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Android: Root searches within the NDK for unified toolchains

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Set `CMAKE_FIND_ROOT_PATH_MODE_*` appropriately.
This commit is contained in:
Haibo Huang
2020-10-12 15:32:19 -07:00
committed by Brad King
parent 5988a4deea
commit 5cdf37e4cc
1 changed files with 38 additions and 0 deletions
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38
Modules/Platform/Android.cmake
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@@ -22,3 +22,41 @@ set(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "")
if(CMAKE_VS_PLATFORM_NAME STREQUAL "Tegra-Android")
set(CMAKE_LINK_LIBRARY_FLAG "")
endif()
# Commonly used Android toolchain files that pre-date CMake upstream support
# set CMAKE_SYSTEM_VERSION to 1. Avoid interfering with them.
if(CMAKE_SYSTEM_VERSION EQUAL 1)
return()
endif()
if(CMAKE_ANDROID_NDK_TOOLCHAIN_UNIFIED)
# Tell CMake not to search host sysroots for headers/libraries.
# CMAKE_FIND_ROOT_PATH must be non-empty for CMAKE_FIND_ROOT_PATH_MODE_* == ONLY
# to be meaningful. The actual path used here is fairly meaningless since CMake
# doesn't handle the NDK sysroot layout (per-arch and per-verion subdirectories for
# libraries), so find_library is handled separately by CMAKE_SYSTEM_LIBRARY_PATH.
# https://github.com/android-ndk/ndk/issues/890
if(NOT CMAKE_FIND_ROOT_PATH)
list(APPEND CMAKE_FIND_ROOT_PATH "${CMAKE_ANDROID_NDK}")
endif()
# Allow users to override these values in case they want more strict behaviors.
# For example, they may want to prevent the NDK's libz from being picked up so
# they can use their own.
# https://github.com/android-ndk/ndk/issues/517
if(NOT DEFINED CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
endif()
if(NOT DEFINED CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
endif()
if(NOT DEFINED CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
endif()
if(NOT DEFINED CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
endif()
endif()