[swift-users] what is the use of "-frontend" argument to swift?

[Frank Swarbrick]

If you compile with the -v option you’ll see how -frontend is used, (below, with some comments by me):

 

frank at DESKTOP-6Q7P3OK:~/src/swift$ swiftc -v -module-name CTest CTest.swift ../c/CTest.o

Swift version 4.0.2 (swift-4.0.2-RELEASE)

Target: x86_64-unknown-linux-gnu

 

Compile:

/home/frank/swift-4.0.2-RELEASE-ubuntu16.04/usr/bin/swift -frontend -c -primary-file CTest.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -color-diagnostics -module-name CTest -o /tmp/CTest-f4b853.o

 

Extract “autolink data”:

/home/frank/swift-4.0.2-RELEASE-ubuntu16.04/usr/bin/swift-autolink-extract /tmp/CTest-f4b853.o ../c/CTest.o -o /tmp/CTest-8bd3ee.autolink

 

Link:

/usr/bin/clang++ -fuse-ld=gold -target x86_64-unknown-linux-gnu -Xlinker -rpath -Xlinker /home/frank/swift-4.0.2-RELEASE-ubuntu16.04/usr/lib/swift/linux /home/frank/swift-4.0.2-RELEASE-ubuntu16.04/usr/lib/swift/linux/x86_64/swift_begin.o /tmp/CTest-f4b853.o ../c/CTest.o -L /home/frank/swift-4.0.2-RELEASE-ubuntu16.04/usr/lib/swift/linux -lswiftCore --target=x86_64-unknown-linux-gnu @/tmp/CTest-8bd3ee.autolink /home/frank/swift-4.0.2-RELEASE-ubuntu16.04/usr/lib/swift/linux/x86_64/swift_end.o -o CTest

 

 

From: swift-users-bounces at swift.org [mailto:swift-users-bounces at swift.org] On Behalf Of Atul Sowani via swift-users
Sent: Tuesday, December 5, 2017 11:10 PM
To: swift-users at swift.org
Subject: Re: [swift-users] what is the use of "-frontend" argument to swift?

 

Thanks Kyle and Jordan! That's the information I was looking for. Anyway I am not using these options explicitly, but found that they are invoked while Swift test suite is run. A few test cases are failing for me on ppc64le and while analyzing it I came across these options. Thanks for the info!

 

Best regards,

Atul.

 

On Wed, Dec 6, 2017 at 4:16 AM, Jordan Rose <jordan_rose at apple.com <mailto:jordan_rose at apple.com> > wrote:

-c is an alias for -emit-object. -frontend is "magically start talking to Swift's implementation details" and you shouldn't use it. More info in docs/Driver.md <https://github.com/apple/swift/blob/master/docs/Driver.md> .

 

Jordan

 





On Dec 5, 2017, at 14:23, Kyle Murray via swift-users <swift-users at swift.org <mailto:swift-users at swift.org> > wrote:

 

Looks like it's an alias for -emit-object:

 

https://github.com/apple/swift/blob/master/include/swift/Option/Options.td#L576

 

...which will give an object file as output rather than the default, an executable. 

 

-Kyle





On Dec 5, 2017, at 1:49 AM, Atul Sowani via swift-users <swift-users at swift.org <mailto:swift-users at swift.org> > wrote:

 

Hi,

 

What is the purpose of "-frontend -c" arguments of swift? I tried "swift --help" but that does not mention it. Also I couldn't find it easily in any swift documents. Can somebody kindly let me know the purpose of these arguments?

 

Thanks,

Atul.

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