问题
I now work on C code coverage study and encountered following issue, GCC version 4.4.6:
- Added compiler flag
CFLAGS = --coverageand linker optionLDFLAGS := --coverageorLOCAL_LDLIBS := --coverageand got the error:
undefined reference to '__gcov_init'" and "undefined reference to '__gcov_merge_add'
- Added option
LOCAL_LDFLAGS := --coverage, and got link error:
libgcov.a(_gcov.o): in function __gcov_set_sampling_rate: undefined reference to '__gcov_sampling_rate'
libgcov.a(_gcov.o): in function gcov_exit: undefined reference to '__gcov_pmu_profile_filename'
libgcov.a(_gcov.o): in function __gcov_init: undefined reference to '__gcov_pmu_profile_options' '__gcov_pmu_top_n_address'
Can anyone help to provide some suggestions on this issue?
回答1:
Try this approach:
Compile the code for which you want to generate the coverage with these options:
CFLAGS: -fprofile-arcs -ftest-coverage
LFLAGS: -lgcov --coverage
If this doesn't solve the problem, then please provide some information on the structure of your application, i.e. whether its single program or an application involving shared/static libraries etc.
Hope that helps!
回答2:
Are you linking with -lgcov? If you are using a Makefile it would be of great help to have a look at it in order to help you.
回答3:
I found I had to put the '-lgcov' to the right of the object being profiled instead of in Flags. Something like. gcc -pg -o myprog myprog.o -lgmp.a -lgcov
回答4:
you have to provide LDFLAGS to resolve this issue.
LDFLAGS += " -lgcov --coverage"
回答5:
I can't be sure which change finally did the trick for me but I think it was the -fprofile-generate flag. Using GNAT GPS I went to the Switches tab on the left and then selected the Ada Linker tab on the top. Then I enabled the checkbox for Code Coverage. Oh yeah I've found that on the Builder tab in that same area if you enable the Recompile if switches changed checkbox it can save a lot of teeth-gnashing. Probably slows things down for the pros but I found it helpful.
来源：https://stackoverflow.com/questions/16682606/how-to-resolve-gcov-init-undefined-reference-issue-when-linking