[Driver] Add support for -fno-builtin-foo options.
Addresses PR4941 and rdar://6756912.
http://reviews.llvm.org/D15195
llvm-svn: 256937
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 7923b83..8468105 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -4740,11 +4740,33 @@
A->render(Args, CmdArgs);
}
- // -fbuiltin is default unless -mkernel is used
- if (!Args.hasFlag(options::OPT_fbuiltin, options::OPT_fno_builtin,
- !Args.hasArg(options::OPT_mkernel)))
+ // -fbuiltin is default unless -mkernel is used.
+ bool UseBuiltins =
+ Args.hasFlag(options::OPT_fbuiltin, options::OPT_fno_builtin,
+ !Args.hasArg(options::OPT_mkernel));
+ if (!UseBuiltins)
CmdArgs.push_back("-fno-builtin");
+ // -ffreestanding implies -fno-builtin.
+ if (Args.hasArg(options::OPT_ffreestanding))
+ UseBuiltins = false;
+
+ // Process the -fno-builtin-* options.
+ for (const auto &Arg : Args) {
+ const Option &O = Arg->getOption();
+ if (!O.matches(options::OPT_fno_builtin_))
+ continue;
+
+ Arg->claim();
+ // If -fno-builtin is specified, then there's no need to pass the option to
+ // the frontend.
+ if (!UseBuiltins)
+ continue;
+
+ StringRef FuncName = Arg->getValue();
+ CmdArgs.push_back(Args.MakeArgString("-fno-builtin-" + FuncName));
+ }
+
if (!Args.hasFlag(options::OPT_fassume_sane_operator_new,
options::OPT_fno_assume_sane_operator_new))
CmdArgs.push_back("-fno-assume-sane-operator-new");