Retire build support for GCC's DWARF unwinder

As of r356514 LLVM's libunwind is used as the DWARF unwinder on all
supported CPU architectures, and GCC and its libraries will be removed
soon.  Retire the build infrastructure for GCC's unwinder; from here
if there are any unwinder bugs (on any arch) the path forward is to fix
LLVM's libunwind.

3 files changed, 0 insertions, 394 deletions

diff --git a/gnu/lib/Makefile b/gnu/lib/Makefile
index a4a19b704e3c..38399c94a04a 100644
--- a/gnu/lib/Makefile
+++ b/gnu/lib/Makefile
@@ -19,10 +19,6 @@ SUBDIR+=		csu
 SUBDIR+=		libregex
 .endif
 
-.if ${MK_LLVM_LIBUNWIND} == "no"
-SUBDIR+=		libgcc
-.endif
-
 # libsupc++ uses libstdc++ headers, although 'make includes' should
 # have taken care of that already.
 .if ${MK_GNUCXX} != "no"
diff --git a/gnu/lib/libgcc/Makefile b/gnu/lib/libgcc/Makefile
deleted file mode 100644
index 9c5aae96185e..000000000000
--- a/gnu/lib/libgcc/Makefile
+++ /dev/null
@@ -1,374 +0,0 @@
-# $FreeBSD$
-
-PACKAGE=	clibs
-GCCDIR=	${.CURDIR}/../../../contrib/gcc
-GCCLIB=	${.CURDIR}/../../../contrib/gcclibs
-CCDIR=	${.CURDIR}/../../usr.bin/cc
-
-SHLIB_NAME=	libgcc_s.so.1
-SHLIBDIR?=	/lib
-
-.include <src.opts.mk>
-#
-# libgcc is linked in last and thus cannot depend on ssp symbols coming
-# from earlier libraries. Disable stack protection for this library.
-#
-MK_SSP=	no
-
-.include "${CCDIR}/Makefile.tgt"
-.include "${CCDIR}/cc_tools/Makefile.hdrs"
-
-.if ${TARGET_CPUARCH} == "arm"
-CFLAGS+=	-DTARGET_ARM_EABI
-.endif
-
-.PATH: ${GCCDIR}/config/${GCC_CPU} ${GCCDIR}/config ${GCCDIR}
-
-CFLAGS+=	-DIN_GCC -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED \
-		-DHAVE_GTHR_DEFAULT \
-		-I${GCCLIB}/include \
-		-I${GCCDIR}/config -I${GCCDIR} -I. \
-		-I${CCDIR}/cc_tools
-
-LDFLAGS+=	-nodefaultlibs
-LIBADD+=	c
-
-SOBJS=		# added to below in various ways depending on TARGET_CPUARCH
-
-#---------------------------------------------------------------------------
-#
-# Library members defined in libgcc2.c.
-# When upgrading GCC, obtain the following list from mklibgcc.in
-#
-LIB2FUNCS= _muldi3 _negdi2 _lshrdi3 _ashldi3 _ashrdi3 \
-	_cmpdi2 _ucmpdi2 \
-	_enable_execute_stack _trampoline __main _absvsi2 _absvdi2 _addvsi3 \
-	_addvdi3 _subvsi3 _subvdi3 _mulvsi3 _mulvdi3 _negvsi2 _negvdi2 _ctors \
-	_ffssi2 _ffsdi2 _clz _clzsi2 _clzdi2 _ctzsi2 _ctzdi2 _popcount_tab \
-	_popcountsi2 _popcountdi2 _paritysi2 _paritydi2 _powisf2 _powidf2 \
-	_powixf2 _powitf2 _mulsc3 _muldc3 _mulxc3 _multc3 _divsc3 _divdc3 \
-	_divxc3 _divtc3 _bswapsi2 _bswapdi2
-.if ${COMPILER_TYPE} != "clang" || ${TARGET_CPUARCH} != "arm"
-LIB2FUNCS+= _clear_cache
-.endif
-
-# The floating-point conversion routines that involve a single-word integer.
-.for mode in sf df xf
-LIB2FUNCS+= _fixuns${mode}si
-.endfor
-
-# Likewise double-word routines.
