[PATCH] D39079: New clang option -fno-plt to avoid PLT for external calls

Reid Kleckner via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Mon Oct 23 13:56:41 PDT 2017

rnk added a comment.

In https://reviews.llvm.org/D39079#904050, @lebedev.ri wrote:

> No tests?

+1, there should be an -emit-llvm test in clang/test/CodeGen/.

Comment at: lib/CodeGen/CGCall.cpp:1859
+    if (auto *Fn = dyn_cast<FunctionDecl>(TargetDecl)) {
+      if (!Fn->isDefined() && !AttrOnCallSite) {
+        FuncAttrs.addAttribute(llvm::Attribute::NonLazyBind);
Remind me what happens when the definition is within the current DSO after linking. I seem to recall that the call through memory is 6 bytes and the direct pcrel call is 5 bytes, and the linker is required to know to rewrite the indirect call to a nop. Is that accurate?


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