BSD systems don't place bash in /bin and a lot of the dart tools
hardcode a #!/bin/bash shebang that fails the 'all' target build
(not able to execute dart2js since the interpreter is not found).
Solve the issue by using #!/usr/bin/env as the shebang. For scripts
that need to pass arguments to bash modify the script to use the set
command as the first executed line of shell.
BUG=
R=whesse@google.com
Review URL: https://codereview.chromium.org/1552313002 .
The shell scripts in sdk/sdk are using ReleaseIA32 as the default build
configuration in the case one is not provided as an environment
variable. This is arbitrary so a check of the available builds is
performed and if ReleaseIA32 is available it is selected. Otherwise, an
arbitrary configuration is selected (currently the last one
lexicographically). In the case where there are no subfolders in the
"out" folder, ReleaseIA32 is selected, in order to produce the same
error that used to be produced before (this can be changed to a custom
message for user-friendliness).
Currently only the "dart" shell script is changed and if the change is
accepted, the others will be changed too.
R=floitsch@google.com, zerny@google.com
Review URL: https://codereview.chromium.org//1276333002 .
