https://bugs.llvm.org/show_bug.cgi?id=49293
Bug ID: 49293
Summary: Clang ignores -march when targeting armv7-apple-darwin
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Driver
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
This is a low priority bug since it affects only old hardware targets,
but since it exists in the codebase and I've stumbled upon it I'll
report it.
When running "clang --target=armv7-apple-darwin14 -march=armv8.2-a+dotprod"
MachO::TranslateArgs is called with BoundArch "armv7" and appends
"-march=armv7a" to the list of the command line args:
https://github.com/llvm/llvm-project/blob/llvmorg-13-init/clang/lib/Driver/ToolChains/Darwin.cpp#L2380
Then clang -cc1 uses it, silently ignoring the custom -march.
The same issue was encountered in
https://github.com/tensorflow/tensorflow/issues/40026
and worker around in https://github.com/google/XNNPACK/pull/692/files
by adding -mcpu to the command line. (In my case the workaround would
be "-mcpu=cyclone+dotprod".)
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