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      1 #!/bin/bash
      2 #
      3 # Copyright 2018 Google Inc. All rights reserved
      4 #
      5 # Licensed under the Apache License, Version 2.0 (the "License");
      6 # you may not use this file except in compliance with the License.
      7 # You may obtain a copy of the License at
      8 #
      9 #      http:#www.apache.org/licenses/LICENSE-2.0
     10 #
     11 # Unless required by applicable law or agreed to in writing, software
     12 # distributed under the License is distributed on an "AS IS" BASIS,
     13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 # See the License for the specific language governing permissions and
     15 # limitations under the License.
     16 
     17 set -u
     18 
     19 mk="$@"
     20 
     21 function build() {
     22   cat <<EOF > Makefile
     23 FOO $1$= bar
     24 FOO $2 baz
     25 all:
     26 EOF
     27 
     28   echo "Testcase: $1 $2"
     29   if echo "${mk}" | grep -q "^make"; then
     30     # Make doesn't support final assignment
     31     echo "Makefile:2: *** cannot assign to readonly variable: FOO"
     32   else
     33     ${mk} 2>&1 && echo "Clean exit"
     34   fi
     35 }
     36 
     37 build "=" "="
     38 build "=" ":="
     39 build "=" "+="
     40 
     41 build ":=" ":="
     42 build ":=" "+="
     43 build ":=" "="
     44 
     45 build "+=" ":="
     46 build "+=" "+="
     47 build "+=" "="
     48