CODEWITHSUNDEEP
ccode-coverageclanggcov
Chris Bolton
Chris Bolton

Reputation: 2926

gcov out of memory / mismatched version?

Just trying to get gcov up and running, getting the following error:

$ gcov src/main.c -o build
build/main.gcno:version '404*', prefer '407*'

gcov: out of memory allocating 14819216480 bytes after a total of 135168 bytes

I'm using clang/profile_rt to generate the files gcov needs, I'm assuming that might have something to do with it. It's working on my other computer, though, so I assume it can be fixed somehow.

Upvotes: 24

Views: 21486

Answers (4)

Mark Kahn
Mark Kahn

Reputation: 1158

  1. Running gcov with -v flag you can get the exact execution gcov command. It may help to understand what happens.
  2. In my case, specifying gcov version helped to solve the issue: gcovr --gcov-executable gcov-7

Upvotes: 0

anthony sottile
anthony sottile

Reputation: 70348

I just had the same problem on my machine.

Make sure your versions of gcov and the compiler you use match.

I had this exact problem when compiling with g++-4.7 and I had gcov 4.6.

On my machine sudo apt-get install ggcov got me the latest version. I then had to sudo ln -sf /usr/bin/gcov-4.7 /usr/bin/gcov to make gcov point in the right place.

Upvotes: 25

paulm
paulm

Reputation: 5892

My problem was that I updated gcc and g++ so that I could use a newer compiler, but forgot to update the gcov version meaning running "gcov" or "lcov" picked up the previous compilers version of gcov.

So basically running g++ --version and gcov --version should yield the same version number else things are going to go very wrong.

Here is how I updated my compiler version, the last line being what I was missing to get it all working.

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 90
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 90
sudo update-alternatives --install /usr/bin/gcov gcov /usr/bin/gcov-4.9 90

Upvotes: 13

B M
B M

Reputation: 4019

I just had the same problem and I had the correct versions installed. Solution in my case: remove all *.gcda files from any subdir you compile in. My make clean did not cover them.

Upvotes: 10

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