re PR c++/50810 (c++0x-compat does not warn about narrowing conversions)
/c-family 2011-10-23 Paolo Carlini <paolo.carlini@oracle.com> PR c++/50810 * c-opts.c (c_common_handle_option): Enable -Wnarrowing as part of -Wall; include -Wnarrowing in -Wc++0x-compat; adjust default Wnarrowing for C++0x and C++98. * c.opt ([Wnarrowing]): Update. /cp 2011-10-23 Paolo Carlini <paolo.carlini@oracle.com> PR c++/50810 * typeck2.c (check_narrowing): Adjust OPT_Wnarrowing diagnostics. (digest_init_r): Call check_narrowing irrespective of the C++ dialect. * decl.c (check_initializer): Likewise. * semantics.c (finish_compound_literal): Likewise. /testsuite 2011-10-23 Paolo Carlini <paolo.carlini@oracle.com> PR c++/50810 * g++.dg/cpp0x/warn_cxx0x2.C: New. * g++.dg/cpp0x/warn_cxx0x3.C: Likewise. 2011-10-23 Paolo Carlini <paolo.carlini@oracle.com> PR c++/50810 * doc/invoke.texi ([-Wnarrowing], [-Wc++0x-compat]): Update. From-SVN: r180343
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2011-10-23 Paolo Carlini <paolo.carlini@oracle.com>
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PR c++/50810
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* doc/invoke.texi ([-Wnarrowing], [-Wc++0x-compat]): Update.
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2011-10-23 Tom de Vries <tom@codesourcery.com>
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PR tree-optimization/50763
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@ -1,3 +1,11 @@
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2011-10-23 Paolo Carlini <paolo.carlini@oracle.com>
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PR c++/50810
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* c-opts.c (c_common_handle_option): Enable -Wnarrowing as part
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of -Wall; include -Wnarrowing in -Wc++0x-compat; adjust default
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Wnarrowing for C++0x and C++98.
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* c.opt ([Wnarrowing]): Update.
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2011-10-21 Paolo Carlini <paolo.carlini@oracle.com>
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PR c++/45385
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@ -406,6 +406,7 @@ c_common_handle_option (size_t scode, const char *arg, int value,
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warn_reorder = value;
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warn_cxx0x_compat = value;
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warn_delnonvdtor = value;
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warn_narrowing = value;
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}
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cpp_opts->warn_trigraphs = value;
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@ -436,6 +437,10 @@ c_common_handle_option (size_t scode, const char *arg, int value,
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cpp_opts->warn_cxx_operator_names = value;
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break;
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case OPT_Wc__0x_compat:
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warn_narrowing = value;
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break;
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case OPT_Wdeprecated:
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cpp_opts->cpp_warn_deprecated = value;
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break;
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@ -997,10 +1002,17 @@ c_common_post_options (const char **pfilename)
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if (warn_implicit_function_declaration == -1)
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warn_implicit_function_declaration = flag_isoc99;
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/* If we're allowing C++0x constructs, don't warn about C++0x
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compatibility problems. */
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if (cxx_dialect == cxx0x)
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warn_cxx0x_compat = 0;
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{
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/* If we're allowing C++0x constructs, don't warn about C++98
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identifiers which are keywords in C++0x. */
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warn_cxx0x_compat = 0;
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if (warn_narrowing == -1)
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warn_narrowing = 1;
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}
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else if (warn_narrowing == -1)
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warn_narrowing = 0;
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if (flag_preprocess_only)
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{
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@ -490,8 +490,8 @@ C ObjC C++ ObjC++ Warning
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Warn about use of multi-character character constants
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Wnarrowing
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C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(1)
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-Wno-narrowing In C++0x mode, ignore ill-formed narrowing conversions within { }
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C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) Warning
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Warn about ill-formed narrowing conversions within { }
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Wnested-externs
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C ObjC Var(warn_nested_externs) Warning
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@ -1,3 +1,11 @@
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2011-10-23 Paolo Carlini <paolo.carlini@oracle.com>
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PR c++/50810
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* typeck2.c (check_narrowing): Adjust OPT_Wnarrowing diagnostics.
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(digest_init_r): Call check_narrowing irrespective of the C++ dialect.
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* decl.c (check_initializer): Likewise.
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* semantics.c (finish_compound_literal): Likewise.
