[code-style] require clang-format-5.0 (#2645)

configure.ac

@@ -357,7 +357,7 @@ fi
 # Code style
 #
 
-AC_SUBST(PRETTY, ["clang-format"])
+AC_SUBST(PRETTY, ["\${abs_top_srcdir}/script/clang-format.sh"])
 AC_SUBST(PRETTY_ARGS, ["-style=file -i"])
 AC_SUBST(PRETTY_CHECK, ["\${abs_top_srcdir}/script/clang-format-check.sh"])
 AC_SUBST(PRETTY_CHECK_ARGS, [""])

script/bootstrap

@@ -47,6 +47,9 @@ install_packages_apt()
     sudo add-apt-repository -y ppa:team-gcc-arm-embedded/ppa
     sudo apt-get update
     sudo apt-get install gcc-arm-embedded
+
+    # add clang-format for pretty
+    sudo apt-get install clang-format-5.0
 }
 
 install_packages_opkg()

script/clang-format-check.sh

@@ -33,14 +33,9 @@
 # replacements.
 #
 
-die() {
-    echo " *** ERROR: " $*
-    exit 1
-}
-
 set -x
 
 # from `man diff`:
 # Exit status is 0 if inputs are the same, 1 if different, 2 if trouble.
 
-clang-format -style=file $@  | diff -u $@ -
+$(dirname "$0")/clang-format.sh -style=file $@  | diff -u $@ -

script/clang-format.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+#
+#  Copyright (c) 2018, The OpenThread Authors.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions are met:
+#  1. Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#  2. Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#  3. Neither the name of the copyright holder nor the
+#     names of its contributors may be used to endorse or promote products
+#     derived from this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+#  POSSIBILITY OF SUCH DAMAGE.
+#
+
+CLANG_FORMAT_VERSION="clang-format version 5.0"
+
+die() {
+    echo " *** ERROR: " $*
+    exit 1
+}
+
+if which clang-format > /dev/null; then
+    case "$(clang-format --version)" in
+        "$CLANG_FORMAT_VERSION"*)
+            ;;
+        *)
+            die "clang-format 5.0 required"
+            ;;
+    esac
+elif which clang-format-5.0 > /dev/null; then
+    alias clang-format=clang-format-5.0
+else
+    die "clang-format 5.0 required"
+fi
+
+clang-format $@