lcov usage fails with clang

jamesob commented at 3:32 pm on March 5, 2018: member

When attempting to generate coverage information with make cov after configuring and building with clang, lcov/gcov (for the versions I’m using) are unable to parse the generated gcda files:

0/home/james/tmp/bitcoin/src/libbitcoin_server_a-miner.gcno:version '402*', prefer 'A72*'
1geninfo: ERROR: GCOV failed for /home/james/tmp/bitcoin/src/libbitcoin_server_a-miner.gcda!
2Makefile:1269: recipe for target 'test_bitcoin.info' failed

We may need to special-case the effects of --enable-lcov when building with clang to use flags and commands mentioned here.

Configure output

 0Options used to compile and link:
 1  with wallet   = yes
 2  with gui / qt = yes
 3    qt version  = 5
 4    with qr     = auto
 5  with zmq      = yes
 6  with test     = yes
 7  with bench    = yes
 8  with upnp     = auto
 9  use asm       = yes
10  debug enabled = no
11  werror        = no
12
13  target os     = linux
14  build os      =
15
16  CC            = /usr/bin/clang-4.0
17  CFLAGS        = -g -O2
18  CPPFLAGS      = -I/home/james/tmp/bitcoin/db4/include/ -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS
19  CXX           = /usr/bin/clang++-4.0 -std=c++11
20  CXXFLAGS      = -std=c++11 -std=c++11  --coverage -Og
21  LDFLAGS       = -L/home/james/tmp/bitcoin/db4/lib/ --coverage
22  ARFLAGS       = cr

Versions

 0 $ clang++-4.0 --version
 1
 2clang version 4.0.1-6 (tags/RELEASE_401/final)
 3Target: x86_64-pc-linux-gnu
 4Thread model: posix
 5InstalledDir: /usr/bin
 6
 7 $ lcov --version
 8
 9lcov: LCOV version 1.13
10
11 $ gcov --version
12
13gcov (Ubuntu 7.2.0-8ubuntu3.2) 7.2.0
14Copyright (C) 2017 Free Software Foundation, Inc.
15This is free software; see the source for copying conditions.
16There is NO warranty; not even for MERCHANTABILITY or
17FITNESS FOR A PARTICULAR PURPOSE.

`make cov` failure

 0$ make cov
 1...
 2/usr/bin/lcov --gcov-tool=/usr/bin/gcov -c  -d /home/james/tmp/bitcoin/src -t test_bitcoin -o test_bitcoin.info
 3Capturing coverage data from /home/james/tmp/bitcoin/src
 4Found gcov version: 7.2.0
 5Scanning /home/james/tmp/bitcoin/src for .gcda files ...
 6Found 290 data files in /home/james/tmp/bitcoin/src
 7Processing src/libbitcoin_server_a-miner.gcda
 8/home/james/tmp/bitcoin/src/libbitcoin_server_a-miner.gcno:version '402*', prefer 'A72*'
 9geninfo: ERROR: GCOV failed for /home/james/tmp/bitcoin/src/libbitcoin_server_a-miner.gcda!
10Makefile:1269: recipe for target 'test_bitcoin.info' failed
11make: *** [test_bitcoin.info] Error 29
12rm test_bitcoin.info baseline_filtered.info baseline.info

fanquake added the label Build system on Mar 5, 2018

MarcoFalke commented at 0:45 am on March 12, 2018: member

I always assumed that gcov only works with gcc.

jamesob commented at 10:21 pm on March 26, 2018: member

Might preferable to warn during configuration if --enable-coverage is combined with non-gcc usage. I’ll try for a PR soonish.

MarcoFalke commented at 2:20 am on February 27, 2019: member

I’d rather add support for llvm-cov in addition to --enable-lcov

MarcoFalke commented at 0:05 am on December 7, 2019: member

You can use llvm-cov with clang with the following diff applied:

 0diff --git a/configure.ac b/configure.ac
 1index 2c648b0b5c..c502543a1a 100644
 2--- a/configure.ac
 3+++ b/configure.ac
 4@@ -87,7 +87,7 @@ dnl Check/return PATH for base programs.
 5 AC_PATH_TOOL(AR, ar)
 6 AC_PATH_TOOL(RANLIB, ranlib)
 7 AC_PATH_TOOL(STRIP, strip)
 8-AC_PATH_TOOL(GCOV, gcov)
 9+AC_PATH_TOOL(GCOV, llvm-cov_gcov)
10 AC_PATH_PROG(LCOV, lcov)
11 dnl Python 3.5 is specified in .python-version and should be used if available, see doc/dependencies.md
12 AC_PATH_PROGS([PYTHON], [python3.5 python3.6 python3.7 python3.8 python3 python])

Then create an executable file

0$ cat ~/bin/llvm-cov_gcov 
1#!/usr/bin/env bash
2exec llvm-cov gcov "$@"
3$ which llvm-cov_gcov
4~/bin/llvm-cov_gcov

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lcov usage fails with clang #12602

Configure output

Versions

make cov failure

`make cov` failure