In order to reslve a long-standing issue with inter-operation
with libSystem, we have bumped the SO name for libgcc_s.
Distributions might wish to install this new version into a
structure where exisiting code is already linked with the
compiler-local libgcc_s.1 (providing symbols exported by the
now-retired libgcc_ext.10.x shims).
The replacement libgcc_s.1 forwards the symbols from the new SO.
In order to support DYLD_LIBRARY_PATH on systems (where it works)
we forward the libSystem unwinder symbols from 10.7+ and a
compiler-local version of the libgcc unwinder on earlier.
For macOS 10.4 to 10.6 this is 'bug-compatible' with existing uses.
For 10.7+ the behaviour will now actually be correct.
This should be squashed with the initial libgcc changes for PR80556
in any backport (r12-5418-gd4943ce939d).
tested on powerpc, i686, x86_64 and aarch64 (where this will be a NOP
since there are no historical uses to cater for).
pushed to master, thanks
Iain
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgcc/ChangeLog:
* config.host (*-*-darwin*): Add logic to build a shared
unwinder library for Darwin8-10.
* config/i386/t-darwin: Build legacy libgcc_s.1.
* config/rs6000/t-darwin: Likewise.
* config/t-darwin: Reorganise the EH fragments to place
them for inclusion in a shared EH lib.
* config/t-slibgcc-darwin: Build a legacy libgcc_s.1 and
the supporting pieces (all FAT libs).
* config/t-darwin-noeh: Removed.
* config/darwin-unwind.ver: New file.
* config/rs6000/t-darwin-ehs: New file.
* config/t-darwin-ehs: New file.
---
libgcc/config.host | 13 ++-
libgcc/config/darwin-unwind.ver | 30 +++++++
libgcc/config/i386/t-darwin | 3 +
libgcc/config/rs6000/t-darwin | 3 +
libgcc/config/rs6000/t-darwin-ehs | 5 ++
libgcc/config/t-darwin | 19 ++++-
libgcc/config/t-darwin-ehs | 4 +
libgcc/config/t-darwin-noeh | 4 -
libgcc/config/t-slibgcc-darwin | 130 ++++++++++++++++++++++++++----
9 files changed, 186 insertions(+), 25 deletions(-)
create mode 100644 libgcc/config/darwin-unwind.ver
create mode 100644 libgcc/config/rs6000/t-darwin-ehs
create mode 100644 libgcc/config/t-darwin-ehs
delete mode 100644 libgcc/config/t-darwin-noeh
@@ -215,10 +215,17 @@ case ${host} in
*-*-darwin*)
asm_hidden_op=.private_extern
tmake_file="$tmake_file t-darwin ${cpu_type}/t-darwin t-libgcc-pic"
- extra_parts="crt3.o libd10-uwfef.a crttms.o crttme.o libemutls_w.a"
# The unwinder is provided by the system shared libraries, do not add one
- # to the shared libgcc.
- tmake_file="$tmake_file t-darwin-noeh t-slibgcc-darwin"
+ # to the shared libgcc but, for older systems, we build a shared unwinder
+ # separately so that we can construct a libgcc_s.1 to use for binaries
+ # linked against the old libgcc_ext.10.x stubs.
