gcc_update: watch empty files

[Alfred Minarik <alfred dot minarik at lion dot cc>]

There are quite some empty files in the gcc repository. At least some
of them useful (like in the libstdc++-v3 testsuite). No problem if
you use CVS, but one if you use "diff -N" and "patch -E". So every
time using the new snapshot patches new empty files will miss.

And it will be the same when one day there will be a 2.95.3 to 3.0 patch.
So I propose this for trunk and branch.

The distributed .brik file holds all the information we need.
contrib/gcc_update should use it.

A very minor problem, but it annoyed me.


2001-03-21  Alfred Minarik  <alfred.minarik@lion.cc>

	* gcc_update: Touch missing empty files




*** gcc_old/contrib/gcc_update	Wed Mar 21 10:19:08 2001
--- gcc_new/contrib/gcc_update	Wed Mar 21 12:51:05 2001
***************
*** 14,20 ****
  #
  # If the first parameter is --touch, no cvs operation will be performed,
  # only generated files that appear to be out of date in the local tree
! # will be touched.
  #
  # If the first parameter is --list, a list of the generated files and
  # their dependencies will be printed; --help prints this message.
--- 14,20 ----
  #
  # If the first parameter is --touch, no cvs operation will be performed,
  # only generated files that appear to be out of date in the local tree
! # will be touched and missing empty files will be generated.
  #
  # If the first parameter is --list, a list of the generated files and
  # their dependencies will be printed; --help prints this message.
***************
*** 104,113 ****
    test `ls -1dt ${1+"$@"} | sed 1q` != "$1"
  }
  
  
! # This function touches generated files such that the ``end'' user does
  # not have to rebuild them.
  touch_files () {
      files_and_dependencies | while read f deps; do
  	if test -f $f && is_out_of_date "$f" $deps; then
  	    echo Touching "$f"...
--- 104,125 ----
    test `ls -1dt ${1+"$@"} | sed 1q` != "$1"
  }
  
+ # search for empty files scanning .brik
+ empty_files () {
+     if test -f .brik; then
+ 	sed -e '/4294967295b/! d' -e 's/4294967295b *//' .brik
+     fi
+ }
  
! # This function rebuilds empty files (lost by diff and patch)
! # and touches generated files such that the ``end'' user does
  # not have to rebuild them.
  touch_files () {
+     empty_files | while read f; do
+ 	if [ ! -e $f ]; then
+ 	    touch $f 2>/dev/null && echo Creating empty file $f   
+ 	fi	
+     done
      files_and_dependencies | while read f deps; do
  	if test -f $f && is_out_of_date "$f" $deps; then
  	    echo Touching "$f"...



Alfred