-.if ${TARGET_CPUARCH} != "aarch64" && ${TARGET_CPUARCH} != "arm" && \
-    ${TARGET_CPUARCH} != "riscv64"
-# These are implemented in an ARM specific file but will not be filtered out.
-# RISCVTODO: can't compile
-.for mode in sf df xf tf
-LIB2FUNCS+= _fix${mode}di _fixuns${mode}di
-LIB2FUNCS+= _floatdi${mode} _floatundi${mode}
-.endfor
-.endif
-
-LIB2ADD = $(LIB2FUNCS_EXTRA)
-LIB2ADD_ST = $(LIB2FUNCS_STATIC_EXTRA)
-
-
-.if ${TARGET_CPUARCH} == "arm"
-LIB2ADDEH =	unwind-arm.c libunwind-arm.S pr-support.c unwind-c.c
-.else
-LIB2ADDEH = unwind-dw2.c unwind-dw2-fde-glibc.c unwind-sjlj.c gthr-gnat.c \
-	unwind-c.c
-.endif
-
-LIB2ADDEHSTATIC = $(LIB2ADDEH)
-LIB2ADDEHSHARED = $(LIB2ADDEH)
-
-# List of extra C and assembler files to add to static and shared libgcc2.
-# Assembler files should have names ending in `.asm'.
-LIB2FUNCS_EXTRA =
-
-# List of extra C and assembler files to add to static libgcc2.
-# Assembler files should have names ending in `.asm'.
-LIB2FUNCS_STATIC_EXTRA =
-
-# Defined in libgcc2.c, included only in the static library.
-# KAN: Excluded _sf_to_tf and _df_to_tf as TPBIT_FUNCS are not
-# built on any of our platforms.
-LIB2FUNCS_ST = _eprintf __gcc_bcmp
-
-FPBIT_FUNCS = _pack_sf _unpack_sf _addsub_sf _mul_sf _div_sf \
-    _fpcmp_parts_sf _compare_sf _eq_sf _ne_sf _gt_sf _ge_sf \
-    _lt_sf _le_sf _unord_sf _si_to_sf _sf_to_si _negate_sf _make_sf \
-    _sf_to_df _thenan_sf _sf_to_usi _usi_to_sf
-
-DPBIT_FUNCS = _pack_df _unpack_df _addsub_df _mul_df _div_df \
-    _fpcmp_parts_df _compare_df _eq_df _ne_df _gt_df _ge_df \
-    _lt_df _le_df _unord_df _si_to_df _df_to_si _negate_df _make_df \
-    _df_to_sf _thenan_df _df_to_usi _usi_to_df
-
-TPBIT_FUNCS = _pack_tf _unpack_tf _addsub_tf _mul_tf _div_tf \
-    _fpcmp_parts_tf _compare_tf _eq_tf _ne_tf _gt_tf _ge_tf \
-    _lt_tf _le_tf _unord_tf _si_to_tf _tf_to_si _negate_tf _make_tf \
-    _tf_to_df _tf_to_sf _thenan_tf _tf_to_usi _usi_to_tf
-
-# These might cause a divide overflow trap and so are compiled with
-# unwinder info.
-LIB2_DIVMOD_FUNCS = _divdi3 _moddi3 _udivdi3 _umoddi3 _udiv_w_sdiv _udivmoddi4
-
-#-----------------------------------------------------------------------
-#
-#	Platform specific bits.
