Creation of LTS branch "lts_2019_08_08"20190808

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  - 27c30ec671cb7b5ba84c4e79feff7fd0b0ac6338 Avoid undefined behavior when nullptr is passed to memcpy... by Roman Gershman <romange@gmail.com>
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  - 253eb7416421661873afbaa33828a850db978541 [CMake] Set correct flags for clang-cl (#278) by Loo Rong Jie <loorongjie@gmail.com>
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  - c1cecb25a94c075725e9d2640f6b978a8f61957b Implement Span::first and Span::last from C++20 (#274) by Girts <girtsf@users.noreply.github.com>
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  - 6b4201f9ef650637510a21b8d6cbcc3bee4a606f Fix GCC8 warnings by Boris Staletic <boris.staletic@gmail.com>
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GitOrigin-RevId: 9ee91d3e430fb33a4590486573792eb0fa146c2d
Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced

3 files changed, 194 insertions, 0 deletions

diff --git a/CMake/install_test_project/CMakeLists.txt b/CMake/install_test_project/CMakeLists.txt
new file mode 100644
index 00000000..06b797e9
--- /dev/null
+++ b/CMake/install_test_project/CMakeLists.txt
@@ -0,0 +1,27 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A simple CMakeLists.txt for testing cmake installation
+
+cmake_minimum_required(VERSION 3.5)
+project(absl_cmake_testing CXX)
+
+set(CMAKE_CXX_STANDARD 11)
+
+add_executable(simple simple.cc)
+
+find_package(absl REQUIRED)
+
+target_link_libraries(simple absl::strings)
diff --git a/CMake/install_test_project/simple.cc b/CMake/install_test_project/simple.cc
new file mode 100644
index 00000000..e9e35291
--- /dev/null
+++ b/CMake/install_test_project/simple.cc
@@ -0,0 +1,23 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+#include "absl/strings/substitute.h"
+
+int main(int argc, char** argv) {
+  for (int i = 0; i < argc; ++i) {
+    std::cout << absl::Substitute("Arg $0: $1\n", i, argv[i]);
+  }
+}
diff --git a/CMake/install_test_project/test.sh b/CMake/install_test_project/test.sh
new file mode 100755
index 00000000..99989b03
--- /dev/null
+++ b/CMake/install_test_project/test.sh
@@ -0,0 +1,144 @@
+#!/bin/bash
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# "Unit" and integration tests for Absl CMake installation
+
+# TODO(absl-team): This script isn't fully hermetic because
+# -DABSL_USE_GOOGLETEST_HEAD=ON means that this script isn't pinned to a fixed
+# version of GoogleTest. This means that an upstream change to GoogleTest could
+# break this test. Fix this by allowing this script to pin to a known-good
+# version of GoogleTest.
+
+# Fail on any error. Treat unset variables an error. Print commands as executed.
+set -euox pipefail
+
+install_absl() {
+  pushd "${absl_build_dir}"
+  if [[ "${#}" -eq 1 ]]; then
+    cmake -DCMAKE_INSTALL_PREFIX="${1}" "${absl_dir}"
+  else
+    cmake "${absl_dir}"
+  fi
+  cmake --build . --target install -- -j
+  popd
+}
+
+uninstall_absl() {
+  xargs rm < "${absl_build_dir}"/install_manifest.txt
+  rm -rf "${absl_build_dir}"
+  mkdir -p "${absl_build_dir}"
+}
+
+lts_install=""
+
+while getopts ":l" lts; do
+  case "${lts}" in
+    l )
+      lts_install="true"
+      ;;
+  esac
+done
+
+absl_dir=/abseil-cpp
+absl_build_dir=/buildfs/absl-build
+project_dir="${absl_dir}"/CMake/install_test_project
+project_build_dir=/buildfs/project-build
+
+mkdir -p "${absl_build_dir}"
+mkdir -p "${project_build_dir}"
+
+if [[ "${lts_install}" ]]; then
+  install_dir="/usr/local"
+else
+  install_dir="${project_build_dir}"/install
+fi
+mkdir -p "${install_dir}"
+
+# Test build, install, and link against installed abseil
+pushd "${project_build_dir}"
+if [[ "${lts_install}" ]]; then
+  install_absl
+  cmake "${project_dir}"
+else
+  install_absl "${install_dir}"
+  cmake "${project_dir}" -DCMAKE_PREFIX_PATH="${install_dir}"
+fi
+
+cmake --build . --target simple
+
+output="$(${project_build_dir}/simple "printme" 2>&1)"
+if [[ "${output}" != *"Arg 1: printme"* ]]; then
+  echo "Faulty output on simple project:"
+  echo "${output}"
+  exit 1
+fi
+
+popd
+
+# Test that we haven't accidentally made absl::abslblah
+pushd "${install_dir}"
+
+# Starting in CMake 3.12 the default install dir is lib$bit_width
+if [[ -d lib64 ]]; then
+  libdir="lib64"
+elif [[ -d lib ]]; then
+  libdir="lib"
+else
+  echo "ls *, */*, */*/*:"
+  ls *
+  ls */*
+  ls */*/*
+  echo "unknown lib dir"
+fi
+
+if [[ "${lts_install}" ]]; then
+  # LTS versions append the date of the release to the subdir.
+  # 9999/99/99 is the dummy date used in the local_lts workflow.
+  absl_subdir="absl_99999999"
+else
+  absl_subdir="absl"
+fi
+
+if ! grep absl::strings "${libdir}/cmake/${absl_subdir}/abslTargets.cmake"; then
+  cat "${libdir}"/cmake/absl/abslTargets.cmake
+  echo "CMake targets named incorrectly"
+  exit 1
+fi
+
+uninstall_absl
+popd
+
+if [[ ! "${lts_install}" ]]; then
+  # Test that we warn if installed without a prefix or a system prefix
+  output="$(install_absl 2>&1)"
+  if [[ "${output}" != *"Please set CMAKE_INSTALL_PREFIX"* ]]; then
+    echo "Install without prefix didn't warn as expected. Output:"
+    echo "${output}"
+    exit 1
+  fi
+  uninstall_absl
+
+  output="$(install_absl /usr 2>&1)"
+  if [[ "${output}" != *"Please set CMAKE_INSTALL_PREFIX"* ]]; then
+    echo "Install with /usr didn't warn as expected. Output:"
+    echo "${output}"
+    exit 1
+  fi
+  uninstall_absl
+fi
+
+echo "Install test complete!"
+exit 0