44 lines
1.6 KiB
CMake
44 lines
1.6 KiB
CMake
# Copyright 2023 Google LLC. All rights reserved.
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#
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file or at
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# https://developers.google.com/open-source/licenses/bsd
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# CMake policy settings. These will be included before the project definition.
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# NOTE: Flags like MSVC are not available at this level.
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# Do not set default warning levels for MSVC. We will choose the warning level.
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cmake_policy(SET CMP0092 NEW)
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# Use modern project versioning behavior to avoid a warning on newer CMake.
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cmake_policy(SET CMP0048 NEW)
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# No in-source builds allowed.
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set(CMAKE_DISABLE_SOURCE_CHANGES ON)
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set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
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# TODO: Prevent accidental cmake invocation from deeper inside packager tree?
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# Minimum C++ version.
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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# Minimum GCC version, if using GCC.
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if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
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# Require at least GCC 9. Before GCC 9, C++17 filesystem libs don't link.
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if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9)
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message(FATAL_ERROR "GCC version must be at least 9! (Found ${CMAKE_CXX_COMPILER_VERSION})")
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endif()
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endif()
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# If the environment variable PACKAGER_LOW_MEMORY_BUILD is defined, limit the
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# number of parallel processes. This is used in our workflow to keep our arm64
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# builds from failing. There, we only have 4GB RAM to share among 6 CPUs.
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# NOTE: This only affects CMake's Ninja generator.
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if(DEFINED ENV{PACKAGER_LOW_MEMORY_BUILD})
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set_property(GLOBAL PROPERTY JOB_POOLS
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compile_jobs=4
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link_jobs=1)
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set(CMAKE_JOB_POOL_COMPILE compile_jobs)
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set(CMAKE_JOB_POOL_LINK link_jobs)
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endif()
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