+ case ${host} in
+ *-*-darwin[89]* | *-*-darwin10*)
+ tmake_file="$tmake_file t-darwin-ehs ${cpu_type}/t-darwin-ehs"
+ ;;
+ esac
+ tmake_file="$tmake_file t-slibgcc-darwin"
+ extra_parts="crt3.o libd10-uwfef.a crttms.o crttme.o libemutls_w.a"
;;
*-*-dragonfly*)
tmake_file="$tmake_file t-crtstuff-pic t-libgcc-pic t-eh-dw2-dip"
new file mode 100644
@@ -0,0 +1,30 @@
+# unwinder
+__Unwind_DeleteException
+__Unwind_Find_FDE
+__Unwind_ForcedUnwind
+__Unwind_GetGR
+__Unwind_GetIP
+__Unwind_GetLanguageSpecificData
+__Unwind_GetRegionStart
+__Unwind_GetTextRelBase
+__Unwind_GetDataRelBase
+__Unwind_RaiseException
+__Unwind_Resume
+__Unwind_SetGR
+__Unwind_SetIP
+__Unwind_FindEnclosingFunction
+__Unwind_GetCFA
+__Unwind_Backtrace
+__Unwind_Resume_or_Rethrow
+__Unwind_GetIPInfo
+
+___register_frame
+___register_frame_table
+___register_frame_info
+___register_frame_info_bases
+___register_frame_info_table
+___register_frame_info_table_bases
+
+___deregister_frame
+___deregister_frame_info
+___deregister_frame_info_bases
@@ -4,3 +4,6 @@ LIB2FUNCS_EXCLUDE = _fixtfdi _fixunstfdi _floatditf _floatunditf
# Extra symbols for this port.
SHLIB_MAPFILES += $(srcdir)/config/i386/libgcc-darwin.ver
+
+# Build a legacy libgcc_s.1
+BUILD_LIBGCCS1 = YES
@@ -56,3 +56,6 @@ unwind-dw2_s.o: HOST_LIBGCC2_CFLAGS += -maltivec
unwind-dw2.o: HOST_LIBGCC2_CFLAGS += -maltivec
LIB2ADDEH += $(srcdir)/config/rs6000/darwin-fallback.c
+
+# Build a legacy libgcc_s.1
+BUILD_LIBGCCS1 = YES
new file mode 100644
@@ -0,0 +1,5 @@
+# We need the save_world code for the EH library.
+
+LIBEHSOBJS += darwin-world_s.o
+
+$(LIBEHSOBJS): libef_ppc.a
@@ -11,10 +11,6 @@ crttms.o: $(srcdir)/config/darwin-crt-tm.c
crttme.o: $(srcdir)/config/darwin-crt-tm.c
$(crt_compile) -mmacosx-version-min=10.4 -DEND -c $<
-# Use unwind-dw2-fde-darwin
-LIB2ADDEH = $(srcdir)/unwind-dw2.c $(srcdir)/config/unwind-dw2-fde-darwin.c \
- $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
-
# Make emutls weak so that we can deal with -static-libgcc, override the
# hidden visibility when this is present in libgcc_eh.
emutls.o: HOST_LIBGCC2_CFLAGS += \
@@ -38,5 +34,20 @@ libd10-uwfef.a: d10-uwfef.o
$(AR_CREATE_FOR_TARGET) $@ d10-uwfef.o
$(RANLIB_FOR_TARGET) $@
+###### Unwinder #######
+# Most Darwin versions get their unwinder from libSystem; older versions
+# have an installed /usr/lib/libgcc_s.1.dylib.
+# So do not add the unwinder to the shared libgcc.
+LIB2ADDEHSHARED =
+
+# We still need it in the _eh.a for earlier platform versions.
+# Use unwind-dw2-fde-darwin
+LIB2ADDEH = $(srcdir)/unwind-dw2.c \
+ $(srcdir)/config/unwind-dw2-fde-darwin.c \
+ $(srcdir)/unwind-c.c
+
+# Do not build a shared unwind lib by default.
+LIBEHSOBJS=
+
# Symbols for all the sub-ports.
SHLIB_MAPFILES = libgcc-std.ver $(srcdir)/config/libgcc-libsystem.ver
new file mode 100644
@@ -0,0 +1,4 @@
+# Build the unwinder separately so that we can construct a replacement for
+# libgcc_s.1 on systems that used the unwinder in libgcc_s.
+
+LIBEHSOBJS = unwind-dw2_s.o unwind-dw2-fde-darwin_s.o unwind-c_s.o
deleted file mode 100644
@@ -1,4 +0,0 @@
-# Most Darwin versions get their unwinder from libSystem.
-# so remove the unwinder from the shared lib.
-# We still need it in the _eh.a for Darwin8/9.
