lcov: a graphical GCOV front-end
Gcov is a test coverage program. Use it in concert with GCC to analyze your programs to help create more efficient, faster running code and to discover untested parts of your program. You can use gcov as a profiling tool to help discover where your optimization efforts will best affect your code. I don't think the test has ever passed on Darwin. FAIL: g.dg/gcov/pr16855.C -std=gnu14 line 21: is #####:should be 1 FAIL: g.dg/gcov/pr16855.C -std=gnu14 line 45: is #####:should be 1 (and corresponding fails on other std versions) The analysis is this: Darwin.does. run the DTORs, but they run before the profile DTORs, and therefore are not recorded in the output.
Gcov is GNU's tool for code coverage. It makes use of graph files (.gcno files) generated when compiled with the -coverage option. However, this option does not exist for Apple's llvm-gcc compiler which means that.gcno files cannot be generated. To solve this, compile exactly the same way but with clang instead of llvm-gcc to generate the. Browse other questions tagged linker undefined-reference gcov or ask your own question. The Overflow Blog Podcast 293: Connecting apps, data, and the cloud with Apollo GraphQL CEO. Using $ gcov -version Apple LLVM version 9.0.0 (clang-900.0.38) Optimized build. Default target: x8664-apple-darwin16.7.0 Host CPU: sandybridge geninfo seems to parse this output in a way that causes lcov to think this the equivalent o.
Command to display lcov manual in Linux: $ man 1 lcov
NAME
lcov - a graphical GCOV front-endSYNOPSIS
lcov-c|--capture
[-d|--directorydirectory][--no-recursion][-f|--follow]
[-q|--quiet]
lcov-l|--listtracefile
[-o|--output-filetracefile][--checksum][--no-checksum]
[-q|--quiet][--config-fileconfig-file][--rckeyword=value]
lcov-e|--extracttracefile pattern
[-o|--output-filetracefile][--checksum][--no-checksum]
[-q|--quiet][--config-fileconfig-file][--rckeyword=value]
lcov--difftracefile diff
[-q|--quiet]
lcov[-h|--help][-v|--version]
Uselcovto collect coverage data andgenhtmlto create HTML pages. Coverage data can either be collected from thecurrently running Linux kernel or from a user space application. To do this,you have to complete the following preparation steps:
For Linux kernel coverage:
- Compile the application with GCC using the options'-fprofile-arcs' and '-ftest-coverage'.
Please note that this man page refers to the output format oflcovas '.info file' or 'tracefile' and that the output of GCOVis called '.da file'.
Also note that when printing percentages, 0% and 100% are only printed whenthe values are exactly 0% and 100% respectively. Other values which wouldconventionally be rounded to 0% or 100% are instead printed as nearestnon-boundary value. This behavior is in accordance with that of thegcov(1)tool.
OPTIONS
-atracefile
--add-tracefiletracefile
Specify several tracefiles using the -a switch to combine the coverage datacontained in these files by adding up execution counts for matching test andfilename combinations.
The result of the add operation will be written to stdout or the tracefilespecified with -o.
Only one of -z, -c, -a, -e, -r, -l, --diff or --summary may bespecified at a time.
-bdirectory
--base-directorydirectory
Use this option to specify the base directory of a build-environmentwhen lcov produces error messages like:
--compatmode=value[,mode=value,..]
Use --compat to specify that lcov should enable one or more compatibilitymodes when capturing coverage data. You can provide a comma-separated listof mode=value pairs to specify the values for multiple modes.
Validvaluesare:
on
- Disable compatibility mode.
Validmodesare:
libtool
Enable this mode if you are capturing coverage data for a project thatwas built using the libtool mechanism. See also--compat-libtool.The default value for this setting is 'on'.
hammerEnable this mode if you are capturing coverage data for a project thatwas built using a version of GCC 3.3 that contains a modification(hammer patch) of later GCC versions. You can identify a modified GCC 3.3by checking the build directory of your project for files ending in theextension '.bbg'. Unmodified versions of GCC 3.3 name these files '.bb'.The default value for this setting is 'auto'.
split_crcEnable this mode if you are capturing coverage data for a project thatwas built using a version of GCC 4.6 that contains a modification(split function checksums) of later GCC versions. Typical error messageswhen running lcov on coverage data produced by such GCC versions are'out of memory' and 'reached unexpected end of file'.The default value for this setting is 'auto'
--compat-libtool
--no-compat-libtool
Use --compat-libtool to enable libtool compatibility mode or --no-compat-libtoolto disable it. The libtool compatibility mode isenabledby default.
When libtool compatibility mode is enabled, lcov will assume that the sourcecode relating to a .da file located in a directory named '.libs' can befound in its parent directory.
If you have directories named '.libs' in your build environment but don't uselibtool, disable this option to prevent problems when capturing coverage data.
--config-fileconfig-file
When this option is specified, neither the system-wide configuration file/etc/lcovrc, nor the per-user configuration file ~/.lcovrc is read.
This option may be useful when there is a need to run severalinstances oflcovwith different configuration file options in parallel.
--convert-filenames
Use this option together with --diff to rename the file names of processeddata sets according to the data provided by the diff.
