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, 5 insertions, 1 deletions

diff --git a/ld/ldgram.y b/ld/ldgram.y
index a664258..9973b07 100644
--- a/ld/ldgram.y
+++ b/ld/ldgram.y
@@ -141,7 +141,7 @@ static int error_index;
 %token DEFINED TARGET_K SEARCH_DIR MAP ENTRY
 %token <integer> NEXT
 %token SIZEOF ALIGNOF ADDR LOADADDR MAX_K MIN_K
-%token STARTUP HLL SYSLIB FLOAT NOFLOAT NOCROSSREFS
+%token STARTUP HLL SYSLIB FLOAT NOFLOAT NOCROSSREFS NOCROSSREFS_TO
 %token ORIGIN FILL
 %token LENGTH CREATE_OBJECT_SYMBOLS INPUT GROUP OUTPUT CONSTRUCTORS
 %token ALIGNMOD AT SUBALIGN HIDDEN PROVIDE PROVIDE_HIDDEN AS_NEEDED
@@ -353,6 +353,10 @@ ifile_p1:
 		{
 		  lang_add_nocrossref ($3);
 		}
+	|	NOCROSSREFS_TO '(' nocrossref_list ')'
+		{
+		  lang_add_nocrossref_to ($3);
+		}
 	|	EXTERN '(' extern_name_list ')'
 	|	INSERT_K AFTER NAME
 		{ lang_add_insert ($3, 0); }