cmake_minimum_required(VERSION 3.20)
project(pqc-bench C)

set(CMAKE_C_STANDARD 11)

# ── Compiler flags ──────────────────────────────────────────────────────────
# Release build with full optimization; override on the command line:
#   cmake -DCMAKE_BUILD_TYPE=Debug ..
if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Release)
endif()

set(CMAKE_C_FLAGS_RELEASE "-O3 -march=native")

# ── Algorithm root (submodule) ───────────────────────────────────────────────
# Each target below compiles a variant of test_speed.c against a specific
# algorithm build.  Add algorithm libraries as submodule CMake subdirectories
# or via add_library() here as the project grows.
#
# Example layout once kyber submodule is added:
#   algorithms/kyber/ref/   → static lib kyber512_ref, kyber768_ref, kyber1024_ref
#   algorithms/kyber/avx2/  → static lib kyber512_avx2, ...

# ── Harness source ───────────────────────────────────────────────────────────
set(HARNESS_SRC src/test_speed.c)

# ── Build variants ───────────────────────────────────────────────────────────
# Uncomment and adjust as algorithm libraries become available.
#
# foreach(PARAM 512 768 1024)
#   foreach(VARIANT ref refnv)
#     set(TARGET "bench_mlkem${PARAM}_${VARIANT}")
#     add_executable(${TARGET} ${HARNESS_SRC})
#     target_include_directories(${TARGET} PRIVATE
#       ${CMAKE_SOURCE_DIR}/../algorithms/kyber/${VARIANT})
#     target_link_libraries(${TARGET} kyber${PARAM}_${VARIANT})
#     target_compile_definitions(${TARGET} PRIVATE KYBER_K=${PARAM})
#   endforeach()
# endforeach()

# ── PAPI (hardware performance counters) ─────────────────────────────────────
# Optional; enable with -DWITH_PAPI=ON
option(WITH_PAPI "Link against PAPI for hardware counter collection" OFF)
if(WITH_PAPI)
  find_library(PAPI_LIB papi REQUIRED)
  find_path(PAPI_INCLUDE papi.h REQUIRED)
  # Targets that need PAPI:
  # target_include_directories(<target> PRIVATE ${PAPI_INCLUDE})
  # target_link_libraries(<target> ${PAPI_LIB})
endif()

# ── RAPL energy measurement ──────────────────────────────────────────────────
# Optional; enable with -DWITH_RAPL=ON (requires root or CAP_SYS_RAWIO)
option(WITH_RAPL "Enable Intel RAPL energy measurement" OFF)
if(WITH_RAPL)
  # target_compile_definitions(<target> PRIVATE WITH_RAPL)
endif()