1# Build a shared libgcc library with the darwin linker.
2
3SHLIB_SOVERSION = 1.1
4SHLIB_SO_MINVERSION = 1
5SHLIB_VERSTRING = -compatibility_version $(SHLIB_SO_MINVERSION) \
6                      -current_version $(SHLIB_SOVERSION)
7SHLIB_EXT = .dylib
8SHLIB_LC = -lSystem
9SHLIB_INSTALL_DIR = $(slibdir)
10
11SHLIB_MKMAP = $(srcdir)/mkmap-flat.awk
12SHLIB_MKMAP_OPTS = -v leading_underscore=1
13
14# Shorthand expressions for the LINK below, these are substituted in the
15# link expression.
16SHLIB_INSTALL_NAME = @shlib_base_name@.$(SHLIB_SOVERSION)$(SHLIB_EXT)
17SHLIB_MAP = @shlib_map_file@
18SHLIB_DIR = @multilib_dir@
19SHLIB_SONAME = @shlib_base_name@$(SHLIB_EXT)
20
21# Darwin only searches in shlib_slibdir for shared libraries, not in
22# subdirectories.  The link builds one architecture slice in its designated
23# subdir.  The code under MULTIBUILDTOP combines these into a single FAT
24# library, that is what we eventually install.
25
26SHLIB_LINK = $(CC) $(LIBGCC2_CFLAGS) $(LDFLAGS) -dynamiclib -nodefaultlibs \
27          -install_name $(SHLIB_INSTALL_DIR)/$(SHLIB_INSTALL_NAME) \
28          -single_module -o $(SHLIB_DIR)/$(SHLIB_SONAME) \
29          -Wl,-exported_symbols_list,$(SHLIB_MAP) \
30          $(SHLIB_VERSTRING) \
31          @multilib_flags@ @shlib_objs@ $(SHLIB_LC)
32
33# we do our own thing
34SHLIB_INSTALL =
35
36LGCC_FILES = libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)
37
38ifeq ($(BUILD_LIBGCCS1),YES)
39
40# We are going to build a libgcc_s.1.dylib so that distributions can
41# install it for compatibility with binaries linked against the old
42# libgcc_ext.10.x.dylib stubs.
43
44# For systems after macOS 10.7 we can forward the correct unwinder symbols
45# from libSystem.
46
47# For older systems we have to forward an entire library (since they cannot
48# selectively forward symbols, which means that we cannot forward the unwinder
49# in /usr/lib/libgcc_s.1.dylib).  We also cannot forward the entire library
50# since that creates a self-referencing loop when DYLD_LIBRARY_PATH is used.
51# To provide the unwinder symbols in this case, we build the unwinder into a
52# separate shared lib (libgcc_ehs) and forward that.
53
54# These targets are local to this make fragment, which means that they do not
55# get the substitutions seen in SHLIB_LINK.
56
57ifneq ($(LIBEHSOBJS),)
58
59EHS_INSTNAME = libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)
60
61# multilib build for a shared EH lib.
62
63libgcc_ehs$(SHLIB_EXT): $(LIBEHSOBJS) $(extra-parts)
64          mkdir -p $(MULTIDIR)
65          $(CC) $(LIBGCC2_CFLAGS) $(LDFLAGS) -dynamiclib -nodefaultlibs \
66          -install_name $(SHLIB_INSTALL_DIR)/$(EHS_INSTNAME) \
67          -o $(MULTIDIR)/libgcc_ehs$(SHLIB_EXT) $(SHLIB_VERSTRING) \
68          $(LIBEHSOBJS) $(SHLIB_LC)
69
70all: libgcc_ehs$(SHLIB_EXT)
71
72LGCC_FILES += libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)
73
74endif
75endif
76
77INSTALL_FILES=$(LGCC_FILES)
78
79ifeq ($(BUILD_LIBGCCS1),YES)
80# Provide libgcc_s.1 for backwards compatibility.
81INSTALL_FILES += libgcc_s.1.dylib
82endif
83
84# For the toplevel multilib, build FAT dylibs including all the multilibs.