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2011-10-21 Paolo Carlini <paolo.carlini@oracle.com>
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PR c++/45385
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@ -5523,7 +5523,7 @@ check_initializer (tree decl, tree init, int flags, tree *cleanup)
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else
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{
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init = reshape_init (type, init, tf_warning_or_error);
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if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
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if (SCALAR_TYPE_P (type))
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check_narrowing (type, init);
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}
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}
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@ -2369,7 +2369,7 @@ finish_compound_literal (tree type, tree compound_literal,
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&& check_array_initializer (NULL_TREE, type, compound_literal))
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return error_mark_node;
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compound_literal = reshape_init (type, compound_literal, complain);
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if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type)
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if (SCALAR_TYPE_P (type)
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&& !BRACE_ENCLOSED_INITIALIZER_P (compound_literal))
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check_narrowing (type, compound_literal);
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if (TREE_CODE (type) == ARRAY_TYPE
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@ -803,8 +803,10 @@ check_narrowing (tree type, tree init)
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}
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if (!ok)
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pedwarn (input_location, OPT_Wnarrowing, "narrowing conversion of %qE "
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"from %qT to %qT inside { }", init, ftype, type);
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emit_diagnostic ((cxx_dialect != cxx98) ? DK_PEDWARN : DK_WARNING,
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input_location, OPT_Wnarrowing,
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"narrowing conversion of %qE from %qT to %qT inside { }",
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init, ftype, type);
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}
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/* Process the initializer INIT for a variable of type TYPE, emitting
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@ -901,7 +903,7 @@ digest_init_r (tree type, tree init, bool nested, int flags,
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{
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tree *exp;
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if (cxx_dialect != cxx98 && nested)
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if (nested)
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check_narrowing (type, init);
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init = convert_for_initialization (0, type, init, flags,
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ICR_INIT, NULL_TREE, 0,
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@ -2365,17 +2365,18 @@ an instance of a derived class through a pointer to a base class if the
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base class does not have a virtual destructor. This warning is enabled
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by @option{-Wall}.
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@item -Wno-narrowing @r{(C++ and Objective-C++ only)}
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@item -Wnarrowing @r{(C++ and Objective-C++ only)}
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@opindex Wnarrowing
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@opindex Wno-narrowing
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With -std=c++0x, suppress the diagnostic required by the standard for
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narrowing conversions within @samp{@{ @}}, e.g.
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Warn when a narrowing conversion occurs within @samp{@{ @}}, e.g.
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@smallexample
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int i = @{ 2.2 @}; // error: narrowing from double to int
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@end smallexample
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This flag can be useful for compiling valid C++98 code in C++0x mode.
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This flag is included in @option{-Wall} and @option{-Wc++0x-compat}.
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With -std=c++0x, @option{-Wno-narrowing} suppresses the diagnostic
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required by the standard.
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@item -Wnoexcept @r{(C++ and Objective-C++ only)}
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@opindex Wnoexcept
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@ -4066,7 +4067,8 @@ ISO C and ISO C++, e.g.@: request for implicit conversion from
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@item -Wc++0x-compat @r{(C++ and Objective-C++ only)}
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Warn about C++ constructs whose meaning differs between ISO C++ 1998 and
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ISO C++ 200x, e.g., identifiers in ISO C++ 1998 that will become keywords
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in ISO C++ 200x. This warning is enabled by @option{-Wall}.
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in ISO C++ 200x. This warning turns on @option{-Wnarrowing} and is
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enabled by @option{-Wall}.
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@item -Wcast-qual
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@opindex Wcast-qual
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@ -1,3 +1,9 @@
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2011-10-23 Paolo Carlini <paolo.carlini@oracle.com>
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PR c++/50810
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* g++.dg/cpp0x/warn_cxx0x2.C: New.
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* g++.dg/cpp0x/warn_cxx0x3.C: Likewise.
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2011-10-23 Tom de Vries <tom@codesourcery.com>
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PR tree-optimization/50763
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@ -0,0 +1,4 @@
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// PR c++/50810
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// { dg-options "-std=gnu++98 -Wc++0x-compat" }
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signed char data[] = { 0xff }; // { dg-warning "narrowing" }
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@ -0,0 +1,4 @@
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// PR c++/50810
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// { dg-options "-std=gnu++98 -Wc++0x-compat -Wno-narrowing" }
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signed char data[] = { 0xff };
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