-LIB2ADDEHSHARED =
@@ -2,11 +2,17 @@
SHLIB_SOVERSION = 1.1
SHLIB_SO_MINVERSION = 1
-SHLIB_VERSTRING = -compatibility_version $(SHLIB_SO_MINVERSION) -current_version $(SHLIB_SOVERSION)
+SHLIB_VERSTRING = -compatibility_version $(SHLIB_SO_MINVERSION) \
+ -current_version $(SHLIB_SOVERSION)
SHLIB_EXT = .dylib
SHLIB_LC = -lSystem
+SHLIB_INSTALL_DIR = $(slibdir)
-# Shorthand expressions for the LINK below.
+SHLIB_MKMAP = $(srcdir)/mkmap-flat.awk
+SHLIB_MKMAP_OPTS = -v leading_underscore=1
+
+# Shorthand expressions for the LINK below, these are substituted in the
+# link expression.
SHLIB_INSTALL_NAME = @shlib_base_name@.$(SHLIB_SOVERSION)$(SHLIB_EXT)
SHLIB_MAP = @shlib_map_file@
SHLIB_DIR = @multilib_dir@
@@ -18,23 +24,64 @@ SHLIB_SONAME = @shlib_base_name@$(SHLIB_EXT)
# library, that is what we eventually install.
SHLIB_LINK = $(CC) $(LIBGCC2_CFLAGS) $(LDFLAGS) -dynamiclib -nodefaultlibs \
- -install_name @shlib_slibdir@/$(SHLIB_INSTALL_NAME) \
+ -install_name $(SHLIB_INSTALL_DIR)/$(SHLIB_INSTALL_NAME) \
-single_module -o $(SHLIB_DIR)/$(SHLIB_SONAME) \
-Wl,-exported_symbols_list,$(SHLIB_MAP) \
$(SHLIB_VERSTRING) \
@multilib_flags@ @shlib_objs@ $(SHLIB_LC)
-SHLIB_MKMAP = $(srcdir)/mkmap-flat.awk
-SHLIB_MKMAP_OPTS = -v leading_underscore=1
+# we do our own thing
+SHLIB_INSTALL =
LGCC_FILES = libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)
-INSTALL_FILES=$(LGCC_FILES)
+ifeq ($(BUILD_LIBGCCS1),YES)
-# we do our own thing
-SHLIB_INSTALL =
+# We are going to build a libgcc_s.1.dylib so that distributions can
+# install it for compatibility with binaries linked against the old
+# libgcc_ext.10.x.dylib stubs.
+
+# For systems after macOS 10.7 we can forward the correct unwinder symbols
+# from libSystem.
+
+# For older systems we have to forward an entire library (since they cannot
+# selectively forward symbols, which means that we cannot forward the unwinder
+# in /usr/lib/libgcc_s.1.dylib). We also cannot forward the entire library
+# since that creates a self-referencing loop when DYLD_LIBRARY_PATH is used.
+# To provide the unwinder symbols in this case, we build the unwinder into a
+# separate shared lib (libgcc_ehs) and forward that.
+
+# These targets are local to this make fragment, which means that they do not
+# get the substitutions seen in SHLIB_LINK.
+
+ifneq ($(LIBEHSOBJS),)
+
+EHS_INSTNAME = libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)
+
+# multilib build for a shared EH lib.
+$(LIBEHSOBJS): libgcc_tm.h
+
+libgcc_ehs$(SHLIB_EXT): $(LIBEHSOBJS)
+ mkdir -p $(MULTIDIR)
+ $(CC) $(LIBGCC2_CFLAGS) $(LDFLAGS) -dynamiclib -nodefaultlibs \
+ -install_name $(SHLIB_INSTALL_DIR)/$(EHS_INSTNAME) \
+ -o $(MULTIDIR)/libgcc_ehs$(SHLIB_EXT) $(SHLIB_VERSTRING) \
+ $(LIBEHSOBJS) $(SHLIB_LC)
+
+all: libgcc_ehs$(SHLIB_EXT)
+
+LGCC_FILES += libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)
+
+endif
+
+# Provide libgcc_s.1 for backwards compatibility.
