/usr/share/go-1.7/src/cmp.bash is in golang-1.7-src 1.7.4-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | #!/usr/bin/env bash
# Copyright 2016 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
# A simple script to compare differences between
# assembly listings for packages built with different
# compiler flags. It is useful to inspect the impact
# of a compiler change across all std lib packages.
#
# The script builds the std library (make.bash) once
# with FLAGS1 and once with FLAGS2 and compares the
# "go build <pkg>" assembly output for each package
# and lists the packages with differences.
#
# It leaves and old.txt and new.txt file in the package
# directories for the packages with differences.
FLAGS1="-newexport=0"
FLAGS2="-newexport=1"
echo
echo
echo "1a) clean build using $FLAGS1"
(export GO_GCFLAGS="$FLAGS1"; sh make.bash)
echo
echo
echo "1b) save go build output for all packages"
for pkg in `go list std`; do
echo $pkg
DIR=$GOROOT/src/$pkg
go build -gcflags "$FLAGS1 -S" -o /dev/null $pkg &> $DIR/old.txt
done
echo
echo
echo "2a) clean build using $FLAGS2"
(export GO_GCFLAGS="$FLAGS2"; sh make.bash)
echo
echo
echo "2b) save go build output for all packages"
for pkg in `go list std`; do
echo $pkg
DIR=$GOROOT/src/$pkg
go build -gcflags "$FLAGS2 -S" -o /dev/null $pkg &> $DIR/new.txt
done
echo
echo
echo "3) compare assembly files"
for pkg in `go list std`; do
DIR=$GOROOT/src/$pkg
if cmp $DIR/old.txt $DIR/new.txt &> /dev/null
then rm $DIR/old.txt $DIR/new.txt
else echo "==> $DIR"
fi
done
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