If you compile with the -v option you’ll see how -frontend is used, (below, with some comments by me):
frank@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-boun...@swift.org [mailto:swift-users-boun...@swift.org] On Behalf Of Atul Sowani via swift-users Sent: Tuesday, December 5, 2017 11:10 PM To: swift-users@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_r...@apple.com <mailto:jordan_r...@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@swift.org <mailto:swift-users@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@swift.org <mailto:swift-users@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. _______________________________________________ swift-users mailing list swift-users@swift.org <mailto:swift-users@swift.org> https://lists.swift.org/mailman/listinfo/swift-users _______________________________________________ swift-users mailing list swift-users@swift.org <mailto:swift-users@swift.org> https://lists.swift.org/mailman/listinfo/swift-users
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