re PR c++/47950 ([C++0x] Internal compiler error: non-dependent declaration as condit...

	PR c++/47950
	* parser.c (cp_parser_condition): Don't fold_non_dependent_expr here.

From-SVN: r170639

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index b9ad026d3c2224f26d5726e01f3c25e84f82b9eb..264bc7c7ed9ff0c0b2bf62e04cf97888f9e52b15 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,8 @@
 2011-03-02  Jason Merrill  <jason@redhat.com>
 
+       PR c++/47950
+       * parser.c (cp_parser_condition): Don't fold_non_dependent_expr here.
+
        PR c++/47774
        * tree.c (build_vec_init_elt): Split out from...
        (build_vec_init_expr): ...here.

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index c63d5b3a0498f536c6dfb9a6fb509d902d46a07f..510fcb1117995776d5101a59be37faa6a9e4072c 100644 (file)
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -8687,9 +8687,6 @@ cp_parser_condition (cp_parser* parser)
          if (BRACE_ENCLOSED_INITIALIZER_P (initializer))
            maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
 
-         if (!non_constant_p)
-           initializer = fold_non_dependent_expr (initializer);
-
          /* Process the initializer.  */
          cp_finish_decl (decl,
                          initializer, !non_constant_p,

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 328ed9e468eca148975a4c6b48acc09492e22bf3..7b139222f3a0558f38572c3c414b703cd59d7e6c 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,7 @@
 2011-03-02  Jason Merrill  <jason@redhat.com>
 
+       * g++.dg/cpp0x/regress/condition1.C: New.
+
        * g++.dg/cpp0x/constexpr-ctor9.C: New.
 
 2011-03-01  Jason Merrill  <jason@redhat.com>

diff --git a/gcc/testsuite/g++.dg/cpp0x/regress/condition1.C b/gcc/testsuite/g++.dg/cpp0x/regress/condition1.C
new file mode 100644 (file)
index 0000000..0346764
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/regress/condition1.C
@@ -0,0 +1,80 @@
+// PR c++/47950
+// { dg-options -std=c++0x }
+
+template <typename T> struct empty
+{
+   // allow success case to build (not relevant to bug)
+   operator bool() { return true; }
+};
+
+template <typename T> struct from_int
+{
+   from_int(int) {}
+
+   // allow success case to build (not relevant to bug)
+   operator bool() { return true; }
+};
+
+template <typename T>
+from_int<T> via_function(T v)
+{
+   return from_int<T>(v);
+}
+
+template <typename T>
+void f()
+{
+   // ********* this section compiles ***********
+
+   // these plain initializers work fine
+   from_int<int> a = 7;
+   from_int<int> b = from_int<int>(7);
+   empty<int>    c = empty<int>();
+   from_int<T> ta = 7;
+   from_int<T> tb = from_int<T>(7);
+   empty<T>    tc = empty<T>();
+
+   // these dependent condition decls work fine
+   if (empty<T> x = empty<T>())
+      ;
+   if (from_int<T> x = 7)
+      ;
+   if (from_int<T> x = from_int<T>(7))
+      ;
+   if (from_int<T> x = via_function(T()))
+      ;
+
+   // this non-dependent condition decl using conversion works fine
+   if (from_int<int> x = 7)
+      ;
+
+   // these non-dependent condition decls using conversion or braced-
+   // initialization work fine (in c++0x mode only course)
+   #if __GXX_EXPERIMENTAL_CXX0X__
+   if (empty<int> x {})
+      ;
+   if (from_int<int> x {7})
+      ;
+   #endif
+
+   // ********** this section fails in C++0x ***********
+
+   // the following non-dependent condition decls cause an assertion
+   // failure in
+   //
+   //   tsubst_copy_and_build, at cp/pt.c:13370
+   //
+   // in C++0x mode
+   //
+   if (empty<int> x = empty<int>())
+      ;
+   if (from_int<int> x = from_int<int>(7))
+      ;
+   if (from_int<int> x = via_function(7))
+      ;
+}
+
+int main()
+{
+   f<int>();
+}