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, 2 insertions, 0 deletions

diff --git a/ld/NEWS b/ld/NEWS
index b88da5c..b4abd0b 100644
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -9,6 +9,8 @@
 * Support for -z nodynamic-undefined-weak in the x86 ELF linker, which
   avoids dynamic relocations against undefined weak symbols in executable.
 
+* The NOCROSSREFSTO command was added to the linker script language.
+
 Changes in 2.26:
 
 * Add --fix-stm32l4xx-629360 to the ARM linker to enable a link-time