-#	When upgrading GCC, get the following definitions from config/<cpu>/t-*
-#
-.if ${TARGET_CPUARCH} == "arm"
-#	from config/arm/t-strongarm-elf
-CFLAGS+=	-Dinhibit_libc -fno-inline
-CFLAGS.clang+=	-fheinous-gnu-extensions
-
-LIB1ASMSRC =	lib1funcs.asm
-LIB1ASMFUNCS =  _dvmd_tls _bb_init_func
-# Some compilers generate __aeabi_ functions libgcc_s is missing
-LIBADD+=	compiler_rt
-.endif
-
-.if ${TARGET_CPUARCH} == mips
-LIB2FUNCS_EXTRA = floatunsidf.c floatunsisf.c
-# ABIs other than o32 need this
-.if (${TARGET_ARCH:Mmips64*} != "" || ${TARGET_ARCH:Mmipsn32*} != "") && \
-    !defined(COMPAT_32BIT)
-LIB2FUNCS_EXTRA+= floatdidf.c fixunsdfsi.c
-LIB2FUNCS_EXTRA+= floatdisf.c floatundidf.c
-LIB2FUNCS_EXTRA+= fixsfdi.c floatundisf.c
-LIB2FUNCS_EXTRA+= fixdfdi.c fixunssfsi.c
-.endif
-.endif
-
-.if ${TARGET_ARCH} == "powerpc" || ${TARGET_ARCH} == "powerpcspe"
-#	from config/rs6000/t-ppccomm
-LIB2FUNCS_EXTRA = tramp.asm
-LIB2FUNCS_STATIC_EXTRA = eabi.asm
-.endif
-
-.if ${TARGET_ARCH} == "powerpc64"
-#	from config/rs6000/t-ppccomm
-LIB2FUNCS_EXTRA = tramp.asm
-.endif
-
-.if ${TARGET_CPUARCH} == "sparc64"
-#	from config/sparc/t-elf
-LIB1ASMSRC =   lb1spc.asm
-LIB1ASMFUNCS = _mulsi3 _divsi3 _modsi3
-.endif
-
-#-----------------------------------------------------------------------
-
-# Remove any objects from LIB2FUNCS and LIB2_DIVMOD_FUNCS that are
-# defined as optimized assembly code in LIB1ASMFUNCS.
-.if defined(LIB1ASMFUNCS)
-.for sym in ${LIB1ASMFUNCS}
-LIB2FUNCS:=	${LIB2FUNCS:S/${sym}//g}
-LIB2_DIVMOD_FUNCS:= ${LIB2_DIVMOD_FUNCS:S/${sym}//g}
-.endfor
-.endif
-
-COMMONHDRS=	tm.h tconfig.h options.h gthr-default.h
-COMMONHDRS+=	unwind.h
-
-#-----------------------------------------------------------------------
-#
-# Helpful shortcuts for compiler invocations.
-#
-HIDE =  -fvisibility=hidden -DHIDE_EXPORTS
-CC_T =	${CC} -c ${CFLAGS} ${HIDE} -fPIC
-CC_P =	${CC} -c ${CFLAGS} ${HIDE} -p -fPIC
-CC_S =	${CC} -c ${CFLAGS} ${SHARED_CFLAGS} ${PICFLAG} -DSHARED
-
-#-----------------------------------------------------------------------
-#
-# Functions from libgcc2.c
-#
-STD_CFLAGS =
-DIV_CFLAGS =	-fexceptions -fnon-call-exceptions
-
-STD_FUNCS =	${LIB2FUNCS}
-DIV_FUNCS =	${LIB2_DIVMOD_FUNCS}
-
-STD_CFILE =	libgcc2.c
-DIV_CFILE =	libgcc2.c
-
-OBJ_GRPS =	STD DIV
-
-#-----------------------------------------------------------------------
-#
-# Floating point emulation functions
-#
-.if ${TARGET_CPUARCH} == "armNOT_YET" || \
-    ${TARGET_CPUARCH} == "powerpc" || ${TARGET_CPUARCH} == "sparc64"
-
-FPBIT_CFLAGS =	-DFINE_GRAINED_LIBRARIES -DFLOAT
-DPBIT_CFLAGS =	-DFINE_GRAINED_LIBRARIES
-
-FPBIT_CFILE =	config/fp-bit.c
-DPBIT_CFILE =	config/fp-bit.c
-
-OBJ_GRPS +=	FPBIT DPBIT
-.endif
-
-#-----------------------------------------------------------------------
-#
-# Generic build rules for object groups defined above
-#
-.for T in ${OBJ_GRPS}
-${T}_OBJS_T =	${${T}_FUNCS:S/$/.o/}
-${T}_OBJS_P =	${${T}_FUNCS:S/$/.po/}
-${T}_OBJS_S =	${${T}_FUNCS:S/$/.pico/}
-SOBJS +=	${${T}_FUNCS:S/$/.pico/}
-
-${${T}_OBJS_T}: ${${T}_CFILE} ${COMMONHDRS}
-	${CC_T} ${${T}_CFLAGS} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c:[1]}
-${${T}_OBJS_P}: ${${T}_CFILE} ${COMMONHDRS}
-	${CC_P} ${${T}_CFLAGS} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c:[1]}
-${${T}_OBJS_S}: ${${T}_CFILE} ${COMMONHDRS}
-	${CC_S} ${${T}_CFLAGS} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c:[1]}
-.endfor
-
-#-----------------------------------------------------------------------
-#
-# Extra objects coming from separate files
-#
-.if !empty(LIB2ADD)
-SOBJS +=	${LIB2ADD:R:S/$/.pico/}
-.endif
-
-#-----------------------------------------------------------------------
-#
-# Objects that should be in static library only.
