gcov符号在哪里？ [英] Where are the gcov symbols?

问题描述

  gcc AllTests.o CuTestTest 
 
我试图用gcov编译一个简单的应用程序，并得到以下链接错误： .o CuTest.o -o TestTest 
 AllTests.o：在'全局构造函数键入0_RunAllTests'：
 /home/p7539c/cutest/AllTests.c:26：未定义的引用'__gcov_init'
 AllTests.o :(。data + 0x44）：未定义引用`__gcov_merge_add'
 CuTestTest.o：在函数'keyed to 0_TestCuStringNew'的全局构造函数中：
 / home / p7539c / cutest / CuTestTest .c：30：对`__gcov_init'的未定义引用
 CuTestTest.o :(。data + 0x64）：对`__gcov_merge_add'的未定义引用
 CuTest.o：在函数中`全局构造函数被键入0_CuStrAlloc'： 
 /home/p7539c/cutest/CuTest.c:379：未定义引用`__gcov_init'
 CuTest.o :(。data + 0x184）：未定义引用`__gcov_merge_add'
 collect2： ld返回1退出状态
 make：*** [TestTest]错误1 
  

我可以似乎找不到位置缺失的符号的重刑。运行gcc版本4.1.2的机器上存在gcov

有什么想法？感谢。

关于编辑：

使用gcov与一个由一个应用程序组成的应用程序似乎一切正常.c文件。当我有多个.c文件（因此有多个.o文件）时，我遇到了上述问题。

编译步骤如下所示：

  cc -fprofile-arcs -ftest-coverage -g -c -o AllTests.o AllTests.c 
 cc -fprofile-arcs -ftest- coverage -g -c -o CuTestTest.o CuTestTest.c 
 cc -fprofile-arcs -ftest-coverage -g -c -o CuTest.o CuTest.c 
  

解决方案

我只花了大量的时间来调试非常类似的错误。以下是我所学到的：

• 您必须通过 -fprofile-arcs -ftest-coverage 在编译时。


• 链接时必须传递 -fprofile-arcs 。
  

• 链接时仍然会出现奇怪的链接器错误。它们看起来像这样：
  $ b $ p $ lib $ .c（objfile.o）:( .ctors + 0x0）：'全局构造函数的未定义引用keying to long_name_of_file_and_function'

这意味着gconv与其中一个编译器 - 生成的构造函数（在我的情况下，复制构造函数）。检查错误消息中提到的函数，查看它复制哪些对象 - 构造，并查看是否有任何这些类没有复制构造函数。添加一个，错误将消失。

编辑：您是否优化也会影响这一点。尝试打开/关闭优化，如果您遇到问题。

I'm trying to compile a simple app with gcov and getting the following link errors:

gcc AllTests.o CuTestTest.o CuTest.o -o TestTest
AllTests.o: In function `global constructors keyed to 0_RunAllTests':
/home/p7539c/cutest/AllTests.c:26: undefined reference to `__gcov_init'
AllTests.o:(.data+0x44): undefined reference to `__gcov_merge_add'
CuTestTest.o: In function `global constructors keyed to 0_TestCuStringNew':
/home/p7539c/cutest/CuTestTest.c:30: undefined reference to `__gcov_init'
CuTestTest.o:(.data+0x64): undefined reference to `__gcov_merge_add'
CuTest.o: In function `global constructors keyed to 0_CuStrAlloc':
/home/p7539c/cutest/CuTest.c:379: undefined reference to `__gcov_init'
CuTest.o:(.data+0x184): undefined reference to `__gcov_merge_add'
collect2: ld returned 1 exit status
make: *** [TestTest] Error 1

I can't seem to find the location of the missing symbols. gcov is present on the machine running gcc version 4.1.2

Any ideas? Thanks.

On Edit:

Everything seems to work fine when using gcov with an application that consists of one .c file. When I have multiple .c files (hence multiple .o files) I have the above problem.

The compile steps look like the following:

cc -fprofile-arcs -ftest-coverage -g   -c -o AllTests.o AllTests.c
cc -fprofile-arcs -ftest-coverage -g   -c -o CuTestTest.o CuTestTest.c
cc -fprofile-arcs -ftest-coverage -g   -c -o CuTest.o CuTest.c

解决方案

I just spent an incredible amount of time debugging a very similar error. Here's what I learned:

• You have to pass -fprofile-arcs -ftest-coverage when compiling.
• You have to pass -fprofile-arcs when linking.

• You can still get weird linker errors when linking. They'll look like this:

  libname.a(objfile.o):(.ctors+0x0): undefined reference to 'global constructors keyed to long_name_of_file_and_function'

This means that gconv's having problem with one of your compiler-generated constructors (in my case, a copy-constructor). Check the function mentioned in the error message, see what kinds of objects it copy-constructs, and see if any of those classes doesn't have a copy constructor. Add one, and the error will go away.

Edit: Whether or not you optimize can also affect this. Try turning on / switching off optimizations if you're having problems with it.

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