Question

我正在尝试使用Eigen对象上的条件断点使用GDB进行调试。例如，当向量中的任何值都不为零时，我想中断。我会在GDB中这样做：

break cpp/File.cpp:143 if (v != 0).any()

但是，这不起作用。 GDB给出了这一点：

Could not find operator!=

即使这是完全有效的语法。而且，条件断点如

break cpp/File.cpp:143 if v[0] != 0

在GDB中出现此错误：

Error in testing breakpoint condition:
Couldn't get registers: No such process.
An error occurred while in a function called from GDB.
Evaluation of the expression containing the function
(Eigen::DenseCoeffsBase<Eigen::Array<int, 3, 1, 0, 3, 1>, 1>::operator[](long)) will be abandoned.
When the function is done executing, GDB will silently stop.

该代码是使用-O0 -g -fno-inline编译的。如何调试本征对象的内容？

Answer 1

According to this question, (sometimes) GDB seems to have problems with overloaded operators. You could try one of these alternatives:

if (! v.isZero())

if (! v.cwiseEqual(0).all())

And instead of if v[0] != 0 you could try one of these:

 if (v.data()[0] != 0)

 if (v.coeff(0) != 0)

条件断点失败的GDB特征调试

1 个答案: