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C++1y sized deallocation: if we have a use, but not a definition, of a sized

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deallocation function (and the corresponding unsized deallocation function has
been declared), emit a weak discardable definition of the function that
forwards to the corresponding unsized deallocation.

This allows a C++ standard library implementation to provide both a sized and
an unsized deallocation function, where the unsized one does not just call the
sized one, for instance by putting both in the same object file within an
archive.

llvm-svn: 194055
This commit is contained in:
Richard Smith
2013-11-05 09:12:18 +00:00
parent 2d1d3ca1cc
commit b47c36f8e1
10 changed files with 87 additions and 23 deletions
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5
clang/lib/Frontend/CompilerInvocation.cpp
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@@ -1093,6 +1093,9 @@ void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
Opts.Trigraphs = !Opts.GNUMode;
Opts.DollarIdents = !Opts.AsmPreprocessor;
// C++1y onwards has sized global deallocation functions.
Opts.SizedDeallocation = Opts.CPlusPlus1y;
}
/// Attempt to parse a visibility value out of the given argument.
@@ -1310,7 +1313,7 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
Opts.SizedDeallocation |= Args.hasArg(OPT_fsized_deallocation);
Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);