为什么gcc 4.1 + gcov报告100%分支机构覆盖率和更新(4.4,4.6,4.8)报告“p =新类的50%”;线? [英] Why gcc 4.1 + gcov reports 100% branch coverage and newer (4.4, 4.6, 4.8) reports 50% for "p = new class;" line?
问题描述
当gcc 4.1(使用gcov)下一行时:
p =新类; 已报告
作为100%的分支覆盖范围< - 这对我来说是好的。
为什么使用gcc 4.4及更高版本的同一行报告为:
[+ - ] p = new Class; (50%的分支机构覆盖率)...< - 这是覆盖100%的问题!!!
我可以为更新的gcc版本设置任何额外选项为了报告与gcc 4.1相同的分支覆盖率,单行为p = new Class;。
预先感谢。
解决方案!
我们有一些C / C ++文件有和没有异常处理,所以lcov / gcov进程每个代码块的异常处理。
在一个普通块内,例如:
int main(void)
{
...
...
[+ - ] printf(Hello \\\
);
...
}
gcov报告printf行有一个分支覆盖率为50%--->为什么?
由于异常处理已启用!!!
为了解决这个问题,请指定:
-fno-exceptions
在g ++命令行中。
示例:
g ++ -O0 --coverage -fno-exceptions -fno-inline ....
谢谢!
When gcc 4.1 (using gcov) next line:
p = new Class;
is reported as 100% branch coverage <-- THIS IS OK for me.
Why using gcc 4.4 and higher same line is reportted as:
[+ -] p = new Class; (50% branch coverage)... <-- THIS IS a problem for covering 100% !!!
Can I set any extra options to newer gcc versions in order to report same branch coverage as gcc 4.1 for single lines as "p = new Class;".
Thanks in advance.
Solved !
We have some C/C++ files with and without exceptions handling, so lcov/gcov process "exceptions handling" for each code block.
Inside a normal block, for example:
int main(void)
{
...
...
[+ -] printf("Hello\n");
...
}
gcov reports that printf line has a "branch coverage" of 50% ---> WHY ?
Because exceptions handling is enabled !!!
In order to solve this issue, specify:
-fno-exceptions
in g++ command line.
Example:
g++ -O0 --coverage -fno-exceptions -fno-inline ....
Thanks !
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