FYI: amd64 built with WITH_LLD_IS_LD= vs. devel/libunwind : cannot preempt symbol (for various symbols)

Context: amd64 FreeBSD -r316952 as a VirtualBox guest
that was built using WITH_LLD_IS_LD= . ports -r438577.

x11/xorg-minimal indirectly gets to devel/libunwind and
devel/libunwind fails to build from source:


--- Lperf-simple ---
libtool: link: cc -O2 -pipe -g -fstack-protector -fno-strict-aliasing -fexceptions -Wall -Wsign-compare -fstack-protector -o .libs/Lperf-simple Lperf-simple.o  ../src/.libs/libunwind.so -lgcc -llzma -Wl,-rpath -Wl,/usr/local/lib
/usr/bin/ld: error: ./Gperf-simple.c:195: cannot preempt symbol '_ULx86_64_init_local' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:219: cannot preempt symbol '_ULx86_64_init_local' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:252: cannot preempt symbol '_ULx86_64_local_addr_space' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:252: cannot preempt symbol '_ULx86_64_set_caching_policy' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:255: cannot preempt symbol '_ULx86_64_local_addr_space' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:255: cannot preempt symbol '_ULx86_64_set_caching_policy' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:258: cannot preempt symbol '_ULx86_64_local_addr_space' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:258: cannot preempt symbol '_ULx86_64_set_caching_policy' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:66: cannot preempt symbol '_ULx86_64_init_local' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-simple.c:73: cannot preempt symbol '_ULx86_64_step' defined in ../src/.libs/libunwind.so
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** [Lperf-simple] Error code 1

make[2]: stopped in /usr/obj/portswork/usr/ports/devel/libunwind/work/libunwind-1.1/tests
--- Lperf-trace ---
libtool: link: cc -O2 -pipe -g -fstack-protector -fno-strict-aliasing -fexceptions -Wall -Wsign-compare -fstack-protector -o .libs/Lperf-trace Lperf-trace.o  ../src/.libs/libunwind.so -lgcc -llzma -Wl,-rpath -Wl,/usr/local/lib
--- Gperf-simple ---
libtool: link: cc -O2 -pipe -g -fstack-protector -fno-strict-aliasing -fexceptions -Wall -Wsign-compare -fstack-protector -o .libs/Gperf-simple Gperf-simple.o  ../src/.libs/libunwind-x86_64.so /usr/obj/portswork/usr/ports/devel/libunwind/work/libunwind-1.1/src/.libs/libunwind.so ../src/.libs/libunwind.so -lgcc -llzma -Wl,-rpath -Wl,/usr/local/lib
--- Lperf-trace ---
/usr/bin/ld: error: ./Gperf-trace.c:181: cannot preempt symbol '_ULx86_64_init_local' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-trace.c:205: cannot preempt symbol '_ULx86_64_init_local' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-trace.c:238: cannot preempt symbol '_ULx86_64_local_addr_space' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-trace.c:238: cannot preempt symbol '_ULx86_64_set_caching_policy' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-trace.c:241: cannot preempt symbol '_ULx86_64_local_addr_space' defined in ../src/.libs/libunwind.so
--- Gperf-trace ---
libtool: link: cc -O2 -pipe -g -fstack-protector -fno-strict-aliasing -fexceptions -Wall -Wsign-compare -fstack-protector -o .libs/Gperf-trace Gperf-trace.o  ../src/.libs/libunwind-x86_64.so /usr/obj/portswork/usr/ports/devel/libunwind/work/libunwind-1.1/src/.libs/libunwind.so ../src/.libs/libunwind.so -lgcc -llzma -Wl,-rpath -Wl,/usr/local/lib
--- Lperf-trace ---
/usr/bin/ld: error: ./Gperf-trace.c:241: cannot preempt symbol '_ULx86_64_set_caching_policy' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-trace.c:244: cannot preempt symbol '_ULx86_64_local_addr_space' defined in ../src/.libs/libunwind.so
/usr/bin/ld: error: ./Gperf-trace.c:244: cannot preempt symbol '_ULx86_64_set_caching_policy' defined in ../src/.libs/libunwind.so
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** [Lperf-trace] Error code 1

