On 4 Oct 2012 at 1:36, Richard Smith wrote:
> Hi,
>
> The attached patches to compiler-rt and Clang add a new runtime library
> which -fcatch-undefined-behavior will call into when it detects undefined
> behavior.
Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp (revision 164853)
+++ lib/Driver/Tools.cpp (working copy)
@@ -1458,6 +1458,23 @@
}
}
+/// If UndefinedBehaviorSanitizer is enabled, add appropriate linker flags
+/// (Linux).
+static void addUbsanRTLinux(const ToolChain &TC, const ArgList &Args,
+ ArgStringList &CmdArgs) {
+ if (!Args.hasArg(options::OPT_fcatch_undefined_behavior))
+ return;
+ if (!Args.hasArg(options::OPT_shared)) {
+ // LibUbsan is "libclang_rt.ubsan-<ArchName>.a" in the Linux library
+ // resource directory.
+ SmallString<128> LibUbsan(TC.getDriver().ResourceDir);
+ llvm::sys::path::append(LibUbsan, "lib", "linux",
+ (Twine("libclang_rt.ubsan-") +
+ TC.getArchName() + ".a"));
+ CmdArgs.push_back(Args.MakeArgString(LibUbsan));
+ }
+}
would it be possible to check for -ffreestanding here and not add the library
forcibly in that case? i'm (once again ;) thinking of a kernel environment here
where using such a library may not be an option (no c++ allowed for one) and the
kernel would like to handle these functions in its own way (much like it handles
memcpy, etc already).
cheers,
PaX Team
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