[PATCH] D114023: [Driver] Pass --fix-cortex-a53-843419 automatically on Fuchsia

Petr Hosek via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Tue Nov 30 10:08:56 PST 2021

phosek added inline comments.

Comment at: clang/lib/Driver/ToolChains/Fuchsia.cpp:91
+    std::string CPU = getCPUName(D, Args, Triple);
+    if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
+      CmdArgs.push_back("--fix-cortex-a53-843419");
mcgrathr wrote:
> How does this relate to -march, -mtune, and/or -mcpu?
> It's not at all clear to me how we discern automatically when a A53 might be included in the supported target CPU set.  I'm not entirely sure we should have automatic injection in some cases where A53 is a valid target but not all.  That is, if some compiler option combinations that produce code meant to be compatible with an A53 won't automatically get the --fix option, then perhaps it's better to require the explicit --fix option when supporting A53 is the explicit intent.
This is the same logic as used by the [Gnu driver](https://github.com/llvm/llvm-project/blob/7a7c059d867554e116244ad5639d05d75ed1a7cd/clang/lib/Driver/ToolChains/Gnu.cpp#L451). `getCPUName` only considers `-mcpu`, it ignores `-march` and `-mtune` as far as I can tell.

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