* Source code coverage of gcc
@ 2018-12-06 14:06 sameeran joshi
2018-12-07 0:00 ` Andi Kleen
0 siblings, 1 reply; 2+ messages in thread
From: sameeran joshi @ 2018-12-06 14:06 UTC (permalink / raw)
To: gcc
Hi,
I have a random C program as a test case, for which I need to do
source code coverage on gcc.
I have used the gcov tool and further the lcov tool. The percentage of
source code coverage which I get after using gcov, Is that the final %
which I need to do gcc source code coverage?
What does it mean to build gcc with -pg option, how does that help in
source code coverage?
Thanks,
Sameeran Joshi
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Source code coverage of gcc
2018-12-06 14:06 Source code coverage of gcc sameeran joshi
@ 2018-12-07 0:00 ` Andi Kleen
0 siblings, 0 replies; 2+ messages in thread
From: Andi Kleen @ 2018-12-07 0:00 UTC (permalink / raw)
To: sameeran joshi; +Cc: gcc
sameeran joshi <gsocsameeran@gmail.com> writes:
> Hi,
> I have a random C program as a test case, for which I need to do
> source code coverage on gcc.
> I have used the gcov tool and further the lcov tool. The percentage of
> source code coverage which I get after using gcov, Is that the final %
> which I need to do gcc source code coverage?
>
> What does it mean to build gcc with -pg option, how does that help in
> source code coverage?
lcov/gcov can only work if the code is instrumented.
So this requires building gcc with BOOT_CFLAGS="-O2 -g -pg"
(see the chapter on building gcc in the manual for more information)
You would then run the instrumented gcc, which writes coverage
data to disk. Then lcov can be used to get a summary of coverage.
-Andi
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