Hello Ian, Thank you again for your reply! I thought Go would compile all the C files in one .go, that makes sense.
By the way, how Go would deal with those files if cgo is not enabled - meaning the internal linker will do the job? How the internal linker can deal with that? Le jeudi 30 avril 2020 07:52:03 UTC+4, Ian Lance Taylor a écrit : > > On Tue, Apr 28, 2020 at 10:49 PM Vincent Blanchon > <blancho...@gmail.com <javascript:>> wrote: > > > > I'm building a simple program that has a dependency to > github.com/DataDog/zstd, a wrapper of a C code. > > So by default, Go will use the external linker. When debugging with, I > can see > > > > host link: "clang" "-m64" "-Wl,-headerpad,1144" "-Wl,-no_pie" > "-Wl,-pagezero_size,4000000" "-o" > "/var/folders/bb/w1lgkjdx47qd7695hb5r400h0000gn/T/go-build122622791/b001/exe/a.out" > > "-Qunused-arguments" > "/var/folders/bb/w1lgkjdx47qd7695hb5r400h0000gn/T/go-link-023224426/go.o" > "/var/folders/bb/w1lgkjdx47qd7695hb5r400h0000gn/T/go-link-023224426/000000.o" > [...] > "/var/folders/bb/w1lgkjdx47qd7695hb5r400h0000gn/T/go-link-023224426/000053.o" > "/var/folders/bb/w1lgkjdx47qd7695hb5r400h0000gn/T/go-link-023224426/000054.o" > "/var/folders/bb/w1lgkjdx47qd7695hb5r400h0000gn/T/go-link-023224426/000055.o" > "-g" "-O2" "-g" "-O2" "-g" "-O2" "-lpthread" "-g" "-O2" "-framework" > "CoreFoundation" "-framework" "Security" "-no-pie" > > > > It links 55 files, from 000000.o to 000055.oIf I had more custom debug, > I can see than those files are mostly duplication: > > > > 000004.o is > /path/to/go-build/67/678a3a394ba4feae32a2ddb829ea65c1cf24be64248dcbcc3dae709b8e3b826d-d > > github.com/DataDog/zstd > /path/to/go-build/67/678a3a394ba4feae32a2ddb829ea65c1cf24be64248dcbcc3dae709b8e3b826d-d(_x005.o) > > > > 000005.o is > /path/to/go-build/67/678a3a394ba4feae32a2ddb829ea65c1cf24be64248dcbcc3dae709b8e3b826d-d > > github.com/DataDog/zstd > /path/to/go-build/67/678a3a394ba4feae32a2ddb829ea65c1cf24be64248dcbcc3dae709b8e3b826d-d(_x006.o) > > > > > > I can see 40 times this zstd package among the 55 files. Is it expected? > What is the difference between them? > > > > Also, what would happen to the non known cgo packages (not net, os/user > or runtime/cgo) if cgo is not enabled? How the internal linker will manage > this cgo package? > > I may be missing something, but that doesn't look like duplication to > me. It looks like different files from an archive. The first one is > _x005.o and the second one is _x006.o. > > You will get files like these for each .c file in a package that uses cgo. > > Ian > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/38760d5d-b8e3-4a42-b087-8b81ab4ebd87%40googlegroups.com.
