[travis] support clang code coverage (#3741)

.travis.yml

@@ -44,14 +44,14 @@ script:
   - .travis/script.sh
 
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - .travis/after_success.sh
 
 matrix:
   include:
     - env: BUILD_TARGET="posix-app-cli" VERBOSE=1 VIRTUAL_TIME=1
       os: linux
       compiler: gcc
-    - env: BUILD_TARGET="posix-app-pty" CC=clang CXX=clang++ VERBOSE=1
+    - env: BUILD_TARGET="posix-app-pty" CC=clang CXX=clang++ VERBOSE=1 COVERAGE=1
       os: linux
       compiler: clang
     - env: BUILD_TARGET="posix-app-pty" DAEMON=1 VERBOSE=1 COVERAGE=1

.travis/after_success.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+#
+#  Copyright (c) 2019, 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.
+#
+
+set -e
+
+codecov_upload() {
+    curl -s https://codecov.io/bash > codecov
+    chmod a+x codecov
+
+    # Assume gcov by default, and llvm-cov if CC is clang
+    if [[ -z $CC ]]; then
+        ./codecov
+    elif  "$CC" --version | grep -q gcc; then
+        ./codecov
+    elif "$CC" --version | grep -q clang; then
+        ./codecov -x "llvm-cov gcov"
+    fi
+}
+
+main() {
+    codecov_upload
+}
+
+main "$@"

configure.ac

@@ -1946,6 +1946,7 @@ CPPFLAGS="${CPPFLAGS} ${MBEDTLS_CPPFLAGS}"
 
 CPPFLAGS="${CPPFLAGS} ${NL_COVERAGE_CPPFLAGS}"
 LIBS="${LIBS} ${NL_COVERAGE_LIBS}"
+LDFLAGS="${LDFLAGS} ${NL_COVERAGE_LDFLAGS}"
 
 # At this point, we can restore the compiler flags to whatever the
 # user passed in, now that we're clear of an -Werror issues by