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cmd/compile: always write pack files

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By always writing out pack files, the object file format can be
simplified somewhat. In particular, the export data format will no
longer require escaping, because the pack file provides appropriate
framing.

This CL does not affect build systems that use -pack, which includes
all major Go build systems (cmd/go, gb, bazel).

Also, existing package import logic already distinguishes pack/object
files based on file contents rather than file extension.

The only exception is cmd/pack, which specially handled object files
created by cmd/compile when used with the 'c' mode. This mode is
extended to now recognize the pack files produced by cmd/compile and
handle them as before.

Passes toolstash-check.

Updates #21705.
Updates #24512.

Change-Id: Idf131013bfebd73a5cde7e087eb19964503a9422
Reviewed-on: https://go-review.googlesource.com/102236
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Matthew Dempsky 2018-03-22 13:51:13 -07:00
parent 699b0d4e52
commit ea668e18a6
3 changed files with 154 additions and 121 deletions
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2
src/cmd/compile/internal/gc/main.go
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@ -211,7 +211,7 @@ func Main(archInit func(*Arch)) {
flag.BoolVar(&nolocalimports, "nolocalimports", false, "reject local (relative) imports")
flag.StringVar(&outfile, "o", "", "write output to `file`")
flag.StringVar(&myimportpath, "p", "", "set expected package import `path`")
flag.BoolVar(&writearchive, "pack", false, "write package file instead of object file")
flag.BoolVar(&writearchive, "pack", false, "write to file.a instead of file.o")
objabi.Flagcount("r", "debug generated wrappers", &Debug['r'])
flag.BoolVar(&flag_race, "race", false, "enable race detector")
objabi.Flagcount("s", "warn about composite literals that can be simplified", &Debug['s'])