-#
-SYMS_ST =	${LIB2FUNCS_ST}	${LIB2ADD_ST}
-STAT_OBJS_T = 	${SYMS_ST:S/$/.o/}
-STAT_OBJS_P = 	${SYMS_ST:S/$/.po/}
-STATICOBJS  =	${SYMS_ST:S/$/.o/}
-
-${STAT_OBJS_T}:	${STD_CFILE} ${COMMONHDRS}
-	${CC_T} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c:[1]}
-${STAT_OBJS_P}:	${STD_CFILE} ${COMMONHDRS}
-	${CC_P} -DL${.PREFIX} -o ${.TARGET} ${.ALLSRC:M*.c:[1]}
-
-#-----------------------------------------------------------------------
-#
-# Assembler files.
-#
-.if defined(LIB1ASMSRC)
-ASM_T =		${LIB1ASMFUNCS:S/$/.o/}
-ASM_P =		${LIB1ASMFUNCS:S/$/.po/}
-ASM_S =		${LIB1ASMFUNCS:S/$/.pico/}
-ASM_V =		${LIB1ASMFUNCS:S/$/.vis/}
-SOBJS +=	${LIB1ASMFUNCS:S/$/.pico/}
-
-${ASM_T}: ${LIB1ASMSRC} ${.PREFIX}.vis
-	${CC} -x assembler-with-cpp -c ${CFLAGS} -DL${.PREFIX} \
-	    -o ${.TARGET} -include ${.PREFIX}.vis ${.ALLSRC:N*.h:N*.vis}
-${ASM_P}: ${LIB1ASMSRC} ${.PREFIX}.vis
-	${CC} -x assembler-with-cpp -p -c ${CFLAGS} -DL${.PREFIX} \
-	    -o ${.TARGET} -include ${.PREFIX}.vis ${.ALLSRC:N*.h:N*.vis}
-${ASM_S}: ${LIB1ASMSRC}
-	${CC} -x assembler-with-cpp -c ${PICFLAG} ${CFLAGS} -DL${.PREFIX} \
-	    -o ${.TARGET} ${.ALLSRC:N*.h}
-${ASM_V}: ${LIB1ASMSRC}
-	${CC} -x assembler-with-cpp -c ${CFLAGS} -DL${.PREFIX} \
-	    -o ${.PREFIX}.vo ${.ALLSRC:N*.h}
-	( ${NM} -pg ${.PREFIX}.vo | \
-		awk 'NF == 3 && $$2 !~ /^[UN]$$/ { print "\t.hidden ", $$3 }'\
-	) > ${.TARGET}
-
-CLEANFILES += ${ASM_V} ${ASM_V:R:S/$/.vo/}
-.endif
-
-#-----------------------------------------------------------------------
-#
-# Exception handling / unwinding support.
