With the mentioned tools it's easy to spot template code that wasn't instantiated with the test cases at all, since it has NO annotations. Sample code TemplateSampleTest. I stumbled across this problem too and unfortunately didn't have much luck with the various flags mentioned, I did, however, discover two ways to generate more accurate coverage information when dealing with header-only functions.
I wound up getting link errors because certain functions that should have been removed by the linker were not e. This attribute, attached to a function, means that code must be emitted for the function even if it appears that the function is not referenced.
Since I found this question super useful in setting up test coverage for my header-only library, here are some additional things I learned in hopes they can help others:. Even with all of the flags mentioned in these answers, I was still having problems with unused class methods getting optimized out. After much experimenting, I found that clang source based coverage these flags: -fprofile-instr-generate -fcoverage-mapping includes all class methods and is in general the most reliable way of getting coverage data.
I also use the flags: -O0 -fno-inline -fno-elide-constructors to further reduce the risk of code getting optimized out. For a large library, the template instantiation thing is still a problem. Explicitly instantiating them is all well and good, but if anyone ever forgets to, you'll get inaccurate code coverage metrics. See my answer to this question for an approach to automatically adjusting code coverage data to account for this. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Getting useful GCov results for header-only libraries Ask Question. Asked 9 years, 10 months ago. Active 2 years, 5 months ago. Viewed 10k times. For example, if the header file x. This can be useful if x. Specify either the directory containing the gcov data files, or the object path name. If a directory is specified, the data files are in that directory and named after the input file name, without its extension. If a file is specified here, the data files are named after that file, without its extension.
Preserve complete path information in the names of generated. Without this option, just the filename component is used. This is useful if sourcefiles are in several different directories. Emit perf-like colored output for hot lines. Legend of the color scale is printed at the very beginning of the output file. Only output information about source files with a relative pathname after source prefix elision. Absolute paths are usually system header files and coverage of any inline functions therein is normally uninteresting.
A prefix for source file names to remove when generating the output coverage files. This option is useful when building in a separate directory, and the pathname to the source directory is not wanted when determining the output file names. Note that this prefix detection is applied before determining whether the source file is absolute. When branch probabilities are given, include those of unconditional branches. Unconditional branches are normally not interesting. Display the gcov version number on the standard output , and exit without doing any further processing.
When using —preserve-paths , gcov uses the full pathname of the source files to create an output filename. This can lead to long filenames that can overflow filesystem limits. This option creates names of the form source-file md5.
The option is an alternative to the —preserve-paths on systems which have a filesystem limit. Otherwise it will not be able to locate the source files. These contain the coverage information of the source file they correspond to. Refer to those options for details. If you invoke gcov with multiple input files, the contributions from each input file are summed.
Typically you would invoke it with the same list of files as the final link of your executable. The gcovr command can also generate a JSON output using the --json and --json-pretty options:. The --json-pretty option generates an indented JSON output that is easier to read. Structure of file is based on gcov JSON intermediate format with additional key names specific to gcovr.
If you just need a summary of the coverage information, similar to the tabulated text based output, you can use --json-summary instead. Multiple JSON files can be merged into the coverage data with sum of lines and branches execution.
The --json-summary option output coverage summary in a machine-readable format for additional post processing. The format is identical to JSON output --json option without detailed lines information.
The --json-summary-pretty option generates an indented JSON summary output that is easier to read. The --csv option output comma-separated values summarizing the coverage of each file. If you are using Coveralls, you can get a coverage report in a suitable JSON format via the --coveralls option:.
The --coveralls-pretty option generates an indented JSON output that is easier to read. Keep in mind that the output contains the checksums of the source files.
If you are using different OSes, the line endings shall be the same. You can write multiple report formats with one gcovr invocation by passing the output filename directly to the report format flag. Note that --html-details overrides any value of --html if it is present.
For each run, generate JSON output :. With this option you have to place your pathnames with wildcards in double quotation marks:. The gcovr command recursively searches a directory tree to find gcov coverage files, and generates a text summary of the code coverage. Search these directories for coverage files. Defaults to --root and --object-directory.
Config key: search-path. The root directory of your source files. File names are reported relative to this root. The --root is the default --filter. Combine the coverage data from JSON files. Coverage files contains source files structure relative to root directory. Those structures are combined in the output relative to the current root directory.
Unix style wildcards can be used to add the pathnames matching a specified pattern. In this case pattern must be set in double quotation marks. Option can be specified multiple times. When option is used gcov is not run to collect the new coverage data. Exit with a status of 2 if the total line coverage is less than MIN.
Exit with a status of 4 if the total branch coverage is less than MIN. Report the branch coverage instead of the line coverage. For text report only. Config key: txt-branch. Add annotated source code reports to the HTML report.
Implies --html. Use syntax highlighting in HTML details page. Enabled by default. Negation: --no-html-details-syntax-highlighting. Default is HIGH has to be greater than or equal to value of --html-medium-threshold.
If HIGH is equal to value of --html-medium-threshold the report has only high and low coverage. Self-contained reports can be sent via email, but conflict with the Content Security Policy of some web servers. Defaults to self-contained reports unless --html-details is used. Negation: --no-html-self-contained.
This is in addition to other reports. Default: False. Generate sonarqube generic coverage report in this file name. Generate Coveralls API coverage report in this file name. Filters decide which files are included in the report. Any filter must match, and no exclude filter must match. A filter is a regular expression that matches a path. Filter paths use forward slashes, even on Windows.
If the filter looks like an absolute path it is matched against an absolute path. Otherwise, the filter is matched against a relative path, where that path is relative to the current directory or if defined in a configuration file to the directory of the file. Keep only source files that match this filter. Can be specified multiple times. Relative filters are relative to the current working directory or if defined in a configuration file.
If no filters are provided, defaults to --root. Exclude directories that match this regex while searching raw coverage files. The gcno files are generated by the compiler.
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