From f59e8974081274bf2bd22fac43c4a1a5625f06e7 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Mon, 26 May 2025 19:13:21 +0000
Subject:  Support shlibs on MacOS

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 Makefile                 | 44 ++++++++++++++++++++++++++++++++++----------
 configure                | 21 +++++++++++++++------
 tools/configure.template | 21 +++++++++++++++------
 3 files changed, 64 insertions(+), 22 deletions(-)

diff --git a/Makefile b/Makefile
index 90098b5..a8af4b4 100644
--- a/Makefile
+++ b/Makefile
@@ -25,10 +25,13 @@ LIB_DEFS :=
 BIN_SYMLINKS :=
 TEST_BINS :=
 
+-include config.mak
+include package/targets.mak
+
 define library_definition
-LIB$(1) := lib$(2).$(if $(DO_ALLSTATIC),a,so).xyzzy
+LIB$(1) := lib$(2).$(if $(DO_ALLSTATIC),a,$(SHLIB_EXT)).xyzzy
 ifdef DO_SHARED
-SHARED_LIBS += lib$(2).so.xyzzy
+SHARED_LIBS += lib$(2).$(SHLIB_EXT).xyzzy
 endif
 ifdef DO_STATIC
 STATIC_LIBS += lib$(2).a.xyzzy
@@ -67,9 +70,6 @@ $(DESTDIR)$(1)/$(2): $(DESTDIR)$(1)/$(SYMLINK_TARGET_$(2))
 	exec $(INSTALL) -l $$(<F) $$@
 endef
 
--include config.mak
-include package/targets.mak
-
 $(foreach var,$(LIB_DEFS),$(eval $(call library_definition,$(firstword $(subst =, ,$(var))),$(lastword $(subst =, ,$(var))))))
 
 include package/deps.mak
@@ -124,7 +124,7 @@ ifneq ($(strip $(ALL_BINS)$(SHARED_LIBS)),)
 endif
 
 install: install-dynlib install-libexec install-bin install-symlinks install-lib install-include install-pkgconfig
-install-dynlib: $(SHARED_LIBS:lib%.so.xyzzy=$(DESTDIR)$(dynlibdir)/lib%.so)
+install-dynlib: $(SHARED_LIBS:lib%.$(SHLIB_EXT).xyzzy=$(DESTDIR)$(dynlibdir)/lib%.$(SHLIB_EXT))
 install-libexec: $(LIBEXEC_TARGETS:%=$(DESTDIR)$(libexecdir)/%)
 install-bin: $(BIN_TARGETS:%=$(DESTDIR)$(bindir)/%)
 install-symlinks: $(BIN_SYMLINKS:%=$(DESTDIR)$(bindir)/%)
@@ -156,10 +156,10 @@ $(DESTDIR)$(sproot)/library.so/lib%.so.$(version_M): $(DESTDIR)$(dynlibdir)/lib%
 
 endif
 
-$(DESTDIR)$(dynlibdir)/lib%.so $(DESTDIR)$(dynlibdir)/lib%.so.$(version_M): lib%.so.xyzzy
-	$(INSTALL) -D -m 755 $< $@.$(version) && \
-	$(INSTALL) -l $(@F).$(version) $@.$(version_M) && \
-	exec $(INSTALL) -l $(@F).$(version_M) $@
+$(DESTDIR)$(dynlibdir)/lib%.so $(DESTDIR)$(dynlibdir)/lib%.so.$(version_M) $(DESTDIR)$(dynlibdir)/lib%.so.$(version): lib%.so.xyzzy
+	$(INSTALL) -D -m 755 $< $(@D)/lib$(*F).so.$(version) && \
+	$(INSTALL) -l lib$(*F).so.$(version) $(@D)/lib$(*F).so.$(version_M) && \
+	exec $(INSTALL) -l lib$(*F).so.$(version_M) $(@D)/lib$(*F).so
 
 $(DESTDIR)$(libdir)/lib%.a: lib%.a.xyzzy
 	exec $(INSTALL) -D -m 644 $< $@
@@ -192,3 +192,27 @@ lib%.so.xyzzy:
 .PHONY: it all clean distclean tests check tgz strip install install-dynlib install-bin install-lib install-include install-pkgconfig
 