-#
-EH_OBJS_T = ${LIB2ADDEHSTATIC:R:S/$/.o/}
-EH_OBJS_P = ${LIB2ADDEHSTATIC:R:S/$/.po/}
-EH_OBJS_S = ${LIB2ADDEHSHARED:R:S/$/.pico/}
-EH_CFLAGS = -fexceptions -D__GLIBC__=3 -DElfW=__ElfN
-.if ${TARGET_CPUARCH} != "riscv64"
-# RISCVTODO: unwinding support
-SOBJS    += ${EH_OBJS_S}
-.endif
-
-.for _src in ${LIB2ADDEHSTATIC:M*.c}
-${_src:R:S/$/.o/}: ${_src} ${COMMONHDRS}
-	${CC_T} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
-${_src:R:S/$/.po/}: ${_src} ${COMMONHDRS}
-	${CC_P} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
-.endfor
-.for _src in ${LIB2ADDEHSHARED:M*.c}
-${_src:R:S/$/.pico/}: ${_src} ${COMMONHDRS}
-	${CC_S} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
-.endfor
-
-
-CLEANFILES += ${COMMONHDRS}
-CLEANFILES += cs-*.h option*
-
-#-----------------------------------------------------------------------
-#
-# Build symbol version map
-#
-SHLIB_MKMAP      = ${GCCDIR}/mkmap-symver.awk
-SHLIB_MKMAP_OPTS =
-SHLIB_MAPFILES   = ${GCCDIR}/libgcc-std.ver
-.if ${TARGET_CPUARCH} == "arm"
-SHLIB_MAPFILES  += ${GCCDIR}/config/arm/libgcc-bpabi.ver
-.endif
-VERSION_MAP      = libgcc.map
-
-libgcc.map: ${SHLIB_MKMAP} ${SHLIB_MAPFILES} ${SOBJS}
-	(  ${NM} -pg ${SOBJS};echo %% ; \
-	  cat ${SHLIB_MAPFILES} \
-	    | sed -e '/^[   ]*#/d' \
-	          -e 's/^%\(if\|else\|elif\|endif\|define\)/#\1/' \
-	    | ${CC} ${CFLAGS} -E -xassembler-with-cpp -; \
-	) | awk -f ${SHLIB_MKMAP} ${SHLIB_MKMAP_OPTS} > ${.TARGET}
-
-CLEANFILES +=	libgcc.map
-
-#-----------------------------------------------------------------------
-#
-# Build additional static libgcc_eh[_p].a libraries.
-#
-libgcc_eh.a:	${EH_OBJS_T}
-	@${ECHO} building static gcc_eh library
-	@rm -f ${.TARGET}
-	${AR} ${ARFLAGS} ${.TARGET} `lorder ${EH_OBJS_T} | tsort -q`
-	${RANLIB} ${RANLIBFLAGS} ${.TARGET}
-
-_LIBS+= libgcc_eh.a
-
-.if ${MK_PROFILE} != "no"
-libgcc_eh_p.a:	${EH_OBJS_P}
-	@${ECHO} building profiled gcc_eh library
-	@rm -f ${.TARGET}
-	${AR} ${ARFLAGS} ${.TARGET} `lorder ${EH_OBJS_P} | tsort -q`
-	${RANLIB} ${RANLIBFLAGS} ${.TARGET}
-
-_LIBS+= libgcc_eh_p.a
-.endif
-
-_libinstall: _lib-eh-install
-
-_lib-eh-install:
-.if ${MK_INSTALLLIB} != "no"
-	${INSTALL} ${TAG_ARGS} -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
-		${_INSTALLFLAGS} libgcc_eh.a ${DESTDIR}${LIBDIR}
-.endif
-.if ${MK_PROFILE} != "no"
-	${INSTALL} ${TAG_ARGS} -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
-		${_INSTALLFLAGS} libgcc_eh_p.a ${DESTDIR}${LIBDIR}
-.endif
-
-CLEANFILES+=	libgcc_eh.a libgcc_eh_p.a ${EH_OBJS_T} ${EH_OBJS_P}
-
-.include <bsd.lib.mk>
-
-.SUFFIXES: .vis .vo
diff --git a/gnu/lib/libgcc/Makefile.depend b/gnu/lib/libgcc/Makefile.depend
deleted file mode 100644
index 2f6d8d110c49..000000000000
--- a/gnu/lib/libgcc/Makefile.depend
+++ /dev/null
@@ -1,16 +0,0 @@
-# $FreeBSD$
-# Autogenerated - do NOT edit!
-
-DIRDEPS = \
-	gnu/lib/csu \
-	include \
-	include/xlocale \
-	lib/${CSU_DIR} \
-	lib/libc \
-
-
-.include <dirdeps.mk>
-
-.if ${DEP_RELDIR} == ${_DEP_RELDIR}
-# local dependencies - needed for -jN in clean tree
-.endif