re PR c++/30500 (pragma GCC system_header vs templates)

2007-03-26  Paolo Carlini  <pcarlini@suse.de>

	PR c++/30500
	* pt.c (instantiate_decl): Set in_system_header.

2007-03-26  Paolo Carlini  <pcarlini@suse.de>

	PR c++/30500
	* g++.dg/warn/pragma-system_header1.C: New test.
	* g++.dg/warn/pragma-system_header2.C: New test.
	* g++.dg/warn/pragma-system_header1.h. New.
	* g++.dg/warn/pragma-system_header2.h. New.

From-SVN: r123238

gcc/cp/ChangeLog

+2007-03-26  Paolo Carlini  <pcarlini@suse.de>
+
+	PR c++/30500
+	* pt.c (instantiate_decl): Set in_system_header.
+
 2007-03-22  Mark Mitchell  <mark@codesourcery.com>
 
 	* cp-tree.h (current_tempalte_parms): Improve documentation.

gcc/cp/pt.c

@@ -13829,6 +13829,7 @@ instantiate_decl (tree d, int defer_ok,
   bool pattern_defined;
   int need_push;
   location_t saved_loc = input_location;
+  int saved_in_system_header = in_system_header;
   bool external_p;
 
   /* This function should only be used to instantiate templates for
@@ -13911,6 +13912,7 @@ instantiate_decl (tree d, int defer_ok,
     mark_definable (d);
 
   input_location = DECL_SOURCE_LOCATION (d);
+  in_system_header = DECL_IN_SYSTEM_HEADER (d);
 
   /* If D is a member of an explicitly instantiated class template,
      and no definition is available, treat it like an implicit
@@ -14178,6 +14180,7 @@ instantiate_decl (tree d, int defer_ok,
 
 out:
   input_location = saved_loc;
+  in_system_header = saved_in_system_header;
   pop_deferring_access_checks ();
   pop_tinst_level ();
 

gcc/testsuite/g++.dg/warn/pragma-system_header1.C

+// PR c++/30500
+// { dg-options "-Wconversion" }
+
+#include "pragma-system_header1.h"
+
+void f()
+{
+  g<int>();
+  h<int>();
+}

gcc/testsuite/g++.dg/warn/pragma-system_header1.h

+#pragma GCC system_header
+
+template <typename T>
+  int g() { double d = 0.1; return d; }
+   
+template <typename T>
+  T h() { double d = 0.1; return d; }

gcc/testsuite/g++.dg/warn/pragma-system_header2.C

+// PR c++/30500
+// { dg-options "-Wconversion" }
+
+#include "pragma-system_header2.h"
+
+void f()
+{
+  g<int>();
+  h<int>();
+}
+
+// { dg-warning "conversion" "" { target *-*-* } 2 }
+// { dg-warning "conversion" "" { target *-*-* } 5 }

gcc/testsuite/g++.dg/warn/pragma-system_header2.h

+template <typename T>
+  int g() { double d = 0.1; return d; }
+   
+template <typename T>
+  T h() { double d = 0.1; return d; }