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为什么 GNU‘bc’ 有这么长的版权字符串？

tag-icon • tag-icon bc gpl
为什么 GNU‘bc’ 有这么长的版权字符串？

当您在 GNU 系统上运行“bc”时，它会打印出以下文本：

~$ bc
bc 1.07.1
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.

与其他几个 GNU 实用程序相比：

~$ gcc --version
gcc (Debian 8.3.0-6) 8.3.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

和

~$ grep --version
grep (GNU grep) 3.3
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

和

~$ ls --version
ls (GNU coreutils) 8.30
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

bc 以这种方式列出所有版权日期而不是仅使用“Copyright 2017 Free Software Foundation, Inc.”是否有任何原因？

答案1

bc如下GNU 推荐的版权声明做法，其中涉及列出每个出版年份，尽管此处的版权声明列出的年份比看到的bc版本（甚至包括dc版本）要多。

其他工具仅列出上次发布的年份，使用gnulib的version_etc函数它只打印 gnulib 中最后更新的年份。

也可以看看项目活跃期间，版权声明必须定期更新吗？

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