Add support for linking talloc library statically or dynamically into samba.

This also establishes a general configure mechanism to control static vs
dynamic linking of internal subsystems built as libraries:
This first simple approach is as follows.

* It applies only to "subsystems" that we build as libraries and for
  that linking samba against the libraries (as opposed to linking in
  the plain object files) has been configured in Makefile.in.

* If we do build the shared library, then we link dynamically by default.

* We only link statically if we don't build shared or if the library
  appears in the new --with-static-libs configure option
  (comma-separated list).

Example (currently only one):
  --with-static-libs=talloc makes use of libtalloc.a instead
  of linking the dynamic variant with -ltalloc.

A possilble way to setup linking against libraries in Makefile.in is this:
For a subsystem, "mylib" say, we build bin/libmylib.a and bin/libmylib.so.
The subsystem usually has a MYLIB_OBJ definition in Makefile.in.  Define
LIBMYLIB_STATIC=bin/libmylib.a and and LIBMYLIB_LIBS=-lmylib in configure.in
as controlled by presence of "mylib" in the list given to --with-static-libs
and change uses of $(MYLIB_OBJ) to @LIBMYLIB_STATIC@ in Makefile.in and
add @LIBMYLIB_LIBS@ to the link targets as needed.

In the example of talloc, which is needed everywhere, I have simply
added @LIBTALLOC_LIBS@ to the definition of "LIBS" in Makefile.in.
For other subsystems, one will have to be more careful.

Michael
(This used to be commit 71b990d9d687b517dec3d4eff67b6a3fe417a12a)

1 files changed, 42 insertions, 0 deletions

diff --git a/source3/configure.in b/source3/configure.in
index 8d8fcab03d..eab8645b37 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -336,6 +336,8 @@ AC_SUBST(INSTALL_LIBTALLOC)
 AC_SUBST(UNINSTALL_LIBTALLOC)
 AC_SUBST(LIBTALLOC_SHARED)
 AC_SUBST(LIBTALLOC)
+AC_SUBST(LIBTALLOC_STATIC)
+AC_SUBST(LIBTALLOC_LIBS)
 
 AC_SUBST(INSTALL_LIBWBCLIENT)
 AC_SUBST(UNINSTALL_LIBWBCLIENT)
@@ -5127,11 +5129,45 @@ if test $enable_static = yes; then
 fi
 
 #################################################
+# --with-static-libs=LIBS:
+#   link (internal) libs dynamically or statically?
+#
+# If a subsystem is built as a library then this controls whether they are
+# linked into Samba targets statically or dynamically:
+#
+# * If we build the shared library at all, we link dynamically by default.
+#
+# * We only link statically if we don't build shared or if the library
+#   appears in the --with-static-libs configure option.
+#
+# Example:
+#   --with-static-libs=talloc makes use of libtalloc.a instead
+#   of linking the dynamic variant with -ltalloc.
+#
+# NOTE: This option only affects libraries that we do not only build
+# but that samba also links against as libraries (as opposed to linking
+# the plain object files. - This has to be configured in Makefile.in.
+# So in particular it does not harm to give invalid or unknown names here.
+#
+
+AC_ARG_WITH([static-libs],
+	[AC_HELP_STRING([--with-static-libs=LIBS],
+		[Comma-separated list of names of (internal) libraries to link statically (instead of dynamically)])],
+	[AS_IF([test $withval],
+		[for lib in `echo $withval | sed -e 's/,/ /g'` ; do
+			[lib=`echo $lib | tr '[a-z]' '[A-Z]'`]
+			eval LIB_$lib=STATIC
+		done], [])],
+	[])
+
+#################################################
 # should we build libtalloc?
 INSTALL_LIBTALLOC=
 UNINSTALL_LIBTALLOC=
 LIBTALLOC_SHARED=
 LIBTALLOC=
+LIBTALLOC_STATIC=
+LIBTALLOC_LIBS=
 
 AC_MSG_CHECKING(whether to build the libtalloc shared library)
 AC_ARG_WITH(libtalloc,
@@ -5157,12 +5193,18 @@ if test x"$samba_cv_with_libtalloc" = "xyes" -a $BLDSHARED = true; then
 	LIBTALLOC_SHARED=bin/libtalloc.$SHLIBEXT
 	LIBTALLOC=libtalloc
 	AC_MSG_RESULT(yes)
+	if test x"$LIB_TALLOC" = "xSTATIC" ; then
+		LIBTALLOC_STATIC=bin/libtalloc.a
+	else
+		LIBTALLOC_LIBS=-ltalloc
+	fi
 else
 	enable_static=yes
 	AC_MSG_RESULT(no shared library support -- will supply static library)
 fi
 if test $enable_static = yes; then
 	LIBTALLOC=libtalloc
+	LIBTALLOC_STATIC=bin/libtalloc.a
 fi
 INSTALL_LIBTALLOC=installlibtalloc
 UNINSTALL_LIBTALLOC=uninstalllibtalloc