d: Add darwin support for D language front-end

gcc/ChangeLog:

	* config.gcc (*-*-darwin*): Set d_target_objs and target_has_targetdm.
	* config/elfos.h (TARGET_D_MINFO_SECTION): New macro.
	(TARGET_D_MINFO_START_NAME): New macro.
	(TARGET_D_MINFO_END_NAME): New macro.
	* config/t-darwin: Add darwin-d.o.
	* doc/tm.texi: Regenerate.
	* doc/tm.texi.in (D language and ABI): Add @hook for
	TARGET_D_MINFO_SECTION, TARGET_D_MINFO_START_NAME, and
	TARGET_D_MINFO_END_NAME.
	* config/darwin-d.c: New file.

gcc/d/ChangeLog:

	* d-target.def (d_minfo_section): New hook.
	(d_minfo_start_name): New hook.
	(d_minfo_end_name): New hook.
	* modules.cc: Include d-target.h.
	(register_moduleinfo): Update to use new targetdm hooks.

2 files changed, 36 insertions, 3 deletions

diff --git a/gcc/d/d-target.def b/gcc/d/d-target.def
index 41b3172..728cba7 100644
--- a/gcc/d/d-target.def
+++ b/gcc/d/d-target.def
@@ -46,5 +46,30 @@ relating to the target operating system.",
  void, (void),
  hook_void_void)
 
+/* ModuleInfo section name and brackets.  */
+DEFHOOKPOD
+(d_minfo_section,
+ "Contains the name of the section in which module info references should be\n\
+placed.  This section is expected to be bracketed by two symbols to indicate\n\
+the start and end address of the section, so that the runtime library can\n\
+collect all modules for each loaded shared library and executable.  The\n\
+default value of @code{NULL} disables the use of sections altogether.",
+ const char *, NULL)
+
+DEFHOOKPOD
+(d_minfo_start_name,
+ "If @code{TARGET_D_MINFO_SECTION} is defined, then this must also be defined\n\
+as the name of the symbol indicating the start address of the module info\n\
+section",
+ const char *, NULL)
+
+/* The name of the ModuleInfo section.  */
+DEFHOOKPOD
+(d_minfo_end_name,
+ "If @code{TARGET_D_MINFO_SECTION} is defined, then this must also be defined\n\
+as the name of the symbol indicating the end address of the module info\n\
+section",
+ const char *, NULL)
+
 /* Close the 'struct gcc_targetdm' definition.  */
 HOOK_VECTOR_END (C90_EMPTY_HACK)
diff --git a/gcc/d/modules.cc b/gcc/d/modules.cc
index 4b48c19..742a24f 100644
--- a/gcc/d/modules.cc
+++ b/gcc/d/modules.cc
@@ -36,6 +36,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "stringpool.h"
 
 #include "d-tree.h"
+#include "d-target.h"
 
 
 /* D generates module information to inform the runtime library which modules
@@ -405,6 +406,10 @@ build_dso_registry_var (const char * name, tree type)
 static void
 register_moduleinfo (Module *decl, tree minfo)
 {
+  /* No defined minfo section for target.  */
+  if (targetdm.d_minfo_section == NULL)
+    return;
+
   if (!targetm_common.have_named_sections)
     sorry ("%<-fmoduleinfo%> is not supported on this target");
 
@@ -420,7 +425,8 @@ register_moduleinfo (Module *decl, tree minfo)
   DECL_EXTERNAL (mref) = 0;
   DECL_PRESERVE_P (mref) = 1;
 
-  set_decl_section_name (mref, "minfo");
+  set_decl_section_name (mref, targetdm.d_minfo_section);
+  symtab_node::get (mref)->implicit_section = true;
   d_pushdecl (mref);
   rest_of_decl_compilation (mref, 1, 0);
 
@@ -431,10 +437,12 @@ register_moduleinfo (Module *decl, tree minfo)
   if (!first_module)
     return;
 
-  start_minfo_node = build_dso_registry_var ("__start_minfo", ptr_type_node);
+  start_minfo_node = build_dso_registry_var (targetdm.d_minfo_start_name,
+					     ptr_type_node);
   rest_of_decl_compilation (start_minfo_node, 1, 0);
 
-  stop_minfo_node = build_dso_registry_var ("__stop_minfo", ptr_type_node);
+  stop_minfo_node = build_dso_registry_var (targetdm.d_minfo_end_name,
+					    ptr_type_node);
   rest_of_decl_compilation (stop_minfo_node, 1, 0);
 
   /* Declare dso_slot and dso_initialized.  */