85ifeq ($(MULTIBUILDTOP),)
86
87ifeq ($(enable_shared),yes)
88all: $(INSTALL_FILES)
89install-leaf: install-darwin-libgcc-stubs
90endif
91
92libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT): all-multi libgcc_s$(SHLIB_EXT)
93          MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
94          for mlib in $$MLIBS ; do \
95            cp ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT)  \
96              ./libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
97          done
98          $(LIPO) -output libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT) \
99            -create libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
100          rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
101
102ifeq ($(BUILD_LIBGCCS1),YES)
103ifneq ($(LIBEHSOBJS),)
104
105libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT): all-multi libgcc_ehs$(SHLIB_EXT)
106          MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
107          for mlib in $$MLIBS ; do \
108            cp ../$${mlib}/libgcc/$${mlib}/libgcc_ehs$(SHLIB_EXT)  \
109              ./libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
110          done
111          $(LIPO) -output libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT) \
112            -create libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
113          rm libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
114
115
116libgcc_s.1.dylib: all-multi libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT) \
117                      libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)
118          MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
119          for mlib in $$MLIBS ; do \
120            cp ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT)  \
121              ./libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
122            cp ../$${mlib}/libgcc/$${mlib}/libgcc_ehs$(SHLIB_EXT)  \
123              ./libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
124            arch=`$(LIPO) -info libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} | sed -e 's/.*:\ //'` ; \
125            $(CC) -arch $${arch} -nodefaultlibs -dynamiclib \
126              -o libgcc_s.1$(SHLIB_EXT)_T_$${mlib} \
127              -Wl,-reexport_library,libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} \
128              -Wl,-reexport_library,libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} \
129              -install_name $(SHLIB_INSTALL_DIR)/libgcc_s.1.dylib \
130              -compatibility_version 1 -current_version 1 ; \
131          done
132          $(LIPO) -output libgcc_s.1$(SHLIB_EXT) -create libgcc_s.1$(SHLIB_EXT)_T*
133          rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
134          rm libgcc_ehs.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
135
136else
137
138libgcc_s.1.dylib: all-multi libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)
139          MLIBS=`$(CC) --print-multi-lib | sed -e 's/;.*$$//'` ; \
140          for mlib in $$MLIBS ; do \
141            cp ../$${mlib}/libgcc/$${mlib}/libgcc_s$(SHLIB_EXT)  \
142              ./libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} || exit 1 ; \
143            arch=`$(LIPO) -info libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} | sed -e 's/.*:\ //'` ; \
144            $(CC) -arch $${arch} -nodefaultlibs -dynamiclib \
145              -o libgcc_s.1$(SHLIB_EXT)_T_$${mlib} \
146              -Wl,-reexport_library,libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T_$${mlib} \
147              -lSystem \
148              -Wl,-reexported_symbols_list,$(srcdir)/config/darwin-unwind.ver \
149              -install_name $(SHLIB_INSTALL_DIR)/libgcc_s.1.dylib \
150              -compatibility_version 1 -current_version 1 ; \
151          done
152          $(LIPO) -output libgcc_s.1$(SHLIB_EXT) -create libgcc_s.1$(SHLIB_EXT)_T*
153          rm libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)_T*
154
155endif
156endif
157
158# Install the shared libraries.
159
160install-darwin-libgcc-stubs :
161          $(mkinstalldirs) $(DESTDIR)$(slibdir)
162          if test x$(slibdir) = x; then \
163            for d in $(LGCC_FILES) ; do \
164              $(INSTALL_DATA) $$d $(DESTDIR)$(slibdir)/$$d || exit 1 ; \
165            done; \
166          else \
167            for d in $(INSTALL_FILES) ; do \
168              $(INSTALL_DATA) $$d $(DESTDIR)$(slibdir)/$$d || exit 1 ; \
169            done; \
170          fi
171
172else
173
174# Do not install shared libraries for multilibs.  Unless we are putting them
175# in the gcc directory during a build, for compatibility with the pre-top-
176# level layout.  In that case we provide symlinks to the FAT lib from the
177# multilib sub-directories.
178
179ifeq ($(enable_shared),yes)
180all: install-darwin-libgcc-links
181endif
182
183install-darwin-libgcc-links:
184          $(mkinstalldirs) $(gcc_objdir)$(MULTISUBDIR)
185          for file in $(INSTALL_FILES); do                            \
186            rm -f $(gcc_objdir)$(MULTISUBDIR)/$$file;                 \
187            $(LN_S) ../$$file $(gcc_objdir)$(MULTISUBDIR)/; \
188          done
189
190endif
191