retire the LLVM_LIBUNWIND option

LLVM's libunwind is used on all FreeBSD-supported CPU architectures and
is a required component.

Reviewed by:	brooks (earlier)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D23123

Makefile.inc1

@@ -2747,7 +2747,7 @@ _prereq_libs+= lib/libssp_nonshared
 
 # These dependencies are not automatically generated:
 #
-# gnu/lib/libgcc, lib/csu and lib/libc must be built before
+# lib/csu and lib/libc must be built before
 # all shared libraries for ELF.
 #
 _startup_libs=	lib/csu
@@ -2757,7 +2757,6 @@ _startup_libs+=	lib/libc_nonshared
 _startup_libs+=	lib/libcxxrt
 .endif
 
-.if ${MK_LLVM_LIBUNWIND} != "no"
 _prereq_libs+=	lib/libgcc_eh lib/libgcc_s
 _startup_libs+=	lib/libgcc_eh lib/libgcc_s
 
@@ -2766,7 +2765,6 @@ lib/libgcc_s__L: lib/libc_nonshared__L
 .if ${MK_LIBCPLUSPLUS} != "no"
 lib/libcxxrt__L: lib/libgcc_s__L
 .endif
-.endif
 
 _prebuild_libs=	${_kerberos5_lib_libasn1} \
 		${_kerberos5_lib_libhdb} \

UPDATING

@@ -26,6 +26,10 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20200229:
+	The WITHOUT_LLVM_LIBUNWIND option has been removed.  LLVM's libunwind
+	is used by all supported CPU architectures.
+
 20200229:
 	GCC 4.2.1 has been removed from the tree.  The WITH_GCC,
 	WITH_GCC_BOOTSTRAP, and WITH_GNUCXX options are no longer available.

contrib/bmake/mk/meta2deps.sh

@@ -49,7 +49,6 @@
 #	The output, is a set of absolute paths with "SB" like:
 #.nf
 #
-#	$SB/obj-i386/bsd/gnu/lib/libgcc
 #	$SB/obj-i386/bsd/include
 #	$SB/obj-i386/bsd/lib/csu/i386
 #	$SB/obj-i386/bsd/lib/libc

lib/Makefile

@@ -53,6 +53,8 @@ SUBDIR=	${SUBDIR_BOOTSTRAP} \
 	libexpat \
 	libfetch \
 	libfigpar \
+	libgcc_eh \
+	libgcc_s \
 	libgeom \
 	libifconfig \
 	libipsec \
@@ -177,8 +179,6 @@ _libcplusplus+=	libc++experimental
 SUBDIR.${MK_EFI}+=	libefivar
 SUBDIR.${MK_GOOGLETEST}+=	googletest
 SUBDIR.${MK_LIBTHR}+=	libthr
-SUBDIR.${MK_LLVM_LIBUNWIND}+=	libgcc_eh
-SUBDIR.${MK_LLVM_LIBUNWIND}+=	libgcc_s
 SUBDIR.${MK_NETGRAPH}+=	libnetgraph
 SUBDIR.${MK_NIS}+=	libypclnt
 

share/mk/local.dirdeps.mk

@@ -91,13 +91,9 @@ DIRDEPS += \
 # Add both gcc_s and gcc_eh as dependencies as the decision to build
 # -static or not is not known here.
 .if ${DEP_RELDIR:M*libgcc*} == "" && ${DIRDEPS:U:Mlib/libc} != ""
-.if ${MK_LLVM_LIBUNWIND} == "yes"
 DIRDEPS+= \
 	lib/libgcc_eh \
 	lib/libgcc_s
-.else
-DIRDEPS+= gnu/lib/libgcc
-.endif
 .endif
 
 # Bootstrap support.  Give hints to DIRDEPS if there is no Makefile.depend*

share/mk/local.gendirdeps.mk

@@ -10,7 +10,6 @@ GENDIRDEPS_FILTER+= \
 	Nlib/libssp_nonshared \
 	Ncddl/usr.bin/ctf* \
 	Nlib/libc_nonshared \
-	Ngnu/lib/libgcc \
 	Nlib/libgcc_eh \
 	Nlib/libgcc_s \
 	Nstand/libsa/* \

share/mk/meta2deps.sh

@@ -49,7 +49,6 @@
 #	The output, is a set of absolute paths with "SB" like:
 #.nf
 #
-#	$SB/obj-i386/bsd/gnu/lib/libgcc
 #	$SB/obj-i386/bsd/include
 #	$SB/obj-i386/bsd/lib/csu/i386
 #	$SB/obj-i386/bsd/lib/libc

share/mk/src.opts.mk

@@ -127,7 +127,6 @@ __DEFAULT_YES_OPTIONS = \
     LIBPTHREAD \
     LIBTHR \
     LLVM_COV \
-    LLVM_LIBUNWIND \
     LLVM_TARGET_ALL \
     LOADER_GELI \
     LOADER_LUA \
@@ -423,7 +422,6 @@ MK_${var}:=	no
 #
 .if !${COMPILER_FEATURES:Mc++11}
 MK_GOOGLETEST:=	no
-MK_LLVM_LIBUNWIND:=	no
 .endif
 
 .if ${MK_CAPSICUM} == "no"

targets/pseudo/userland/gnu/Makefile.depend

@@ -37,7 +37,4 @@ DIRDEPS = \
 DIRDEPS+= gnu/usr.bin/dtc
 .endif
 
-.if ${MK_LLVM_LIBUNWIND} == "no"
-.endif
-
 .include <dirdeps.mk>

targets/pseudo/userland/lib/Makefile.depend

@@ -237,11 +237,9 @@ DIRDEPS+= lib/libgpio
 DIRDEPS+= lib/libefivar
 .endif
 
-.if ${MK_LLVM_LIBUNWIND} != "no"
 DIRDEPS+= \
 	lib/libgcc_eh \
 	lib/libgcc_s
-.endif
 
 .if ${MK_PMC} != "no"
 DIRDEPS+= \

tools/build/options/WITHOUT_LLVM_LIBUNWIND

@@ -1,2 +0,0 @@
-.\" $FreeBSD$
-Set to use GCC's stack unwinder (instead of LLVM's libunwind).

tools/build/options/WITH_LLVM_LIBUNWIND

@@ -1,2 +0,0 @@
-.\" $FreeBSD$
-Set to use LLVM's libunwind stack unwinder (instead of GCC's unwinder).