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unix: add tool for merging duplicate code

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mkmerge.go parses generated code (z*_GOOS_GOARCH.go) and merges
duplicate consts, funcs, and types, into one file per GOOS (z*_GOOS.go).

Updates golang/go#33059

Change-Id: I1439f260dc8c09e887e5917a3101c39b080f2882
Reviewed-on: https://go-review.googlesource.com/c/sys/+/221317
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Johan Jansson
2020-03-01 02:57:34 +00:00
committed by Ian Lance Taylor
parent d5e6a3e2c0
commit 6b2465a022
3 changed files with 1037 additions and 0 deletions
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unix/README.md
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@@ -149,6 +149,17 @@ To add a constant, add the header that includes it to the appropriate variable.
Then, edit the regex (if necessary) to match the desired constant. Avoid making
the regex too broad to avoid matching unintended constants.
### mkmerge.go
This program is used to extract duplicate const, func, and type declarations
from the generated architecture-specific files listed below, and merge these
into a common file for each OS.
The merge is performed in the following steps:
1. Construct the set of common code that is idential in all architecture-specific files.
2. Write this common code to the merged file.
3. Remove the common code from all architecture-specific files.
## Generated files