macos gcov：无法打开图形文件
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gcov: cannot open graph file
提问by Caleb Poucher
I am trying to use gcov. I have this simple file a.c:
我正在尝试使用 gcov。我有这个简单的文件 ac：
int main() {
return 0;
}
So I do
所以我做
gcc -fprofile-arcs -ftest-coverage a.c -o a
./a
gcov a.c
and I get
我得到
a.gcno:cannot open graph file
Am I doing something wrong? I'm under Mac OS X Lion.
难道我做错了什么？我在 Mac OS X Lion 下。
回答by Steve Atkins
By default on Lion, "gcc" is not gcc. It's LLVM. And it doesn't support generating test coverage data.
在 Lion 上，默认情况下，“gcc”不是 gcc。这是 LLVM。并且它不支持生成测试覆盖率数据。
If you run gcc-4.2 -fprofile-arcs -ftest-coverage a.c -o ainstead that will use a real gcc, and it'll probably work.
如果你运行gcc-4.2 -fprofile-arcs -ftest-coverage a.c -o a，那将使用真正的 gcc，它可能会工作。
回答by Ben Hocking
Try using clanginstead of gcc. I had the same problem, and using clangfixed it for me.
尝试使用clang而不是gcc. 我遇到了同样的问题，并clang为我修复了它。
回答by nmat
Are you sure you are running the command from the same directory as the source file? You must be in the same directory, unless you specify the -o flag. Try:
您确定从与源文件相同的目录运行命令吗？您必须在同一目录中，除非您指定 -o 标志。尝试：
gcov -o a.c
回答by zbeekman
Often this happens when the version of gcovyou're running doesn't match the version of GCC used to compile the application. On some systems, package managers have odd practices in how they link GCC and gcov. For example on many systems gfortranis the same as gfortran-5but gcovmight be something old and crusty.
当gcov您运行的版本与用于编译应用程序的 GCC 版本不匹配时，通常会发生这种情况。在某些系统上，包管理器在如何链接 GCC 和gcov. 例如，在许多系统上gfortran是相同的，gfortran-5但gcov可能是旧的和硬皮的。
回答by 0x90
I used the following on Mac 10.8.4:
我使用了以下内容Mac 10.8.4：
- Installed via xcode the command line tools:
- 通过 xcode 安装命令行工具：
wrote this examplecode from the gcc website:
#include <stdio.h> main() { int i, total; total = 0; for (i = 0; i < 10; i++) total += i; if (total != 45) printf ("Failure\n"); else printf ("Success\n"); }Compiling using the real GCC
gcc-mp-4.7 -fprofile-arcs -ftest-coverage tmp.cAnd using GCC's gcov:
gcov-mp-4.7 -b tmp.cwill give you this output:File 'tmp.c' Lines executed:87.50% of 8 Branches executed:100.00% of 4 Taken at least once:75.00% of 4 Calls executed:50.00% of 2 Creating 'tmp.c.gcov'
从 gcc 网站写了这个示例代码：
#include <stdio.h> main() { int i, total; total = 0; for (i = 0; i < 10; i++) total += i; if (total != 45) printf ("Failure\n"); else printf ("Success\n"); }使用真正的 GCC 编译
gcc-mp-4.7 -fprofile-arcs -ftest-coverage tmp.c并使用 GCC 的 gcov:
gcov-mp-4.7 -b tmp.c会给你这个输出：File 'tmp.c' Lines executed:87.50% of 8 Branches executed:100.00% of 4 Taken at least once:75.00% of 4 Calls executed:50.00% of 2 Creating 'tmp.c.gcov'
