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I used the lcov to create coverage information in my project. But I only can get line coverage and function coverage statistics information.
lcov version:1.10, gcov version:4.4.5 The commands I used is:
lcov -d $OSPL_HOME/src -d $OSPL_OUTER_HOME/src -c -o /work/li/log/lcov-raw.info lcov -r /work/li/log/lcov-raw.info "*.ll" "*.yy" "*.yy.c" yaccpar "TAO161*" "/usr/include/*" "*/testsuite/*" -o /work/li/log/lcov.info After these two commands, I got the results is:
Deleted 23 files Writing data to /work/li/log/lcov.info Summary coverage rate: lines......: 45.4% (65087 of 143496 lines) functions..: 46.1% (5575 of 12102 functions) **branches...: no data found** So there were no branches coverage results. Why? So what happened? And how can this happen? I am confused here.
After the first command, I got lots of warnings like these:
geninfo: WARNING: cannot find an entry for ..#..#code#accum.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#at.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#autodef.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#copyof.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#debug.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#define.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#dump.c.gcov in .gcno file,skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#error.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#expand.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#expr.c.gcov in .gcno file,skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#if.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#include.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#io.c.gcov in .gcno file, s kipping file! geninfo: WARNING: cannot find an entry for ..#..#code#is.c.gcov in .gcno file, s kipping file! geninfo: WARNING: cannot find an entry for ..#..#code#line.c.gcov in .gcno file,skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#pragma.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#preprocess.c.gcov in .gcnofile, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#set.c.gcov in .gcno file,skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#sharp.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#symtbl.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#undef.c.gcov in .gcno file, skipping file! geninfo: WARNING: cannot find an entry for ..#..#code#while.c.gcov in .gcno file , skipping file! 
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You need to re-enable it by either: editing your ~/. lcovrc file (copied from /etc/lcovrc) to change lcov_branch_coverage setting to 1. adding --rc lcov_branch_coverage=1 to your lcov command lines.
To calculate Branch Coverage, one has to find out the minimum number of paths which will ensure that all the edges are covered. In this case there is no single path which will ensure coverage of all the edges at once. The aim is to cover all possible true/false decisions.
LCOV is a graphical tool for GCC's coverage testing with gcov. It creates HTML pages containing the source code annotated with coverage information by collecting gcov data from multiple source files. LCOV supports “Lines coverage” and “Functions coverage” measurement.
I got the email from Peter Oberparleiter, the author of geninfo. I got the answer as following.
LCOV 1.10 has branch coverage disabled per default. You can enable it by modifying the lcovrc file (see man lcovrc) or by specifying --rc lcov_branch_coverage=1 when running lcov/genhtml.
If you're not using LCOV 1.10 and still don't get branch coverage, it may be that you're version of GCC does not provide this information.
(The above answer was erroneously added to the question by the author.)
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