--difftracefiledifffile
Use this option if you want to merge coverage data from different source codelevels of a program, e.g. when you have data taken from an older versionand want to combine it with data from a more current version.lcovwill try to map source code lines between those versions and adjust the coveragedata respectively.difffileneeds to be in unified format, i.e. it has to be created using the '-u' optionof thedifftool.
Note that lines which are not present in the old version will not be countedas instrumented, therefore tracefiles resulting from this operation shouldnot be interpreted individually but together with other tracefiles takenfrom the newer version. Also keep in mind that converted coverage data shouldonly be used for overview purposes as the process itself introduces a lossof accuracy.
The result of the diff operation will be written to stdout or the tracefilespecified with -o.
Only one of -z, -c, -a, -e, -r, -l, --diff or --summary may bespecified at a time.
-ddirectory
--directorydirectory
If you want to work on coverage data for a user space program, use thisoption to specify the location where the program was compiled (that'swhere the counter files ending with .da will be stored).
Mac os x 10.0 download. Note that you may specify this option more than once.
--external
--no-external
External source files are files which are not located in one of the directoriesspecified by --directory or --base-directory. Use --external to includeexternal source files while capturing coverage data or --no-external toignore this data.
Data for external source files isincludedby default.
-etracefilepattern
--extracttracefilepattern
Use this switch if you want to extract coverage data for only a particularset of files from a tracefile. Additional command line parameters will beinterpreted as shell wildcard patterns (note that they may need to beescaped accordingly to prevent the shell from expanding them first).Every file entry intracefilewhich matches at least one of those patterns will be extracted.
The result of the extract operation will be written to stdout or the tracefilespecified with -o.
Only one of -z, -c, -a, -e, -r, -l, --diff or --summary may bespecified at a time.
-f
--follow
- Specify the location of the gcov tool.
-h
--help
Recommended procedure when capturing data for a test case:
1. create baseline coverage data file
- # appdir/test
- # lcov -a app_base.info -a app_test.info -o app_total.info
-ksubdirectory
--kernel-directorysubdirectory
Use this option if you don't want to get coverage data for all of thekernel, but only for specific subdirectories. This option may be specifiedmore than once.
Note that you may need to specify the full path to the kernel subdirectorydepending on the version of the kernel gcov support.
-ltracefile
--listtracefile
Only one of -z, -c, -a, -e, -r, -l, --diff or --summary may bespecified at a time.
--list-full-path
--no-list-full-path
Use --list-full-path to show full paths during list operationor --no-list-full-path to show shortened paths. Paths areshortenedby default.
--no-markers
- Use this option if you want to get coverage data for the specified directoryonly without processing subdirectories.
-otracefile
--output-filetracefile
Specify '-' as a filename to use the standard output.
By convention, lcov-generated coverage data files are called 'tracefiles' andshould have the filename extension '.info'.
--pathpath
Use this option together with --diff to tell lcov to disregard the specifiedinitial path component when matching between tracefile and diff filenames.
-q
--quiet
This option is implied when no output filename is specified to preventprogress messages to mess with coverage data which is also printed tothe standard output.
--rckeyword=value
Use this option to specify akeyword=valuestatement which overrides the corresponding configuration statement inthe lcovrc configuration file. You can specify this option more than onceto override multiple configuration statements.Seelcovrc(5)for a list of available keywords and their meaning.
-rtracefilepattern
--removetracefilepattern
Use this switch if you want to remove coverage data for a particularset of files from a tracefile. Additional command line parameters will beinterpreted as shell wildcard patterns (note that they may need to beescaped accordingly to prevent the shell from expanding them first).Every file entry intracefilewhich matches at least one of those patterns will be removed.
The user will see a list of their system's PCI-E slots and any devices installed in them. If a device supports ECC, the user will be able to check the Enable Error Correcting Codes box next to the list. Video card for mac pro nvidia gtx 680 4gb early 2008 2013 bmw. If the user switches between drivers, they must click the Restart button for changes to take effect.ECC TAB: Within this tab, the user can enable or disable ECC functionality on supported graphics cards. Once the user makes changes to ECC, they will be required to restart the system.NOTE: Currently, the only NVIDIA graphics card that supports ECC functionality is the NVIDIA Quadro K5000 for Mac. If the device does not support ECC then the box will be grayed out.
The result of the remove operation will be written to stdout or the tracefilespecified with -o.
Only one of -z, -c, -a, -e, -r, -l, --diff or --summary may bespecified at a time.
--stripdepth
Use this option together with --diff to tell lcov to disregard the specifiednumber of initial directories when matching tracefile and diff filenames.
--summarytracefile
Note that you may specify this option more than once.
Only one of -z, -c, -a, -e, -r, -l, --diff or --summary may bespecified at a time.
-ttestname
--test-nametestname
This name identifies a coverage data set when more than one data set is mergedinto a combined tracefile (see option -a).
Valid test names can consist of letters, decimal digits and the underscorecharacter ('_').
--to-packagepackage
Use this option if you have separate machines for build and test andwant to perform the .info file creation on the build machine. To do this,follow these steps:
On the test machine:
- run lcov -c --from-packagefile[-o and other options]
This works for both kernel and user space coverage data. Note that you mighthave to specify the path to the build directory using -b witheither --to-package or --from-package. Note also that the package datamust be converted to a .info file before recompiling the program or it willbecome invalid.
-v
--version
- The system-wide configuration file.
~/.lcovrc
