Question

我在SCons中遇到AddOption的问题，我为单个选项指定了多个标志。它没有拿起其中一面旗帜。在此示例中，我希望-V和--verbose同时选择相同的选项，但它仅适用于--verbose。

这是一个最小的工作示例。

./SConstruct

AddOption("-V", "--verbose",
          action="store_true", dest="verbose", default=False,
          help="Print everything to stdout")
if not GetOption('help'):
    if GetOption('verbose'):
        print '## VERBOSITORY IS ON  ##'
    else:
        print '## VERBOSITORY IS OFF ##'

在运行时，我们得到以下内容......

+ scons --help
scons: Reading SConscript files ...
scons: done reading SConscript files.
usage: scons [OPTION] [TARGET] ...

SCons Options:
  -b, -d, -e, -m, -S, -t, -w, --environment-overrides, --no-keep-going,
  --no-print-directory, --print-directory, --stop, --touch
                              Ignored for compatibility.
  -c, --clean, --remove       Remove specified targets and dependencies.
  -C DIR, --directory=DIR     Change to DIR before doing anything.
  --cache-debug=FILE          Print CacheDir debug info to FILE.
  --cache-disable, --no-cache
                              Do not retrieve built targets from CacheDir.
  --cache-force, --cache-populate
                              Copy already-built targets into the CacheDir.
  --cache-readonly            Do not update CacheDir with built targets.
  --cache-show                Print build actions for files from CacheDir.
  --config=MODE               Controls Configure subsystem: auto, force,
                                cache.
  -D                          Search up directory tree for SConstruct,
                                build all Default() targets.
  --debug=TYPE                Print various types of debugging information:
                                count, duplicate, explain, findlibs, includes,
                                memoizer, memory, objects, pdb, prepare,
                                presub, stacktrace, time.
  --diskcheck=TYPE            Enable specific on-disk checks.
  --duplicate=DUPLICATE       Set the preferred duplication methods. Must be
                                one of hard-soft-copy, soft-hard-copy,
                                hard-copy, soft-copy, copy
  -f FILE, --file=FILE, --makefile=FILE, --sconstruct=FILE
                              Read FILE as the top-level SConstruct file.
  -h, --help                  Print defined help message, or this one.
  -H, --help-options          Print this message and exit.
  -i, --ignore-errors         Ignore errors from build actions.
  -I DIR, --include-dir=DIR   Search DIR for imported Python modules.
  --implicit-cache            Cache implicit dependencies
  --implicit-deps-changed     Ignore cached implicit dependencies.
  --implicit-deps-unchanged   Ignore changes in implicit dependencies.
  --interact, --interactive   Run in interactive mode.
  -j N, --jobs=N              Allow N jobs at once.
  -k, --keep-going            Keep going when a target can't be made.
  --max-drift=N               Set maximum system clock drift to N seconds.
  --md5-chunksize=N           Set chunk-size for MD5 signature computation to
                                N kilobytes.
  -n, --no-exec, --just-print, --dry-run, --recon
                              Don't build; just print commands.
  --no-site-dir               Don't search or use the usual site_scons dir.
  --profile=FILE              Profile SCons and put results in FILE.
  -q, --question              Don't build; exit status says if up to date.
  -Q                          Suppress "Reading/Building" progress messages.
  --random                    Build dependencies in random order.
  -s, --silent, --quiet       Don't print commands.
  --site-dir=DIR              Use DIR instead of the usual site_scons dir.
  --stack-size=N              Set the stack size of the threads used to run
                                jobs to N kilobytes.
  --taskmastertrace=FILE      Trace Node evaluation to FILE.
  --tree=OPTIONS              Print a dependency tree in various formats: all,
                                derived, prune, status.
  -u, --up, --search-up       Search up directory tree for SConstruct,
                                build targets at or below current directory.
  -U                          Search up directory tree for SConstruct,
                                build Default() targets from local SConscript.
  -v, --version               Print the SCons version number and exit.
  --warn=WARNING-SPEC, --warning=WARNING-SPEC
                              Enable or disable warnings.
  -Y REPOSITORY, --repository=REPOSITORY, --srcdir=REPOSITORY
                              Search REPOSITORY for source and target files.

Local Options:
  -V, --verbose               Print everything to stdout

+ scons --version
SCons by Steven Knight et al.:
    script: v2.3.4, 2014/09/27 12:51:43, by garyo on lubuntu
    engine: v2.3.4, 2014/09/27 12:51:43, by garyo on lubuntu
    engine path: ['/usr/lib/scons/SCons']
Copyright (c) 2001 - 2014 The SCons Foundation

+ scons -v
SCons by Steven Knight et al.:
    script: v2.3.4, 2014/09/27 12:51:43, by garyo on lubuntu
    engine: v2.3.4, 2014/09/27 12:51:43, by garyo on lubuntu
    engine path: ['/usr/lib/scons/SCons']
Copyright (c) 2001 - 2014 The SCons Foundation

+ scons
scons: Reading SConscript files ...
## VERBOSITORY IS OFF ##
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.

+ scons --verbose
scons: Reading SConscript files ...
## VERBOSITORY IS ON  ##
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.

+ scons -V
usage: scons [OPTION] [TARGET] ...

SCons Error: no such option: -V

那么为什么我在传递-V时会收到错误？

Answer 1

SCons多次解析参数列表。你的错误源于第一次传递，甚至在读入SConscripts之前，只允许内置参数...所以你的AddOption()还没有效果。

事实上，添加像＃34; -V＆＃34;这样的简短选项是不可能的。通过SConscript中的AddOption方法。只有很长的选项，例如您的＆＃34; --verbose＆＃34;，不会立即破坏构建。在src/engine/Script/SConsOptions.py中，方法SConsOptionParser._process_long_opt()捕获实际异常，这样在第二次尝试时（在读取所有SConscripts / SConstructs之后）解析可能会成功。

具有AddOption的SCons不捕获所有指定的标志

1 个答案: