Add new NOCROSSREFS_TO linker script command

NOCROSSREFS_TO is similar to the existing NOCROSSREFS command but only
checks one direction of cross referencing.

ld/ChangeLog

	* ld.texinfo: Document NOCROSSREFS_TO script command.
	* ldlang.h (struct lang_nocrossrefs): Add onlyfirst field.
	(lang_add_nocrossref_to): New prototype.
	* ldcref.c (check_local_sym_xref): Use onlyfirst to only look for
	symbols defined in the first section.
	(check_nocrossref): Likewise.
	* ldgram.y (NOCROSSREFS_TO): New script command.
	* ldlang.c (lang_add_nocrossref): Set onlyfirst to FALSE.
	(lang_add_nocrossref_to): New function.
	* ldlex.l (NOCROSSREFS_TO): New token.
	* NEWS: Mention NOCROSSREFS_TO.
	* testsuite/ld-scripts/cross4.t: New file.
	* testsuite/ld-scripts/cross5.t: Likewise.
	* testsuite/ld-scripts/cross6.t: Likewise.
	* testsuite/ld-scripts/cross7.t: Likewise.
	* testsuite/ld-scripts/crossref.exp: Run 4 new NOCROSSREFS_TO
	tests.

1 files changed, 64 insertions, 0 deletions

diff --git a/ld/testsuite/ld-scripts/crossref.exp b/ld/testsuite/ld-scripts/crossref.exp
index 7244b90..4371320 100644
--- a/ld/testsuite/ld-scripts/crossref.exp
+++ b/ld/testsuite/ld-scripts/crossref.exp
@@ -22,11 +22,19 @@
 set test1 "NOCROSSREFS 1"
 set test2 "NOCROSSREFS 2"
 set test3 "NOCROSSREFS 3"
+set test4 "NOCROSSREFS_TO 1"
+set test5 "NOCROSSREFS_TO 2"
+set test6 "NOCROSSREFS_TO 3"
+set test7 "NOCROSSREFS_TO 4"
 
 if { ![is_remote host] && [which $CC] == 0 } {
     untested $test1
     untested $test2
     untested $test3
+    untested $test4
+    untested $test5
+    untested $test6
+    untested $test7
     return
 }
 
@@ -158,5 +166,61 @@ if [string match "" $exec_output] then {
     fail $test3
 }
 
+set exec_output [run_host_cmd "$ld" "$flags -o tmpdir/cross4 -T $srcdir/$subdir/cross4.t tmpdir/cross4.o"]
+set exec_output [prune_warnings $exec_output]
+
+regsub -all "(^|\n)($ld: warning: cannot find entry symbol\[^\n\]*\n?)" $exec_output "\\1" exec_output
+
+if [string match "" $exec_output] then {
+    pass $test4
+} else {
+    verbose -log "$exec_output"
+    fail $test4
+}
+
+set exec_output [run_host_cmd "$ld" "$flags -o tmpdir/cross5 -T $srcdir/$subdir/cross5.t tmpdir/cross4.o"]
+set exec_output [prune_warnings $exec_output]
+
+regsub -all "(^|\n)($ld: warning: cannot find entry symbol\[^\n\]*\n?)" $exec_output "\\1" exec_output
+
+if [string match "" $exec_output] then {
+    fail $test5
+} else {
+    verbose -log "$exec_output"
+    if [regexp "prohibited cross reference from .* to `.*' in" $exec_output] {
+	pass $test5
+    } else {
+	fail $test5
+    }
+}
+
+set exec_output [run_host_cmd "$ld" "$flags -o tmpdir/cross6 -T $srcdir/$subdir/cross6.t tmpdir/cross3.o"]
+set exec_output [prune_warnings $exec_output]
+
+regsub -all "(^|\n)($ld: warning: cannot find entry symbol\[^\n\]*\n?)" $exec_output "\\1" exec_output
+
+if [string match "" $exec_output] then {
+    pass $test6
+} else {
+    verbose -log "$exec_output"
+    fail $test6
+}
+
+set exec_output [run_host_cmd "$ld" "$flags -o tmpdir/cross7 -T $srcdir/$subdir/cross7.t tmpdir/cross3.o"]
+set exec_output [prune_warnings $exec_output]
+
+regsub -all "(^|\n)($ld: warning: cannot find entry symbol\[^\n\]*\n?)" $exec_output "\\1" exec_output
+
+if [string match "" $exec_output] then {
+    fail $test7
+} else {
+    verbose -log "$exec_output"
+    if [regexp "prohibited cross reference from .* to `.*' in" $exec_output] {
+	pass $test7
+    } else {
+	fail $test7
+    }
+}
+
 set CFLAGS "$old_CFLAGS"
 set CC "$old_CC"