mkdir -p /tmp/build &&
cd /tmp/build &&
mkdir -p /tmp/src &&
echo "int main(){return 0;}" > /tmp/src/prog.c &&
gcc --coverage -o prog /tmp/src/prog.c &&
./prog &&
gcovr -v -r .
将输出一个空报告。
Scanning directory . for gcda/gcno files...
Found 2 files (and will process 1)
Processing file: /tmp/build/prog.gcda
Running gcov: 'gcov /tmp/build/prog.gcda --branch-counts --branch-probabilities --preserve-paths --object-directory /tmp/build' in '/tmp/build'
Finding source file corresponding to a gcov data file
currdir /tmp/build
gcov_fname #tmp#src#prog.c.gcov
[' -', ' 0', 'Source', '/tmp/src/prog.c\n']
source_fname /tmp/build/prog.gcda
root /tmp/build
fname /tmp/src/prog.c
Parsing coverage data for file /tmp/src/prog.c
Filtering coverage data for file /tmp/src/prog.c
Gathered coveraged data for 0 files
------------------------------------------------------------------------------
GCC Code Coverage Report
Directory: .
------------------------------------------------------------------------------
File Lines Exec Cover Missing
------------------------------------------------------------------------------
------------------------------------------------------------------------------
TOTAL 0 0 --%
------------------------------------------------------------------------------
然而,如果我手动运行
gcov /tmp/build/prog.gcda --branch-counts --branch-probabilities --preserve-paths --object-directory /tmp/build
我获得了正确的结果
File '/tmp/src/prog.c'
Lines executed:100.00% of 1
No branches
No calls
Creating '#tmp#src#prog.c.gcov'
似乎
gcovr
无法从正确的gcov
输出中提取覆盖率。当源文件位于当前目录之外(与构建目录、输出目录、运行目录相同),且使用绝对路径调用gcc
时才会出现这种情况。如何解决?
编辑
针对相对路径,在上游的
gcovr
中已经修复,但绝对路径仍然存在错误。请参见https://github.com/gcovr/gcovr/issues/169。
mkdir
。解释对象和源文件放置的位置。 - Vikas Tawniya