git: 458f4722bf97 - main - Suppress lld 16 errors about multiply defined symbols in rescue

From: Dimitry Andric <dim_at_FreeBSD.org>
Date: Mon, 17 Apr 2023 16:26:59 UTC 
The branch main has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=458f4722bf974c7fa7961952fcaee146f5a97708

commit 458f4722bf974c7fa7961952fcaee146f5a97708
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2023-04-17 16:25:30 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2023-04-17 16:26:27 +0000

    Suppress lld 16 errors about multiply defined symbols in rescue
    
    lld >= 16 became more strict about multiply defined symbols. Since there
    are many of those in crunchgen'd programs, turn off the check when
    linking the rescue binary.
    
    MFC after:      1 week
---
 rescue/rescue/Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rescue/rescue/Makefile b/rescue/rescue/Makefile
index 2360bf83b781..1f4db1d06b15 100644
--- a/rescue/rescue/Makefile
+++ b/rescue/rescue/Makefile
@@ -13,6 +13,12 @@ MK_PIE=	no
 NO_SHARED=	yes
 CRUNCH_BUILDOPTS+=	MK_PIE=no NO_SHARED=yes
 
+# lld >= 16 became more strict about multiply defined symbols. Since there are
+# many of those in crunchgen'd programs, turn off the check.
+.if ${LINKER_TYPE} == "lld" && ${LINKER_VERSION} >= 160000
+LDFLAGS+=	-Wl,--allow-multiple-definition
+.endif
+
 PROG=	rescue
 BINDIR?=/rescue