Set target platform identification variables like `APPLE` and `LINUX`
as soon as the target system is identified. This makes them available
during toolchain and binutils selection.
Fixes: #23333
This variable has been provided since commit 746906242d (Android: Detect
NDK version number, 2021-02-26, v3.20.0-rc3~1^2~3) when using CMake's
NDK support or the modern NDK toolchain file. Since commit 005e2cdfb0
(Android: Do not use gold for ndk >= r22, 2021-02-26, v3.20.0-rc3~1^2)
we need the value in our compiler/platform information files, so provide
it when using the NDK legacy toolchain file too.
Revert commit 1c86e397fe (Android/Clang: Tolerate undefined
CMAKE_ANDROID_NDK_VERSION, 2022-09-16, v3.25.0-rc1~118^2) since the
variable should now always be defined.
Issue: #21772Fixes: #24386
Since commit 62cd3904bf (variable: Set LINUX variable on Linux target
systems, 2022-08-10, v3.25.0-rc1~320^2), the `Platform/Android` module
inherits the `LINUX` variable setting from `Platform/Linux`. While
Android may use a Linux kernel, `CMAKE_SYSTEM_NAME` is not `Linux`, and
the platform does not follow conventions of most Linux distributions.
Fixes: #24196
When cross-compiling for Android, the library path suffixes `/<number>/`
refer to API level specific platform libraries instead of architecture
bitness. Disable path suffix use under NDK to avoid incorrect inclusion
of API level specific libraries below the targeted API level.
Fixes: #23830
Set `CMAKE_SYSTEM_PROGRAM_PATH` in `Platform/Android-Initialize` instead
of `Platform/Android` so it can be used in `CMakeFindBinUtils`.
Also add the names `llvm-strip` and `llvm-ranlib` for the corresponding
tools.
1. Set CMAKE_FIND_ROOT_PATH unconditionally.
Revise the implementation from commit a7f41a7ee4 (Android: Fix find_*
search order within NDK for unified toolchains, 2020-10-13). In the old
implementation, if people set CMAKE_FIND_ROOT_PATH, CMAKE_ANDROID_NDK
won't be added to find root. And all paths added to CMAKE_SYSTEM_*_PATH
below will be rerooted to the user specified root.
2. Add api level specific library path to CMAKE_SYSTEM_PREFIX_PATH.
As the discussion in [1], some people want the paths added by
UnixPaths.cmake. They install their libraries according to
GNUInstallDirs [2].
As a result, we cannot clear CMAKE_SYSTEM_PREFIX_PATH. It includes /usr
so no matter what we specify in CMAKE_SYSTEM_LIBRARY_PATH,
/usr/lib/<arch> will be searched first.
The author also pointed out a way to solve this issue [3]. In addition
to other paths, CMake also searches <root>/<prefix> [4]. So we can add
the API specific lib path to the beginning of CMAKE_SYSTEM_PREFIX_PATH,
to have it searched first.
[1] https://android-review.googlesource.com/c/platform/ndk/+/1486800
[2] https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html
[3] https://github.com/android/ndk/issues/1179#issuecomment-613435081
[4] 11425041f0/Source/cmSearchPath.cxx (L202)
The CMake support for Android assumes cross-compilation using the NDK,
so stub out that Android NDK support and use the Linux support that's
already invoked. Set CMAKE_HOST_SYSTEM_NAME to "Android", rather than
"Linux".
Issue: #19840
Nsight Tegra Visual Studio Edition handles prefixing of library names
with '-l' automatically, so teach the generator not to do so.
Reported-by: Mourad Boufarguine <mourad@boufarguine.name>
Create a Platform/Android module that includes Platform/Linux since
Android is based on Linux. Provide only the minimal settings needed to
get builds with Android NDK toolchains to work.
Disable use of RPATH since the Android loader ignores it and we cannot
predict the install destination anyway.
Android supports soname but shared library names must end in ".so" and
we cannot represent the versioned names with associated symlinks on all
host operating systems anyway. However, we do want the SONAME of
library files to be set so that linking to them by path to the library
file produces NEEDED entries with the soname and not the path. Add a
new CMAKE_PLATFORM_NO_VERSIONED_SONAME setting to tell the
cmTarget::GetLibraryNames method that not to use the VERSION or
SOVERSION target properties in the soname.
