* collect2.c (COLLECT_SHARED_INIT_FUNC)

(COLLECT_SHARD_FINI_FUNC): Define default values.
(write_c_file_stat): Use them to call construtor and destructor
functions in shared libraries.
* doc/tm.texi (COLLECT_SHARED_INIT_FUNC)
(COLLECT_SHARD_FINI_FUNC): Document them.
* config/netbsd.h (COLLECT_SHARED_INIT_FUNC)
(COLLECT_SHARD_FINI_FUNC): Define.

* config/netbsd.h (LINK_SPEC): Don't pull in estart if creating a
shared library.  Pass -shared through to the linker.
* config/arm/netbsd.h (LINK_SPEC): Likewise.

* config/arm/t-netbsd (TARGET_LIBGCC2_CFLAGS): Add -fpic.
(SHLIB_EXT, SHLIB_NAME, SHLIB_SONAME, SHLIB_OBJS, SHLIB_LINK)
(SHLIB_INSTALL): Define.

From-SVN: r47975

3 files changed, 37 insertions, 5 deletions

diff --git a/gcc/config/arm/netbsd.h b/gcc/config/arm/netbsd.h
index 9684fdb..74f32e8 100644
--- a/gcc/config/arm/netbsd.h
+++ b/gcc/config/arm/netbsd.h
@@ -67,8 +67,8 @@ Boston, MA 02111-1307, USA.  */
 /* Pass -X to the linker so that it will strip symbols starting with 'L' */
 #undef LINK_SPEC
 #define LINK_SPEC "\
--X %{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} \
-%{static:-Bstatic} %{assert*} \
+-X %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} \
+%{static:-Bstatic}} %{shared} %{assert*} \
 "
 
 #undef SIZE_TYPE
diff --git a/gcc/config/arm/t-netbsd b/gcc/config/arm/t-netbsd
index 6c59cc9..511b015 100644
--- a/gcc/config/arm/t-netbsd
+++ b/gcc/config/arm/t-netbsd
@@ -1,8 +1,25 @@
 # Just for these, we omit the frame pointer since it makes such a big
 # difference.  It is then pointless adding debugging.
-TARGET_LIBGCC2_CFLAGS = -fomit-frame-pointer
+TARGET_LIBGCC2_CFLAGS = -fomit-frame-pointer -fpic
 LIBGCC2_DEBUG_CFLAGS = -g0
 
+# Build a shared libgcc library.
+SHLIB_EXT = .so
+SHLIB_NAME = @shlib_base_name@.so
+SHLIB_SONAME = @shlib_base_name@.so.1
+SHLIB_OBJS = @shlib_objs@
+
+SHLIB_LINK = $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -shared -nodefaultlibs \
+	-Wl,-soname,$(SHLIB_SONAME) \
+	-o $(SHLIB_NAME) @multilib_flags@ $(SHLIB_OBJS) -lc && \
+	rm -f $(SHLIB_SONAME) && \
+	$(LN_S) $(SHLIB_NAME) $(SHLIB_SONAME)
+# $(slibdir) double quoted to protect it from expansion while building
+# libgcc.mk.  We want this delayed until actual install time.
+SHLIB_INSTALL = $(INSTALL_DATA) $(SHLIB_NAME) $$(slibdir)/$(SHLIB_SONAME); \
+	rm -f $$(slibdir)/$(SHLIB_NAME); \
+	$(LN_S) $(SHLIB_SONAME) $$(slibdir)/$(SHLIB_NAME)
+
 # Don't build enquire
 ENQUIRE=
 
diff --git a/gcc/config/netbsd.h b/gcc/config/netbsd.h
index b76e747..35e671b 100644
--- a/gcc/config/netbsd.h
+++ b/gcc/config/netbsd.h
@@ -54,11 +54,26 @@
 #define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}"
 
 /* Provide a LINK_SPEC appropriate for NetBSD.  Here we provide support
-   for the special GCC options -static, -assert, and -nostdlib.  */
+   for the special GCC options -shared, -static, -assert, and -nostdlib.  */
 
 #undef LINK_SPEC
 #define LINK_SPEC \
-  "%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} %{static:-Bstatic} %{assert*}"
+  "%{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} %{static:-Bstatic}} %{shared} %{assert*}"
+
+/* When building shared libraries, the initialization and finalization 
+   functions for the library are .init and .fini respectively.  */
+
+#define COLLECT_SHARED_INIT_FUNC(STREAM,FUNC)				\
+  do {									\
+    fprintf ((STREAM), "void __init() __asm__ (\".init\");");		\
+    fprintf ((STREAM), "void __init() {\n\t%s();\n}\n", (FUNC));	\
+  } while (0);
+
+#define COLLECT_SHARED_FINI_FUNC(STREAM,FUNC)				\
+  do {									\
+    fprintf ((STREAM), "void __fini() __asm__ (\".fini\");");		\
+    fprintf ((STREAM), "void __fini() {\n\t%s();\n}\n", (FUNC));	\
+  } while (0);
 
 /* This defines which switch letters take arguments. */
 #undef SWITCH_TAKES_ARG