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  # For packages with differences it leaves files named
    18  # old.txt and new.txt.
    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
    62  

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