我的configuration.ac文件中的以下代码不起作用(请注意嵌套方括号[default = no])：
AC_ARG_ENABLE(debug,[ --enable-debug build with debugging support [default=no].],[DEBUG="$enableval"],[DEBUG="no"] )
我怎么能逃脱这些括号？
找到了！从
this教程：
M4 arguments are quoted with [ and ]. There is NO WAY to escape these,however,you have several options if you wish to insert [‘s or ]’s:
- Use a `Quadrigaph’. @<:@ gives you [ and @:>@ gives you ].
- Balance your quotes. M4 will turn [[]] in to []. Beware of using this in arguments to macros. Sometimes,you need to double quote as well ([[[]]]).
- Change the quoting using: changequote(<<,>>) to change the quoting to << and >>. The autoconf documentation (rightly,in my opinion) warns against the (over) use of this,since it can lead to unexpected results.
- Avoid [ and ] where ever possible. This is my personal choice.
因此,我的新代码是：
AC_ARG_ENABLE(debug,AS_HELP_STRING(
[--enable-debug],[build with debugging symbols @<:@default=no@:>@]),[enable_debug="$enableval"],[enable_debug="no"]
)