 .DELETE_ON_ERROR:
+
+ifeq ($(SHLIB_EXT),dylib)
+
+version_X := $(shell exec expr 256 '*' $(version_l) + $(subst .,,$(suffix $(version_M))))
+version_XY := $(version_X)$(suffix $(version_m))
+version_XYZ := $(version_XY)$(suffix $(version))
+
+ifneq ($(exthome),)
+global-links: $(SHARED_LIBS:lib%.dylib.xyzzy=$(DESTDIR)$(sproot)/library.so/lib%.$(version_X).dylib)
+
+$(DESTDIR)$(sproot)/library.so/lib%.$(version_X).dylib: $(DESTDIR)$(sproot)/library.so/lib%.$(version_M).dylib
+	exec $(INSTALL) -l $(<F) $@
+endif
+
+$(DESTDIR)$(dynlibdir)/lib%.dylib $(DESTDIR)$(dynlibdir)/lib%.$(version_X).dylib $(DESTDIR)$(dynlibdir)/lib%.$(version_M).dylib $(DESTDIR)$(dynlibdir)/lib%.$(version).dylib: lib%.dylib.xyzzy
+	$(INSTALL) -D -m 755 $< $(@D)/lib$(*F).$(version).dylib && \
+	$(INSTALL) -l lib$(*F).$(version).dylib $(@D)/lib$(*F).$(version_M).dylib && \
+	$(INSTALL) -l lib$(*F).$(version_M).dylib $(@D)/lib$(*F).$(version_X).dylib && \
+	exec $(INSTALL) -l lib$(*F).$(version_X).dylib $(@D)/lib$(*F).dylib
+
+lib%.dylib.xyzzy: $(ALL_DOBJS)
+	exec $(CC) -o $@ $(CFLAGS_ALL) $(CFLAGS_SHARED) $(LDFLAGS_ALL) $(LDFLAGS_SHARED) -Wl,-dylib_install_name,$(dynlibdir)/lib$(*F).$(version_M).dylib -Wl,-dylib_compatibility_version,$(version_XY) -Wl,-dylib_current_version,$(version_XYZ) -undefined dynamic_lookup $^ $(EXTRA_LIBS) $(SOCKET_LIB) $(SPAWN_LIB) $(SYSCLOCK_LIB) $(TAINNOW_LIB) $(TIMER_LIB) $(UTIL_LIB) $(LDLIBS)
+endif
+
diff --git a/configure b/configure
index 0eedbe9..8c12c5c 100755
--- a/configure
+++ b/configure
@@ -152,6 +152,7 @@ pkgconfdir='$prefix/lib/pkgconfig'
 shebangdir='$bindir'
 sysdeps='$prefix/lib/skalibs/sysdeps'
 manualsysdeps=false
+shlibext=so
 shared=false
 static=true
 allpic=true
@@ -201,9 +202,9 @@ for arg ; do
     --disable-shared|--enable-shared=no) shared=false ;;
     --enable-static|--enable-static=yes) static=true ;;
     --disable-static|--enable-static=no) static=false ;;
-    --enable-allstatic|--enable-allstatic=yes) allstatic=true ;;
-    --disable-allstatic|--enable-allstatic=no) allstatic=false ; evenmorestatic=false ;;
-    --enable-static-libc|--enable-static-libc=yes) allstatic=true ; evenmorestatic=true ;;
+    --enable-allstatic|--enable-allstatic=yes) static=true ; allstatic=true ;;
+    --disable-allstatic|--enable-allstatic=no) allstatic=false ; evenmorestatic=false ; shared=true ;;
+    --enable-static-libc|--enable-static-libc=yes) static=true ; allstatic=true ; evenmorestatic=true ;;
     --disable-static-libc|--enable-static-libc=no) evenmorestatic=false ;;
     --enable-all-pic|--enable-all-pic=yes) allpic=true ;;
     --disable-all-pic|--enable-all-pic=no) allpic=false ;;
@@ -388,11 +389,18 @@ if test ! -d $sysdeps || test ! -f $sysdeps/target ; then
   echo "$0: error: $sysdeps is not a valid sysdeps directory"
   exit 1
 fi
-if [ "x$target" != "x$(cat $sysdeps/target)" ] ; then
+if test "$target" != "$(cat $sysdeps/target)" ; then
   echo "$0: error: target $target does not match the contents of $sysdeps/target"
   exit 1
 fi
 
