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re PR c++/28385 (templated function call goes awry)

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PR c++/28385
        * pt.c (tsubst) [TEMPLATE_TYPE_PARM]: Ignore quals from template
        if arg is a function.

From-SVN: r116203
This commit is contained in:
Jason Merrill 2006-08-16 20:51:37 -04:00 committed by Jason Merrill
parent 4cb55a5ae0
commit 9180c238de
3 changed files with 48 additions and 2 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2006-08-16 Jason Merrill <jason@redhat.com>
PR c++/28385
* pt.c (tsubst) [TEMPLATE_TYPE_PARM]: Ignore quals from template
if arg is a function.
2006-08-16 Volker Reichelt <reichelt@igpm.rwth-aachen.de>
PR c++/28593

14
gcc/cp/pt.c
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@ -7238,10 +7238,20 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
{
if (TREE_CODE (t) == TEMPLATE_TYPE_PARM)
{
int quals;
gcc_assert (TYPE_P (arg));
/* cv-quals from the template are discarded when
substituting in a function or reference type. */
if (TREE_CODE (arg) == FUNCTION_TYPE
|| TREE_CODE (arg) == METHOD_TYPE
|| TREE_CODE (arg) == REFERENCE_TYPE)
quals = cp_type_quals (arg);
else
quals = cp_type_quals (arg) | cp_type_quals (t);
return cp_build_qualified_type_real
(arg, cp_type_quals (arg) | cp_type_quals (t),
complain | tf_ignore_bad_quals);
(arg, quals, complain | tf_ignore_bad_quals);
}
else if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM)
{

30
gcc/testsuite/g++.dg/template/const1.C Normal file
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@ -0,0 +1,30 @@
// PR c++/28385
// instantiating op() with void()() was making the compiler think that 'fcn'
// was const, so it could eliminate the call.
// { dg-do run }
extern "C" void abort (void);
int barcnt = 0;
class Foo {
public:
template<typename T>
void operator()(const T& fcn) {
fcn();
}
};
void bar() {
barcnt++;
}
int main() {
Foo myFoo;
myFoo(bar);
myFoo(&bar);
if (barcnt != 2)
abort ();
return 0;
}