c++11 - Mac 上的 gcc 4.7.3 和 gdb 7.6 - 奇怪的步进问题

Question

我最近通过 MacPorts 在我的 OS X 10.7 系统上安装了 GCC 4.7.3 和 GDB 7.6，以便能够编译 C++11 代码。我无法使用 Apple 自制的 clang++ 和 gdb，因为它不允许我正确调试标准模板库代码(例如，如果我取消引用列表迭代器，程序就会崩溃)。

现在，使用新的 GCC/GDB 组合，我在单步执行函数时遇到了一些奇怪的问题。以这个最小的例子为例:

#include <stdio.h>

class A {
public:
    virtual void testMethod() {
        printf("test in A\n");
    }
};

void test(A &a) {
    printf("asdf\n");
    a.testMethod(); // here, stepping works with -std=c++11
}

int main() {
    A a;
    a.testMethod();
    test(a);
    a.testMethod();
    return 0;
}

如果我使用g++ -O0 -ggdb test.cpp编译代码，GDB根本不会进入A::testMethod。我可以通过指定 A::testMethod 内的代码行来设置断点，但不能通过指定方法名称 (b A::testMethod())。

更奇怪的是，如果我使用 g++ -O0 -ggdb -std=c++11 test.cpp 进行编译，如果从 void test() 调用，GDB 就会进入 testMethod >。从主要来说，步进还是不行。但是，现在，我可以通过仅指定方法名称来设置断点。

此外，一旦我在 GDB 中启动程序，我就会收到 GDB 警告，如相关问题中所述。无论我是否指定 -std=c++11 ，这些警告都会出现。

warning: Could not open OSO archive file "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/./gcc/libgcc_eh.a"
warning: Could not open OSO archive file "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/../libsupc++/.libs/libsupc++convenience.a"
warning: Could not open OSO archive file "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/../src/c++11/.libs/libc++11convenience.a"
warning: Could not open OSO archive file "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/../src/c++98/.libs/libc++98convenience.a"
warning: `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility-atomic-c++0x.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility-c++0x.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility-debug_list-2.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility-debug_list.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility-thread-c++0x.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc49/libstdcxx-devel/work/build/x86_64-apple-darwin11/libstdc++-v3/src/.libs/compatibility.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/_muldi3_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/addtf3_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/darwin-64_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/divtf3_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/emutls_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/enable-execute-stack_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/eqtf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/extenddftf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/extendsftf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/extendxftf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/fixtfdi_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/fixtfsi_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/fixtfti_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/fixunstfdi_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/fixunstfsi_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/fixunstfti_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/floatditf_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/floatsitf_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/floattitf_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/floatunditf_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/floatunsitf_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/floatuntitf_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/getf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/letf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/multf3_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/negtf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/subtf3_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/trunctfdf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/trunctfsf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/trunctfxf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/unordtf2_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/unwind-c_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/unwind-dw2-fde-darwin_s.o': can't open to read symbols: No such file or directory.
warning: `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc47/gcc47/work/build/x86_64-apple-darwin11/libgcc/unwind-dw2_s.o': can't open to read symbols: No such file or directory.

我知道以下问题: Debugging Problems , Weird GDB messages , GDB error message , GDB fails on Mountain Lion ,但他们没有帮助我。指定 -gdwarf-2 -gstrict-dwarf 也没有帮助。

-编辑-两种情况下 nm 的输出是相同的:

0000000100001068 s GCC_except_table0
00000001000010c0 S _NXArgc
00000001000010c8 S _NXArgv
                 U __Unwind_Resume
0000000100000e34 T __Z4testR1A
0000000100000eae T __ZN1A10testMethodEv
00000001000010b0 S __ZTI1A
0000000100000f1d S __ZTS1A
0000000100001090 S __ZTV1A
                 U __ZTVN10__cxxabiv117__class_type_infoE
                 U ___gxx_personality_v0
00000001000010d8 S ___progname
0000000100000000 T __mh_execute_header
00000001000010d0 S _environ
                 U _exit
0000000100000e61 T _main
                 U _puts
0000000100001000 s _pvars
                 U dyld_stub_binder
0000000100000df8 T start

有人设法让 GCC 4.7 和一些适用于 OS X Lion 的调试器工作吗？

Answer 1

我尝试像这样编译......它工作正常......您可以尝试单独使用 -g 选项吗？

例如:g++ -g test.cpp -o test