[swift-dev] No attribute(swiftcall) support on Linux?

Slava Pestov spestov at apple.com
Tue Nov 14 02:33:18 CST 2017

This is while building the metadata unit tests — I’m assuming those are built with the host clang? Do we build the runtime with the Swift clang on Linux? If so, we should still be able to use swiftcall.


> On Nov 13, 2017, at 10:47 PM, Greg Parker via swift-dev <swift-dev at swift.org> wrote:
> I see that in our Linux builds clang complains that it does not support the swiftcall attribute.
>     In file included from /home/buildnode/jenkins/workspace/swift-PR-Linux/branch-master/swift/unittests/runtime/Metadata.cpp:13:
>     /home/buildnode/jenkins/workspace/swift-PR-Linux/branch-master/swift/include/swift/Runtime/Metadata.h:3015:1: warning: unknown attribute 'swiftcall' ignored [-Wunknown-attributes]
> How bad is this? Do we not use a custom calling convention on Linux platforms today?
> -- 
> Greg Parker     gparker at apple.com <mailto:gparker at apple.com>     Runtime Wrangler
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