Fix libtool to provide a simple way to generate only "shared" object files or libraries.

- Support for "-shared" option is taken from libtool-2.0 that is already at lease 15 years old.
- Change PHP build system to use "-shared" instead of "--tag=disable-static".

Author: dstogov

build/Makefile.global

@@ -16,7 +16,7 @@ build-modules: $(PHP_MODULES) $(PHP_ZEND_EX)
 build-binaries: $(PHP_BINARIES)
 
 libphp.la: $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS)
-	$(LIBTOOL) --mode=link --tag=disable-static $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -rpath $(phptempdir) $(EXTRA_LDFLAGS) $(LDFLAGS) $(PHP_RPATHS) $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS) $(EXTRA_LIBS) $(ZEND_EXTRA_LIBS) -o $@
+	$(LIBTOOL) --mode=link $(CC) -shared $(CFLAGS) $(EXTRA_CFLAGS) -rpath $(phptempdir) $(EXTRA_LDFLAGS) $(LDFLAGS) $(PHP_RPATHS) $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS) $(EXTRA_LIBS) $(ZEND_EXTRA_LIBS) -o $@
 	-@$(LIBTOOL) --silent --mode=install cp $@ $(phptempdir)/$@ >/dev/null 2>&1
 
 libs/libphp.bundle: $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS)

build/ltmain.sh

@@ -811,6 +811,13 @@ if test -z "$show_help"; then
 
     for arg in $later; do
       case $arg in
+      -shared)
+	test yes = "$build_libtool_libs" \
+	  || func_fatal_configuration "cannot build a shared library"
+	build_old_libs=no
+	continue
+	;;
+
       -static)
 	build_old_libs=yes
 	continue
@@ -1177,6 +1184,12 @@ EOF
     for arg
     do
       case $arg in
+      -shared)
+	test yes != "$build_libtool_libs" \
+	  && func_fatal_configuration "cannot build a shared library"
+	build_old_libs=no
+	break
+	;;
       -all-static | -static | -static-libtool-libs)
 	case $arg in
 	-all-static)

build/php.m4

@@ -851,7 +851,7 @@ AC_DEFUN([PHP_SHARED_MODULE],[
 	\$(LIBTOOL) --mode=install cp $3/$1.$suffix \$(phplibdir)
 
 $3/$1.$suffix: \$($2) \$(translit($1,a-z_-,A-Z__)_SHARED_DEPENDENCIES)
-	\$(LIBTOOL) --mode=link --tag=disable-static ifelse($4,,[\$(CC)],[\$(CXX)]) \$(COMMON_FLAGS) \$(CFLAGS_CLEAN) \$(EXTRA_CFLAGS) \$(LDFLAGS) $additional_flags -o [\$]@ -export-dynamic -avoid-version -prefer-pic -module -rpath \$(phplibdir) \$(EXTRA_LDFLAGS) \$($2) \$(translit($1,a-z_-,A-Z__)_SHARED_LIBADD)
+	\$(LIBTOOL) --mode=link ifelse($4,,[\$(CC)],[\$(CXX)]) -shared \$(COMMON_FLAGS) \$(CFLAGS_CLEAN) \$(EXTRA_CFLAGS) \$(LDFLAGS) $additional_flags -o [\$]@ -export-dynamic -avoid-version -prefer-pic -module -rpath \$(phplibdir) \$(EXTRA_LDFLAGS) \$($2) \$(translit($1,a-z_-,A-Z__)_SHARED_LIBADD)
 
 EOF
 ])