LLDB为什么不能评估此表达式? [英] Why can't LLDB evaluate this expression?

问题描述

LLDB不能处理这些语句中的任何一个...为什么它不能拿出NSString结果并将其打印出来

Neither one of these statements can be processed by LLDB... why is it unable to come up with the NSString result and print it out

expr -o -- [NSString stringWithFormat:@"%@", @"Wow this doesnt work??"]

po [NSString stringWithFormat:@"%@", @"Wow this doesnt work??"]

推荐答案

lldb中的 expression 命令似乎通常无法使用 可变参数列表.即使使用简单的C函数，它也会失败:

It seems that the expression command in lldb can generally not evaluate functions with variable argument lists. It fails even with a simple C function:

int foo(char *msg, ...)
{
    return 17;
}

(lldb) expr foo("bar")
(int) $2 = 17

(lldb) expr foo("bar", 2)
error: no matching function for call to 'foo'
note: candidate function not viable: requires 1 argument, but 2 were provided
error: 1 errors parsing expression

所以这看起来像是lldb中的错误(或没有功能).

So this looks like a bug (or non-feature) in lldb.

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