[swift-dev] Why are we re-linking?

[Jordan Rose]

I imagine it's because your git hash has changed, which is used in the --version output for swiftc. I'm not sure how to avoid that cost entirely, but we could add a CMake option to not do it (which you could set locally), and we could probably move it to a library that isn't used by most of those tools (so that we're only re-linking swiftc).

Jordan

> On Apr 6, 2016, at 10:48, Dave Abrahams via swift-dev <swift-dev at swift.org> wrote:
> 
> 
> Can anyone explain why we're re-linking all these C++ executables when I
> make changes only to the standard library?
> 
> [5/130] Linking CXX static library lib/libswiftBasic.a
> [6/130] Linking CXX shared library lib/libswiftDemangle.dylib
> [7/130] Linking CXX executable bin/swift
> [8/130] Linking CXX executable bin/swift-demangle
> [9/130] Linking CXX executable bin/sil-opt
> [10/130] Linking CXX executable bin/swift-ide-test
> [11/130] Linking CXX executable bin/lldb-moduleimport-test
> [12/130] Linking CXX executable bin/sil-extract
> [13/130] Linking CXX executable bin/swift-llvm-opt
> [14/130] Linking CXX shared library lib/libsourcekitdInProc.dylib
> [15/130] Linking CXX executable lib/sourcekitd.framework/Versions/A/XPCServices/SourceKitService.xpc/Contents/MacOS/SourceKitService
> [16/130] Compiling /Users/dave/src/s/build/Ninja-RelWithDebInfoAssert+stdlib-DebugAssert/swift-macosx-x86_64/stdlib/public/core/macosx/x86_64/Swift.o
> [17/130] Linking CXX shared library lib/sourcekitd.framework/Versions/A/sourcekitd
> [18/130] Linking CXX executable bin/sourcekitd-test
> [19/130] Linking CXX executable bin/sourcekitd-repl
> [20/130] Linking CXX executable bin/complete-test
> 
> I imagine we might speed up stdlib development cycles a bit if we could
> avoid that work.
> 
> Thanks,
> 
> -- 
> Dave
> 
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