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

Arnold Schwaighofer aschwaighofer at apple.com
Tue Nov 14 09:52:36 CST 2017

> On Nov 14, 2017, at 12:33 AM, Slava Pestov via swift-dev <swift-dev at swift.org> wrote:
> 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.

Yes we build the runtime with the “just built clang”. We should switch over the unit tests tests too. They definitely could call code in the runtime where the ABI difference matters: for example heap object destructors use swiftcc.

> Slava
>> On Nov 13, 2017, at 10:47 PM, Greg Parker via swift-dev <swift-dev at swift.org <mailto: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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