Text file src/cmp.bash

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

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