[PATCH] D86707: [SystemZ][z/OS] Adding initial toolchain for z/OS

[Hubert Tong via Phabricator via cfe-commits]

hubert.reinterpretcast added inline comments.


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Comment at: clang/lib/Driver/ToolChains/ZOS.h:25
+
+  bool isPICDefault() const override { return false; }
+  bool isPIEDefault() const override { return false; }
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According to the RFC re: LLVM on z/OS, the initial support in LLVM for z/OS is only for XPLink. My understanding is that all XPLink applications are DLL-enabled. Does being DLL-enabled not imply that the code is position-independent?

I understand that the value of the `__DLL__` predefined macro from the XL C compiler does not reflect the implicit DLL-enablement of XPLink code; however, I also note that the same compiler claims falsely that `Option NODLL is ignored because option XPLINK is specified` when `-qnodll` does actually suppress the effect of an earlier `-qdll` in causing `__DLL__` to be defined.


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  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D86707/new/

https://reviews.llvm.org/D86707