[Scons-users] AddOption() strange behaviour

[Hartmut Brandt]

Hi Dirk

On Thu, 11 Dec 2014, Dirk B?chle wrote:

DB>Hi Hartmut,
DB>
DB>On 11.12.2014 12:42, Hartmut.Brandt at dlr.de wrote:
DB>> Hi,
DB>> 
DB>> looks like there is something broken with the option parser. I have
DB>> 
DB>> AddOption('--build',
DB>>    dest = 'build',
DB>>    type = 'string',
DB>>    nargs = 1,
DB>>    action = 'store',
DB>>    metavar = 'DIR',
DB>>    default = '.',
DB>>    help = 'build directory')
DB>> 
DB>> AddOption('--prefix',
DB>>    dest = 'build',
DB>>    type = 'string',
DB>>    nargs = 1,
DB>>    action = 'store',
DB>>    metavar = 'DIR',
DB>>    default = '/ndvb',
DB>>    help = 'build directory')
DB>> in my SConstruct file. If I call
DB>errm...did you already notice that you are using the same "dest" string for
DB>both of your options? I guess this is where your problems are coming from.

Ahh, well. This crept in when I copy and pasted the stuff by hand into the 
mail. Here is the actual test that I use:

AddOption('--prefix',
   dest = 'prefix',
   type = 'string',
   nargs = 1,
   action = 'store',
   metavar = 'DIR',
   default = '/prefix',
   help = 'set the prefix directory')

AddOption('--build',
   dest = 'build',
   type = 'string',
   nargs = 1,
   action = 'store',
   metavar = 'DIR',
   default = '/build',
   help = 'set the build directory')

# set up and export the build environment
env = Environment(
   tools = [
      'default'])
Export('env')

# text for -h
# Help(vars.GenerateHelpText(env))

print "prefix=%s" % GetOption('prefix')
print "build=%s" % GetOption('build')

print "COMMAND_LINE_TARGETS=%s" % str(COMMAND_LINE_TARGETS)
print "ARGUMENTS=%s" % str(ARGUMENTS)

It exhibits the same behaviour:

# scons --prefix=prefix --build=build
scons: Reading SConscript files ...
prefix=prefix
build=build
COMMAND_LINE_TARGETS=[]
ARGUMENTS={}
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.

# scons --prefix prefix --build=build
scons: Reading SConscript files ...
prefix=prefix
build=build
COMMAND_LINE_TARGETS=['prefix']
ARGUMENTS={}
scons: done reading SConscript files.
scons: Building targets ...
scons: *** Do not know how to make File target `prefix' 
(/usr/home/brandt_h/src/xtest/prefix).  Stop.
scons: building terminated because of errors.

# scons --prefix=prefix --build build
scons: Reading SConscript files ...
usage: scons [OPTION] [TARGET] ...

SCons Error: --build option requires an argument

# scons --prefix prefix --build build
scons: Reading SConscript files ...
usage: scons [OPTION] [TARGET] ...

SCons Error: --build option requires an argument

If I import OptionParser from python and replace AddOption by a 
corresponding add_option then it works as expected.

When I swap the AddOption() calls then the mis-behaviour of the options 
also swaps. It is independent of the order on the command-line.

harti