[swift-dev] How to test -assume-single-threaded option?

[Slava Pestov]

Hi Jiho,

Some low-level frontend flags are not exposed to the driver.

To pass frontend flags directly via the driver, use -Xfrontend, eg

swiftc -Xfrontend -assume-single-threaded mytest.swift

This is different from -frontend — -frontend skips the driver entirely, -Xfrontend runs the driver but passes the next argument to each frontend invocation.

Slava

> On Jan 13, 2017, at 1:01 PM, Jiho Choi via swift-dev <swift-dev at swift.org> wrote:
> 
> Hi,
> 
> I want to try -assume-single-threaded option to measure the overhead of atomic operations for reference counting.  However, it seems that the option works as intended with the frontend but not with the driver.  In other words, I tried two commands below, and only the first command replaced atomic operations.
> 
> swiftc -frontend -emit-sil -assume-single-threaded mytest.swift
> swiftc -emit-sil -assume-single-threaded mytest.swift
> 
> Is the option disabled for the driver for some reason?
> 
> Thanks,
> Jiho
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