为什么gcov将类的函数定义报告为不可执行？

问题描述

似乎gcov没有报告类方法作为可执行行的内联定义。示例：

It seems like gcov does not report inline definitions of class methods as executable lines. Example:

#include <iostream>

struct Foo {
  void bar() {}
  void baz() {}
};

int main() {
  Foo foo;
  foo.bar();
}

如果我使用 g ++ -g -O0 -ftest-coverage -fprofile-arcs -o main main.cpp ，运行它，并调用gcov就可以了，我得到以下报告：

If I compile the above program with g++ -g -O0 -ftest-coverage -fprofile-arcs -o main main.cpp, run it, and call gcov on it, I get the following report:

        -:    0:Source:main.cpp
        -:    0:Graph:main.gcno
        -:    0:Data:main.gcda
        -:    0:Runs:1
        -:    0:Programs:1
        -:    1:#include <iostream>
        -:    2:
        -:    3:struct Foo {
        1:    4:  void bar() {}
        -:    5:  void baz() {}
        -:    6:};
        -:    7:
        1:    8:int main() {
        -:    9:  Foo foo;
        1:   10:  foo.bar();
        4:   11:}

为什么第5行被报告为不可执行，上面的方法是否正确报告执行一次？

Why is line 5 reported as non-executable, even though the method above was reported correctly as executed once?

更新

根据gcov文档（）， - 表示不可执行行，而 ##### 和<$

According to the gcov documentation (https://gcc.gnu.org/onlinedocs/gcc/Invoking-Gcov.html#Invoking-Gcov), - denotes a non-executable line while ##### and ==== mark lines that can be executed but weren't.

推荐答案

gcov报告链接您的二进制文件后，从未有任何可能执行 Foo :: baz（）。

gcov is reporting that after linking your binary, there was never any possibility of Foo::baz() being executed.

链接器完全删除了该函数，因此没有可执行文件是与该行关联的代码。

The linker completely removed that function, so no executable was code associated with that line anymore.

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