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#!/usr/bin/env bash
#
# Copyright IBM Corp. 2017
#
# Usage: diff_test
#
# Check lcov's diff function:
# - Compile two slightly different test programs
# - Run the programs and collect coverage data
# - Generate a patch containing the difference between the source code
# - Apply the patch to the coverage data
# - Compare the resulting patched coverage data file with the data from the
#   patched source file
#

function die()
{
	echo "Error: $@" >&2
	exit 1
}

make -C old || die "Failed to compile old source"
make -C new || die "Failed to compile new source"
diff -u $PWD/old/prog.c $PWD/new/prog.c > diff

$LCOV --diff old/prog.info diff --convert-filenames -o patched.info -t bla || \
	die "Failed to apply patch to coverage data file"
norminfo new/prog.info > new_normalized.info
norminfo patched.info > patched_normalized.info
sed -i -e 's/^TN:.*$/TN:/' patched_normalized.info

diff -u patched_normalized.info new_normalized.info || \
	die "Mismatch in patched coverage data file"

echo "Patched coverage data file matches expected file"