Add project: abseil-cpp (https://github.com/abseil/abseil-cpp)

projects/abseil-cpp/README.org

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+#+title: Abseil - C++ Common Libraries
+
+Abseil is an open-source collection of C++ code (compliant to C++14) designed to
+augment the C++ standard library.
+
+See https://github.com/abseil/abseil-cpp.
+
+* Issues
+** Building/running tests on QNAP/QTS 4.x (using Entware-NG) does not work
+
+Trying to enable tests results in build failures.

projects/abseil-cpp/ossbuild-abseil-cpp.bash

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+#!/usr/bin/env bash
+
+# See:
+#
+# - https://github.com/abseil/abseil-cpp
+
+LIB_DIR="$(realpath "$(dirname "${BASH_SOURCE[0]}")/../../lib")"
+source "${LIB_DIR}/ossbuild-common.bash"
+
+ABSEIL_CPP_DEFAULT_VERSION='20230125.3'
+#https://github.com/abseil/abseil-cpp/archive/refs/tags/20230125.3.tar.gz
+
+ossbuild-abseil-cpp-prepare() {
+    local version gh_url archive archive_url src_tree
+    ossbuild-project-var-get -v version VERSION
+    ossbuild-project-var-get -v gh_url GH_URL
+    archive="$(ossbuild-project-src-path "$(ossbuild-project-archive-gnu)")"
+    archive_url="${gh_url}/archive/refs/tags/${version}.tar.gz"
+    src_tree="$(ossbuild-project-src-path "$(ossbuild-project-namever-gnu)")"
+
+    ossbuild-project-var-set ARCHIVE "${archive}"
+    ossbuild-project-var-set ARCHIVE_URL "${archive_url}"
+    ossbuild-project-var-set SRC_TREE "${src_tree}"
+
+    ossbuild-src-tar "${archive_url}" "${archive}"
+
+    [ -d "${src_tree}" ] || {
+        bsl_loge "failed to create '${src_tree}'"
+        ossbuild-project-var-unset SRC_TREE
+        return 2
+    }
+}
+
+ossbuild-abseil-cpp-build() {
+    local src_tree build_tree
+    ossbuild-project-var-get -v src_tree SRC_TREE
+    build_tree="${src_tree}/ossbuild"
+    ossbuild-project-var-set BUILD_TREE "${build_tree}"
+
+    local generate_opts=(
+        -B "${build_tree}"
+        -G Ninja
+        '-DCMAKE_BUILD_TYPE=Release'
+        "-DCMAKE_INSTALL_PREFIX=${PREFIX}"
+    )
+    if is-qnap-qts; then
+        generate_opts+=(
+            '-DCMAKE_INSTALL_LIBDIR=lib'
+        )
+    fi
+    generate_opts+=(
+        '-DCMAKE_CXX_STANDARD=14'
+        '-DABSL_PROPAGATE_CXX_STD=ON'
+    )
+    if ossbuild-run-tests-p; then
+        if is-qnap-qts; then
+            bsl_logw "when last checked (20230630) running Abseil tests on QNAO/QTS does not work"
+        else
+            generate_opts+=(
+                '-DABSL_BUILD_TESTING=ON'
+                '-DABSL_USE_GOOGLETEST_HEAD=ON'
+            )
+        fi
+    fi
+
+    ossbuild-cmd cmake "${generate_opts[@]}" "${src_tree}"
+    ossbuild-cmd cmake --build "${build_tree}"
+}
+
+ossbuild-abseil-cpp-install() {
+    local build_tree
+    ossbuild-project-var-get -v build_tree BUILD_TREE
+
+    local cmd=(
+        cmake
+        --build "${build_tree}"
+        --target 'install'
+    )
+    ossbuild-writable-p "${PREFIX}" || cmd=(sudo "${cmd[@]}")
+    ossbuild-cmd "${cmd[@]}"
+}
+
+_main_() {
+    ossbuild-project-gh-init 'abseil' 'abseil-cpp'
+    ossbuild-project-build-steps-all "${@}"
+}
+
+_main_ "${@}"