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re PR c++/53159 (Missing narrowing check)

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/cp
2014-07-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53159
	* call.c (build_user_type_conversion_1): Copy LOOKUP_NO_NARROWING
	into convflags.
	* decl.c (check_initializer): Don't call check_narrowing here,
	set LOOKUP_NO_NARROWING.
	* typeck2.c (digest_init_r): Likewise.

/testsuite
2014-07-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53159
	* g++.dg/cpp0x/Wnarrowing1.C: New.

From-SVN: r212469
This commit is contained in:
Paolo Carlini 2014-07-11 21:53:59 +00:00 committed by Paolo Carlini
parent 54c61de798
commit 2410819b6d
6 changed files with 36 additions and 4 deletions
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9
gcc/cp/ChangeLog
View File

@ -1,3 +1,12 @@
2014-07-11 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/53159
* call.c (build_user_type_conversion_1): Copy LOOKUP_NO_NARROWING
into convflags.
* decl.c (check_initializer): Don't call check_narrowing here,
set LOOKUP_NO_NARROWING.
* typeck2.c (digest_init_r): Likewise.
2014-07-10 Jason Merrill <jason@redhat.com>
PR c++/61661

3
gcc/cp/call.c
View File

@ -3586,7 +3586,8 @@ build_user_type_conversion_1 (tree totype, tree expr, int flags,
/* It's OK to bind a temporary for converting constructor arguments, but
not in converting the return value of a conversion operator. */
convflags = ((flags & LOOKUP_NO_TEMP_BIND) | LOOKUP_NO_CONVERSION);
convflags = ((flags & LOOKUP_NO_TEMP_BIND) | LOOKUP_NO_CONVERSION
| (flags & LOOKUP_NO_NARROWING));
flags &= ~LOOKUP_NO_TEMP_BIND;
if (ctors)

3
gcc/cp/decl.c
View File

@ -5756,8 +5756,7 @@ check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
else
{
init = reshape_init (type, init, tf_warning_or_error);
if (SCALAR_TYPE_P (type))
check_narrowing (type, init);
flags |= LOOKUP_NO_NARROWING;
}
}
else if (TREE_CODE (init) == TREE_LIST

2
gcc/cp/typeck2.c
View File

@ -1027,7 +1027,7 @@ digest_init_r (tree type, tree init, bool nested, int flags,
tree *exp;
if (nested)
check_narrowing (type, init);
flags |= LOOKUP_NO_NARROWING;
init = convert_for_initialization (0, type, init, flags,
ICR_INIT, NULL_TREE, 0,
complain);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2014-07-11 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/53159
* g++.dg/cpp0x/Wnarrowing1.C: New.
2014-07-11 Andreas Schwab <schwab@linux-m68k.org>
PR preprocessor/61389

18
gcc/testsuite/g++.dg/cpp0x/Wnarrowing1.C Normal file
View File

@ -0,0 +1,18 @@
// PR c++/53159
// { dg-do compile { target c++11 } }
// { dg-options "-Wnarrowing -Wno-overflow" }
struct X
{
constexpr operator int() { return __INT_MAX__; }
};
int f() { return __INT_MAX__; }
signed char a { __INT_MAX__ }; // { dg-warning "narrowing conversion" }
signed char b { f() }; // { dg-warning "narrowing conversion" }
signed char c { X{} }; // { dg-warning "narrowing conversion" }
signed char ar[] { __INT_MAX__ }; // { dg-warning "narrowing conversion" }
signed char br[] { f() }; // { dg-warning "narrowing conversion" }
signed char cr[] { X{} }; // { dg-warning "narrowing conversion" }