c++ - mac pretty-print gdb

Question

我在macOS High Sierra 10.13.6上，无法将gdb转换为 pretty-print 容器或字符串。我按照这里GDB 7.6 STL pretty print with gcc-4.8 and mac os 10.9的说明进行操作，克隆了gdb pretty-print ，并将路径添加到.gdbinit。但是gdb仍然不会打印出来。我在启动gdb之后添加了 pretty-print ，以确保它们已注册

(gdb) python
>import sys
>sys.path.insert(0, '/Users/liamadams/Documents/gdb/python')
>from libstdcxx.v6.printers import register_libstdcxx_printers
>register_libstdcxx_printers (None)
>end
Traceback (most recent call last):
  File "<string>", line 4, in <module>
  File "/Users/liamadams/Documents/gdb/python/libstdcxx/v6/printers.py", line 1739, in register_libstdcxx_printers
    gdb.printing.register_pretty_printer(obj, libstdcxx_printer)
  File "/usr/local/Cellar/gdb/8.0.1/share/gdb/python/gdb/printing.py", line 152, in register_pretty_printer
    printer.name)
RuntimeError: pretty-printer already registered: libstdc++-v6

gdb正在注册 pretty-print ，我正在运行gcc 8.2.0和gdb 8.0.1。注册的 pretty-print 是c++-v6，应该是v8吗？我克隆了这个仓库来获得 pretty-print svn://gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/python
我使用 /usr/local/Cellar/gcc/8.2.0/bin/g++-8 -static-libstdc++ -g -o a.out b.o c.o -pthread构建了代码

这是尝试打印字符串时的gdb输出

(gdb) p currentItem
$1 = {static npos = <optimized out>, 
  _M_dataplus = {<allocator<char>> = {<new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7ffeefbff900 "mining"}, _M_string_length = 6, {
    _M_local_buf = "mining\000\000\v\000\000\000\000\000\000", 
    _M_allocated_capacity = 113723912907117}}

(gdb) whatis currentItem
type = string

Answer 1

这似乎是一个错误。此堆栈溢出问题中提供了一个黑客解决方案:
Bug in gdb libstdc++ pretty-printers with gcc 8 installed from macports (macOS)
从该问题复制，您需要修改 pretty-print 代码:

--- python/libstdcxx/v6/printers.py.old 2018-10-13 13:57:11.000000000 +0300
+++ python/libstdcxx/v6/printers.py 2018-10-13 14:35:55.000000000 +0300
@@ -1306,2 +1306,4 @@
     def add(self, name, function):
+        if (name.startswith('std::')):
+            self.add(name[5:], function)
         # A small sanity check.