+LGCC_FILES += libgcc_s.1.dylib
+
+endif
+
+INSTALL_FILES=$(LGCC_FILES)
-# For the toplevel multilib, build a fat archive including all the multilibs.
+# For the toplevel multilib, build FAT dylibs including all the multilibs.
ifeq ($(MULTIBUILDTOP),)
ifeq ($(enable_shared),yes)
@@ -52,7 +99,62 @@ libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT): all-multi libgcc_s$(SHLIB_EXT)
-create libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
-# Install the shared library.
+ifeq ($(BUILD_LIBGCCS1),YES)
+ifneq ($(LIBEHSOBJS),)
+
+libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT): all-multi libgcc_ehs$(SHLIB_EXT)
+ MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
+ for mlib in $$MLIBS ; do \
+ cp ../$${mlib}/libgcc/$${mlib}/libgcc_ehs$(SHLIB_EXT) \
+ ./libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
+ done
+ $(LIPO) -output libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT) \
+ -create libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
+ rm libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
+
+
+libgcc_s.1.dylib: libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT) libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)
+ MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
+ for mlib in $$MLIBS ; do \
+ cp ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT) \
+ ./libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
+ cp ../$${mlib}/libgcc/$${mlib}/libgcc_ehs$(SHLIB_EXT) \
+ ./libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
+ arch=`$(LIPO) -info libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} | sed -e 's/.*:\ //'` ; \
+ $(CC) -arch $${arch} -nodefaultlibs -dynamiclib \
+ -o libgcc_s.1$(SHLIB_EXT)_T_$${mlib} \
+ -Wl,-reexport_library,libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} \
+ -Wl,-reexport_library,libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} \
+ -install_name $(SHLIB_INSTALL_DIR)/libgcc_s.1.dylib \
+ -compatibility_version 1 -current_version 1 ; \
+ done
+ $(LIPO) -output libgcc_s.1$(SHLIB_EXT) -create libgcc_s.1$(SHLIB_EXT)_T*
+ rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
+ rm libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
+
+else
+
+libgcc_s.1.dylib: libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)
+ MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
+ for mlib in $$MLIBS ; do \
+ cp ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT) \
+ ./libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
+ arch=`$(LIPO) -info libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} | sed -e 's/.*:\ //'` ; \
+ $(CC) -arch $${arch} -nodefaultlibs -dynamiclib \
+ -o libgcc_s.1$(SHLIB_EXT)_T_$${mlib} \
+ -Wl,-reexport_library,libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} \
+ -lSystem \
+ -Wl,-reexported_symbols_list,$(srcdir)/config/darwin-unwind.ver \
+ -install_name $(SHLIB_INSTALL_DIR)/libgcc_s.1.dylib \
+ -compatibility_version 1 -current_version 1 ; \
+ done
+ $(LIPO) -output libgcc_s.1$(SHLIB_EXT) -create libgcc_s.1$(SHLIB_EXT)_T*
+ rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
+
+endif
+endif
+
+# Install the shared libraries.
install-darwin-libgcc-stubs :
$(mkinstalldirs) $(DESTDIR)$(slibdir)
@@ -62,10 +164,10 @@ install-darwin-libgcc-stubs :
else
-# Do not install shared libraries for any other multilibs. Unless we are
-# putting them in the gcc directory during a build, for compatibility with
-# the pre-top-level layout. In that case we provide symlinks to the FAT lib
-# from the sub-directories.
+# Do not install shared libraries for multilibs. Unless we are putting them
+# in the gcc directory during a build, for compatibility with the pre-top-
+# level layout. In that case we provide symlinks to the FAT lib from the
+# multilib sub-directories.
ifeq ($(enable_shared),yes)
all: install-darwin-libgcc-links