+echo "Shared libraries will be named ..."
+libc="${target##*-}"
+if test "${libc##darwin}" != "$libc" ; then
+  shlibext=dylib
+fi
+echo "  ... *.$shlibext"
+
 if $allpic ; then
   tryflag CPPFLAGS_AUTO -fPIC
 fi
@@ -509,16 +517,17 @@ LDFLAGS := ${LDFLAGS}${LDFLAGS_POST:+ }$LDFLAGS_POST
 LDFLAGS_SHARED := $LDFLAGS_SHARED
 LDFLAGS_NOSHARED :=$LDFLAGS_NOSHARED
 CROSS_COMPILE := $cross
+SHLIB_EXT := ${shlibext}
 
 vpath lib%.a$vpaths
-vpath lib%.so$vpathd
+vpath lib%.${shlibext}$vpathd
 
 EOF
 if $allstatic ; then
   echo ".LIBPATTERNS := lib%.a"
   echo "DO_ALLSTATIC := 1"
 else
-  echo ".LIBPATTERNS := lib%.so"
+  echo ".LIBPATTERNS := lib%.${shlibext}"
   echo "DO_ALLSTATIC :="
 fi
 if $static ; then
diff --git a/tools/configure.template b/tools/configure.template
index c0e2945..db8f59a 100755
--- a/tools/configure.template
+++ b/tools/configure.template
@@ -147,6 +147,7 @@ pkgconfdir='$prefix/lib/pkgconfig'
 shebangdir='$bindir'
 sysdeps='$prefix/lib/skalibs/sysdeps'
 manualsysdeps=false
+shlibext=so
 shared=false
 static=true
 allpic=true
@@ -192,9 +193,9 @@ for arg ; do
     --disable-shared|--enable-shared=no) shared=false ;;
     --enable-static|--enable-static=yes) static=true ;;
     --disable-static|--enable-static=no) static=false ;;
-    --enable-allstatic|--enable-allstatic=yes) allstatic=true ;;
-    --disable-allstatic|--enable-allstatic=no) allstatic=false ; evenmorestatic=false ;;
-    --enable-static-libc|--enable-static-libc=yes) allstatic=true ; evenmorestatic=true ;;
+    --enable-allstatic|--enable-allstatic=yes) static=true ; allstatic=true ;;
+    --disable-allstatic|--enable-allstatic=no) allstatic=false ; evenmorestatic=false ; shared=true ;;
+    --enable-static-libc|--enable-static-libc=yes) static=true ; allstatic=true ; evenmorestatic=true ;;
     --disable-static-libc|--enable-static-libc=no) evenmorestatic=false ;;
     --enable-all-pic|--enable-all-pic=yes) allpic=true ;;
     --disable-all-pic|--enable-all-pic=no) allpic=false ;;
@@ -373,11 +374,18 @@ if test ! -d $sysdeps || test ! -f $sysdeps/target ; then
   echo "$0: error: $sysdeps is not a valid sysdeps directory"
   exit 1
 fi
-if [ "x$target" != "x$(cat $sysdeps/target)" ] ; then
+if test "$target" != "$(cat $sysdeps/target)" ; then
   echo "$0: error: target $target does not match the contents of $sysdeps/target"
   exit 1
 fi
 
+echo "Shared libraries will be named ..."
+libc="${target##*-}"
+if test "${libc##darwin}" != "$libc" ; then
+  shlibext=dylib
+fi
+echo "  ... *.$shlibext"
+
 if $allpic ; then
   tryflag CPPFLAGS_AUTO -fPIC
 fi
@@ -467,16 +475,17 @@ LDFLAGS := ${LDFLAGS}${LDFLAGS_POST:+ }$LDFLAGS_POST
 LDFLAGS_SHARED := $LDFLAGS_SHARED
 LDFLAGS_NOSHARED :=$LDFLAGS_NOSHARED
 CROSS_COMPILE := $cross
+SHLIB_EXT := ${shlibext}
 
 vpath lib%.a$vpaths
-vpath lib%.so$vpathd
+vpath lib%.${shlibext}$vpathd
 
 EOF
 if $allstatic ; then
   echo ".LIBPATTERNS := lib%.a"
   echo "DO_ALLSTATIC := 1"
 else
-  echo ".LIBPATTERNS := lib%.so"
+  echo ".LIBPATTERNS := lib%.${shlibext}"
   echo "DO_ALLSTATIC :="
 fi
 if $static ; then
-- 
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