On Tue, Apr 28, 2020 at 10:49 PM Vincent Blanchon <blanchon.vinc...@gmail.com> 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/CAOyqgcXfXPmA5YiVZ39JqvpgqZ7mAn84EYiO-ZUXrn9kqjbSMQ%40mail.gmail.com.
