create new project

.gitignore

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+/build/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+project(nf7 C CXX)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+include(cmake/git_hash.cmake)
+
+add_subdirectory(iface)
+add_subdirectory(core)
+
+add_executable(nf7)
+target_sources(nf7 PRIVATE main.cc)
+target_link_libraries(nf7 PRIVATE nf7_iface nf7_core)

Dockerfile

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+FROM alpine:3.14
+
+RUN apk add --no-cache  \
+  cmake  \
+  gdb  \
+  git  \
+  g++  \
+  make
+
+WORKDIR /repo

cmake/git_hash.cmake

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+set(dir "${CMAKE_CURRENT_BINARY_DIR}/generated")
+set(out "${dir}/git_hash.hh")
+
+find_program(SH sh REQUIRED)
+
+make_directory("${dir}")
+add_custom_command(
+  COMMAND  ${SH} -c "echo constexpr const char\* GIT_HASH = \\\"`git rev-parse --short HEAD``git diff --quiet && echo \\\*`\\\"\\; > ${out}"
+  OUTPUT  "${out}"
+  DEPENDS "${PROJECT_SOURCE_DIR}/.git/HEAD"
+  VERBATIM
+)
+
+add_library(git_hash INTERFACE)
+target_sources(git_hash PUBLIC "${out}")
+target_include_directories(git_hash INTERFACE ${CMAKE_CURRENT_BINARY_DIR})
+
+unset(out)
+unset(dir)

core/CMakeLists.txt

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+add_library(nf7_core)
+target_link_libraries(nf7_core PRIVATE git_hash nf7_iface)
+
+target_sources(nf7_core
+  PRIVATE
+    version.cc
+  PUBLIC
+    version.hh
+)

core/version.cc

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+// No copyright
+#include "core/version.hh"
+
+#include "generated/git_hash.hh"
+
+namespace nf7::core {
+
+const char* version() noexcept { return GIT_HASH; }
+
+}  // namespace nf7::core

core/version.hh

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+// No copyright
+#pragma once
+
+namespace nf7::core {
+
+const char* version() noexcept;
+
+}  // namespace nf7::core

docker-compose.yml

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+version: '3'
+
+services:
+  dev:
+    build: .
+    volumes:
+      - ./:/repo/

iface/CMakeLists.txt

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+add_library(nf7_iface)
+target_include_directories(nf7_iface PUBLIC ${PROJECT_SOURCE_DIR})
+target_link_libraries(nf7_iface PRIVATE git_hash)
+
+target_sources(nf7_iface
+  PRIVATE
+    version.cc
+  PUBLIC
+    version.hh
+)

iface/version.cc

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+// No copyright
+#include "iface/version.hh"
+
+#include <cstdint>
+
+#include "generated/git_hash.hh"
+
+
+namespace nf7::iface {
+
+const char* version() noexcept { return GIT_HASH; }
+
+}  // namespace nf7::iface

iface/version.hh

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+// No copyright
+#pragma once
+
+namespace nf7::iface {
+
+const char* version() noexcept;
+
+}  // namespace nf7::iface

main.cc

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+// No copyright
+
+#include <iostream>
+
+#include "iface/version.hh"
+
+#include "core/version.hh"
+
+
+int main() {
+  std::cout << "iface version: " << nf7::iface::version() << std::endl;
+  std::cout << "core  version: " << nf7::iface::version() << std::endl;
+}