1#!/bin/bash
2
3#  This script is supposed to verify which compiler (GCC or clang) was
4#  used to build the packages in a ChromeOS image.  To use the script,
5#  just pass the path to the tree containing the *.debug files for a
6#  ChromeOS image.  It then reads the debug info in each .debug file
7#  it can find, checking the AT_producer field to determine whether
8#  the package was built with clang or GCC.  It counts the total
9#  number of .debug files found as well as how many are built with
10#  each compiler.  It writes out these statistics when it is done.
11#
12#  For a locally-built ChromeOS image, the debug directory is usually:
13#  ${chromeos_root}/chroot/build/${board}/usr/lib/debug (from outside
14#   chroot)
15#  or
16#  /build/${board}/usr/lib/debug (from inside chroot)
17#
18#  For a buildbot-built image you can usually download the debug tree
19#  (using 'gsutil cp') from
20#  gs://chromeos-archive-image/<path-to-your-artifact-tree>/debug.tgz
21#  After downloading it somewhere, you will need to uncompress and
22#  untar it before running this script.
23#
24
25DEBUG_TREE=$1
26
27clang_count=0
28gcc_count=0
29file_count=0
30
31# Verify the argument.
32
33if [[ $# != 1 ]]; then
34    echo "Usage error:"
35    echo "compiler-test.sh <debug_directory>"
36    exit 1
37fi
38
39
40if [[ ! -d ${DEBUG_TREE} ]] ; then
41    echo "Cannot find ${DEBUG_TREE}."
42    exit 1
43fi
44
45cd ${DEBUG_TREE}
46for f in `find . -name "*.debug" -type f` ; do
47    at_producer=`readelf --debug-dump=info $f | head -25 | grep AT_producer `;
48    if echo ${at_producer} | grep -q 'GNU C' ; then
49        ((gcc_count++))
50    elif echo ${at_producer} | grep -q 'clang'; then
51        ((clang_count++));
52    fi;
53    ((file_count++))
54done
55
56echo "GCC count: ${gcc_count}"
57echo "Clang count: ${clang_count}"
58echo "Total file count: ${file_count}"
59
60
61exit 0
62