Build: add CMakeLists.txt alongside the .bat scripts

[felixx-sp]

Confidence: high · Effort: medium (1-3 d)

Problem

Four .bat files (build.bat, build_test.bat, build_bench.bat, build_ptxas.bat) each duplicate vswhere/vcvarsall setup and CUDA path detection. There is no IDE project, no dependency graph, no incremental rebuild. Contributors on Linux cannot even invoke nvcc against the project structure.

Files: build.bat, build_test.bat, build_bench.bat, build_ptxas.bat

Suggested fix

Add a top-level CMakeLists.txt using:

cmake_minimum_required(VERSION 3.18)
project(FSP.DMRCrack LANGUAGES C CUDA)
set(CMAKE_CUDA_ARCHITECTURES "75;86;89")

with targets:

• dmrcrack (GUI, Windows-only behind BUILD_GUI=ON)
• dmrcrack_cli (headless, all platforms — once the CLI issue lands)
• test_strict_score, test_bench (test targets)

Keep build.bat as a one-line wrapper around cmake --build for muscle memory.

Why it matters

Hard prerequisite for cross-platform support and modern IDE integration. Unblocks the POSIX HAL and CLI mode issues.