Wind River Support Network

Description

Customer is trying to enable code coverage support (gcov) on platforms using Windriver Linux 6. They were running into an issue that the compiler team thinks is same as - http://sourceforge.net/p/ltp/mailman/message/31427972/

Workaround

Apply the attached hotfix. (run the script with '-a' option).

This hotfix can be applied globally in wrlinux install dir, or locally in a project configured with '--enable-stand-alone-project=yes' option. 

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The problem appears only when pre-existing .gcno files are in the build dir.
Thus a simple work around is to always clean .gcno files before compiling, as in:
$ find . -name '*.gcno' | xargs rm

Steps to Reproduce

$ cat bug-gcno.sh
#!/bin/sh
set -e
# Paramaters
CC=/opt/data2/work/nmarguet/juni/lx6-buildtoolchain-rcpl25_prj/bitbake_build/tmp/sysroots/x86_64-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-gcc
$CC --version
# Clean
rm -f test.o test.gcno test.i
# Generate a "large" file with random content
dd if=/dev/urandom of=test.gcno bs=512 count=100
# Generate a simple .i file
echo "int main() { return 0; }" >test.i
# Compile with coverage enabled
${CC} -ftest-coverage -fprofile-arcs -c -o test.o test.i
# Get byte size of generated .gcno file
gcno_size=`stat --printf=%s test.gcno`
# Check whether .gcno file is correctly truncated
if [ "$gcno_size" = 51200 ]; then
    # The gcno file has still some garbage at the end
    echo "FAILURE: your compiler has the .gcno file bug"
    exit 1
fi
echo "SUCCESS: your compiler does not have the .gcno file bug"

$ ./bug-gcno.sh
x86_64-wrs-linux-gcc (GCC) 4.8.1
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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51200 bytes (51 kB) copied, 0.0128873 s, 4.0 MB/s
FAILURE: your compiler has the .gcno file bug

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