在OS X上使用MacPorts GCC调试问题

Question

对于使用GCC 4.7 MacPorts构建编译的程序,我似乎无法获得可读的调试输出.

我尝试过使用GDB 6.3和GDB 7.3,每个都有自己的问题.

试试GDB 7.3(MacPorts)

使用GDB 7.3,我在启动时获得以下输出:

$ ggdb ./test
GNU gdb (GDB) 7.3
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://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.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin11.4.0".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
BFD: unable to read unknown load command 0x24
BFD: unable to read unknown load command 0x26
BFD: unable to read unknown load command 0x24
BFD: unable to read unknown load command 0x26
Reading symbols from /Users/StackedCrooked/programming/projects/stacked-crooked/Playground/LockOrderChecker/test...Reading symbols from /Users/StackedCrooked/programming/projects/stacked-crooked/Playground/LockOrderChecker/test.dSYM/Contents/Resources/DWARF/test...done.
done.

运行和触发断言会导致堆栈跟踪不可读:

(gdb) r
Starting program: /Users/StackedCrooked/programming/projects/stacked-crooked/Playground/LockOrderChecker/test 
BFD: unable to read unknown load command 0x24
BFD: unable to read unknown load command 0x26
main
Assertion failed: (false), function lock, file main.cpp, line 168.

Program received signal SIGABRT, Aborted.
0x00007fff8ede282a in ?? ()

(gdb) bt
#0  0x00007fff8ede282a in ?? ()
#1  0x00007fff9a273a9c in ?? ()
#2  0x00007fff6af00690 in ?? ()
#3  0x0000003000000030 in ?? ()
#4  0x00007fffffffffdf in ?? ()
#5  0x000000010b305840 in ?? ()
#6  0x00007fff6af006d0 in ?? ()
#7  0x00007fff9a2a65de in ?? ()
#8  0x0000000000000000 in ?? ()

试试GDB 6.3(内置)

根据这个答案,我应该使用GDB 6.3.然而,这会导致一系列不同的问题.在启动过程中,我遇到了一堆错误:

GNU gdb 6.3.50-20050815 (Apple version gdb-1708) (Thu Nov  3 21:59:02 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries .
warning: Could not find object file "/Volumes/work/macports/var/macports/build/_Volumes_work_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility.o" - no debug information available for "../../../../gcc-4.7.1/libstdc++-v3/src/c++98/compatibility.cc".


warning: Could not find object file "/Volumes/work/macports/var/macports/build/_Volumes_work_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility-debug_list.o" - no debug information available for "../../../../gcc-4.7.1/libstdc++-v3/src/c++98/compatibility-debug_list.cc".

warning: Could not find object file "/Volumes/work/macports/var/macports/build/_Volumes_work_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility-debug_list-2.o" - no debug information available for "../../../../gcc-4.7.1/libstdc++-v3/src/c++98/compatibility-debug_list-2.cc".

如果一个断言被触发并且我试图获得回溯,我就会看到这一点:

Assertion failed: (false), function lock, file main.cpp, line 168.

Program received signal SIGABRT, Aborted.
0x00007fff8ede282a in __kill ()
(gdb) bt
#0  0x00007fff8ede282a in __kill ()
#1  0x00007fff9a273a9c in abort ()
#2  0x00007fff9a2a65de in __assert_rtn ()
Die: DW_TAG_unspecified_type (abbrev = 19, offset = 423)
    has children: FALSE
    attributes:
        DW_AT_name (DW_FORM_strp) string: "decltype(nullptr)"
Die: DW_TAG_unspecified_type (abbrev = 19, offset = 423)
    has children: FALSE
    attributes:
        DW_AT_name (DW_FORM_strp) string: "decltype(nullptr)"
Dwarf Error: Cannot find type of die [in module /Users/StackedCrooked/programming/projects/stacked-crooked/Playground/LockOrderChecker/test.dSYM/Contents/Resources/DWARF/test]

根据这个答案(引用GCC 4.5手册),我应该使用这些-gdwarf-2 -gstrict-dwarf选项.

我遵循了这个建议.我的构建命令如下所示:

g++ -o run-test -std=c++0x -Wall -Wextra -Werror -gdwarf-2 -gstrict-dwarf -g2 -O0 -I/opt/local/include main.cpp

但是,它没有解决任何上述问题.

记录:我在OS X Lion上.

有谁知道如何解决这一问题？

Answer 1

根据 g++ 手册页，您应该使用 -ggdb 为 gdb 生成调试符号。顺便说一句，根据我的经验（在 linux、windows (mingw) 和 mac 上），仅使用 -g 总是会为 gdb 生成良好的符号。