Mac OS X Lion和XCode 4/llvm-g ++-4.2不覆盖代码 [英] No code coverage with Mac OS X Lion and XCode 4 / llvm-g++-4.2

问题描述

其他人报告无法此处和

Other people have reported not being able to generate code coverage with XCode 4, but I find not only can I not do it from within XCode 4, I can't do it even with a simple toy program from the command line. I followed the examples given here and here, which led me to create this cov.c file:

#include <stdio.h>

int main (void) {
  int i;
  for (i = 1; i < 10; i++) {
      if (i % 3 == 0)
        printf("%d is divisible by 3\n", i);
      if (i % 11 == 0)
        printf("%d is divisible by 11\n", i);
  }
  return 0;
}

然后我使用以下命令来尝试产生代码覆盖率:

I then used the following commands in an attempt to generate code coverage:

g++ -c -g -O0 --coverage -o $PWD/obj/cov.o $PWD/cov.c
g++ -g -O0 --coverage -o $PWD/bin/cov $PWD/obj/*.o
$PWD/bin/cov

A，在obj目录中没有cov.gcno文件.实际上，在此之后，我仅有的文件是: 冠状病毒 obj/cov.o bin/cov

Alas, no cov.gcno file exists in the obj directory. In fact, the only files I have after this are: cov.c obj/cov.o bin/cov

此外，如果键入nm bin/cov，则会得到以下信息:

Furthermore, if I type nm bin/cov, I get the following:

0000000100001048 S _NXArgc
0000000100001050 S _NXArgv
0000000100001060 S ___progname
0000000100000000 A __mh_execute_header
0000000100001058 S _environ
                 U _exit
0000000100000e40 T _main
                 U _printf
0000000100001000 s _pvars
                 U dyld_stub_binder
0000000100000e00 T start

这表明libgcov.a从未链接过.如果我替换

This suggests that libgcov.a was never linked in. If I replace

g++ -g -O0 --coverage -o $PWD/bin/cov $PWD/obj/*.o

具有:

g++ -g -O0 --coverage -o $PWD/bin/cov -lgcov $PWD/obj/*.o

我得到完全相同的结果.

I get the exact same results.

更多信息:

• g++ --version产生:"i686-apple-darwin11-llvm-g ++-4.2(GCC)4.2.1 (基于Apple Inc.内部版本5658)(LLVM内部版本2336.1.00)"
• 我也尝试过使用gcc(是llvm-gcc).

• g++ --version yields: "i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)"
• I've also tried using gcc (which is llvm-gcc).

推荐答案

在这个答案.基本上，我将覆盖命令更改为使用clang而不是g++(因为示例文件是纯C的，所以我选择了clang而不是clang++，这已经证明可以与C ++文件一起使用) .从那里，我可以使用lcov生成类似于我以前从Java/cobertura中看到的输出.

I was able to figure out an answer to this question using help from this answer. Basically, I changed my coverage commands to use clang instead of g++ (because the example file was pure C, I went with clang instead of clang++, which I've verified works just fine with C++ files). From there, I was able to use lcov to generate output similar to what I'm used to seeing from Java/cobertura.

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