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https://github.com/golang/go
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cfd89164bb
Continuation of CL 20111. Change-Id: Ie2f62237e6ec316989c021de9b267cc9d6ee6676 Reviewed-on: https://go-review.googlesource.com/32830 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
62 lines
1.5 KiB
Bash
62 lines
1.5 KiB
Bash
#!/usr/bin/env bash
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# Copyright 2016 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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# A simple script to compare differences between
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# assembly listings for packages built with different
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# compiler flags. It is useful to inspect the impact
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# of a compiler change across all std lib packages.
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#
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# The script builds the std library (make.bash) once
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# with FLAGS1 and once with FLAGS2 and compares the
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# "go build <pkg>" assembly output for each package
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# and lists the packages with differences.
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#
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# It leaves and old.txt and new.txt file in the package
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# directories for the packages with differences.
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FLAGS1="-newexport=0"
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FLAGS2="-newexport=1"
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echo
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echo
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echo "1a) clean build using $FLAGS1"
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(export GO_GCFLAGS="$FLAGS1"; sh make.bash)
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echo
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echo
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echo "1b) save go build output for all packages"
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for pkg in `go list std`; do
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echo $pkg
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DIR=$GOROOT/src/$pkg
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go build -gcflags "$FLAGS1 -S" -o /dev/null $pkg &> $DIR/old.txt
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done
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echo
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echo
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echo "2a) clean build using $FLAGS2"
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(export GO_GCFLAGS="$FLAGS2"; sh make.bash)
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echo
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echo
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echo "2b) save go build output for all packages"
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for pkg in `go list std`; do
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echo $pkg
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DIR=$GOROOT/src/$pkg
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go build -gcflags "$FLAGS2 -S" -o /dev/null $pkg &> $DIR/new.txt
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done
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echo
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echo
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echo "3) compare assembly files"
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for pkg in `go list std`; do
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DIR=$GOROOT/src/$pkg
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if cmp $DIR/old.txt $DIR/new.txt &> /dev/null
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then rm $DIR/old.txt $DIR/new.txt
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else echo "==> $DIR"
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fi
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done
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