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cmake_minimum_required(VERSION 3.20)
project(detect_compiler NONE)
if(CMAKE_GENERATOR STREQUAL "Ninja" AND CMAKE_SYSTEM_NAME STREQUAL "Windows")
set(CMAKE_C_COMPILER_WORKS 1)
set(CMAKE_C_COMPILER_FORCED 1)
set(CMAKE_CXX_COMPILER_WORKS 1)
set(CMAKE_CXX_COMPILER_FORCED 1)
endif()
enable_language(C)
enable_language(CXX)
if(VCPKG_COMPILER_CACHE_FILE)
if(EXISTS "${VCPKG_COMPILER_CACHE_FILE}")
file(READ "${VCPKG_COMPILER_CACHE_FILE}" JSON_CONTENT)
else()
set(JSON_CONTENT "{}")
endif()
function(get_hash compiler_path out_var)
file(TO_CMAKE_PATH "${compiler_path}" "compiler_path")
file(SIZE "${compiler_path}" SIZE)
file(TIMESTAMP "${compiler_path}" TIMESTAMP "%s" UTC)
string(JSON COMPILER_EXISTS ERROR_VARIABLE JSON_ERROR GET "${JSON_CONTENT}" "${compiler_path}")
if(NOT JSON_ERROR)
# Get compiler attributes using JSON API
string(JSON SIZE_JSON GET "${JSON_CONTENT}" "${compiler_path}" "size")
string(JSON TIMESTAMP_JSON GET "${JSON_CONTENT}" "${compiler_path}" "timestamp")
string(JSON HASH_JSON GET "${JSON_CONTENT}" "${compiler_path}" "hash")
if ((SIZE_JSON EQUAL SIZE) AND (TIMESTAMP_JSON EQUAL TIMESTAMP))
set("${out_var}" "${HASH_JSON}" PARENT_SCOPE)
return()
endif()
endif()
file(SHA1 "${compiler_path}" HASH)
# Add new entry to JSON
string(JSON JSON_CONTENT SET "${JSON_CONTENT}" "${compiler_path}" "{\"size\": ${SIZE}, \"timestamp\": ${TIMESTAMP}, \"hash\": \"${HASH}\"}")
set("${out_var}" "${HASH}" PARENT_SCOPE)
set(JSON_CONTENT "${JSON_CONTENT}" PARENT_SCOPE)
endfunction()
get_hash("${CMAKE_C_COMPILER}" C_HASH)
get_hash("${CMAKE_CXX_COMPILER}" CXX_HASH)
# Write updated JSON back to file
file(WRITE "${VCPKG_COMPILER_CACHE_FILE}" "${JSON_CONTENT}")
else()
file(SHA1 "${CMAKE_CXX_COMPILER}" CXX_HASH)
file(SHA1 "${CMAKE_C_COMPILER}" C_HASH)
endif()
string(SHA1 COMPILER_HASH "${C_HASH}${CXX_HASH}")
message("#COMPILER_HASH#${COMPILER_HASH}")
message("#COMPILER_C_HASH#${C_HASH}")
message("#COMPILER_C_VERSION#${CMAKE_C_COMPILER_VERSION}")
message("#COMPILER_C_ID#${CMAKE_C_COMPILER_ID}")
message("#COMPILER_C_PATH#${CMAKE_C_COMPILER}")
message("#COMPILER_CXX_HASH#${CXX_HASH}")
message("#COMPILER_CXX_VERSION#${CMAKE_CXX_COMPILER_VERSION}")
message("#COMPILER_CXX_ID#${CMAKE_CXX_COMPILER_ID}")
message("#COMPILER_CXX_PATH#${CMAKE_CXX_COMPILER}")
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