make[2]: stopped in /usr/obj/portswork/usr/ports/devel/libunwind/work/libunwind-1.1/tests
--- Gperf-simple ---
/usr/bin/ld: error: Gperf-simple.c:195: cannot preempt symbol '_Ux86_64_init_local' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:219: cannot preempt symbol '_Ux86_64_init_local' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:252: cannot preempt symbol '_Ux86_64_local_addr_space' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:252: cannot preempt symbol '_Ux86_64_set_caching_policy' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:255: cannot preempt symbol '_Ux86_64_local_addr_space' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:255: cannot preempt symbol '_Ux86_64_set_caching_policy' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:258: cannot preempt symbol '_Ux86_64_local_addr_space' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:258: cannot preempt symbol '_Ux86_64_set_caching_policy' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:66: cannot preempt symbol '_Ux86_64_init_local' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-simple.c:73: cannot preempt symbol '_Ux86_64_step' defined in ../src/.libs/libunwind-x86_64.so
--- Gperf-trace ---
/usr/bin/ld: error: Gperf-trace.c:181: cannot preempt symbol '_Ux86_64_init_local' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-trace.c:205: cannot preempt symbol '_Ux86_64_init_local' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-trace.c:238: cannot preempt symbol '_Ux86_64_local_addr_space' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-trace.c:238: cannot preempt symbol '_Ux86_64_set_caching_policy' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-trace.c:241: cannot preempt symbol '_Ux86_64_local_addr_space' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-trace.c:241: cannot preempt symbol '_Ux86_64_set_caching_policy' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-trace.c:244: cannot preempt symbol '_Ux86_64_local_addr_space' defined in ../src/.libs/libunwind-x86_64.so
/usr/bin/ld: error: Gperf-trace.c:244: cannot preempt symbol '_Ux86_64_set_caching_policy' defined in ../src/.libs/libunwind-x86_64.so
--- Gperf-simple ---
cc: error: linker command failed with exit code 1 (use -v to see invocation)
--- Gperf-trace ---
cc: error: linker command failed with exit code 1 (use -v to see invocation)
--- Gperf-simple ---
*** [Gperf-simple] Error code 1

make[2]: stopped in /usr/obj/portswork/usr/ports/devel/libunwind/work/libunwind-1.1/tests
--- Gperf-trace ---
*** [Gperf-trace] Error code 1


I do have:

# svnlite diff /usr/ports/Mk
Index: /usr/ports/Mk/bsd.port.mk
===================================================================
--- /usr/ports/Mk/bsd.port.mk	(revision 436747)
+++ /usr/ports/Mk/bsd.port.mk	(working copy)
_at__at_ -1646,7 +1646,11 _at__at_
 STRIP_CMD=	${TRUE}
 .endif
 DEBUG_FLAGS?=	-g
+.if defined(ALLOW_OPTIMIZATIONS_FOR_WITH_DEBUG)
+CFLAGS:=		${CFLAGS} ${DEBUG_FLAGS}
+.else
 CFLAGS:=		${CFLAGS:N-O*:N-fno-strict*} ${DEBUG_FLAGS}
+.endif
 .if defined(INSTALL_TARGET)
 INSTALL_TARGET:=	${INSTALL_TARGET:S/^install-strip$/install/g}
 .endif

and use ALLOW_OPTIMIZATIONS_FOR_WITH_DEBUG= and WITH_DEBUG= :

# more /etc/make.conf 
WANT_QT_VERBOSE_CONFIGURE=1
#
DEFAULT_VERSIONS+=perl5=5.24
WRKDIRPREFIX=/usr/obj/portswork
#
# From a local /usr/ports/Mk/bsd.port.mk extension:
ALLOW_OPTIMIZATIONS_FOR_WITH_DEBUG=
#
.if ${.CURDIR:M*/devel/*llvm*}
#WITH_DEBUG=
.elif ${.CURDIR:M*/www/webkit-qt5*}
#WITH_DEBUG=
.else
WITH_DEBUG=
.endif
WITH_DEBUG_FILES=
MALLOC_PRODUCTION=


===
Mark Millard
markmi at dsl-only.net