAGS_PIC" \
 	    {pr22649-2a.s} \
-	    {{ld pr22649.msg}} \
+	    $actions \
 	    "pr22649-2b.so" \
 	] \
+    ]
+    if { [istarget mips*-*-*] && ![istarget *-*-elf*] } {
+	set actions {{ld pr22649-2cd-mips.msg}}
+    } else {
+	set actions {}
+    }
+    run_ld_link_tests [list \
 	[list \
 	    "Build pr22649-2c.so" \
 	    "$LFLAGS -shared -gc-sections -print-gc-sections" \
 	    "" \
 	    "$AFLAGS_PIC" \
 	    {pr22649-2b.s} \
-	    {} \
+	    $actions \
 	    "pr22649-2b.so" \
 	] \
 	[list \
@@ -131,7 +143,7 @@ if { [check_gc_sections_available] } {
 	    "tmpdir/pr22649-1.so" \
 	    "$AFLAGS_PIC" \
 	    {pr22649-2b.s} \
-	    {} \
+	    $actions \
 	    "pr22649-2b.so" \
 	] \
     ]