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Restore definition of `ANDROID` and `UNIX` when `CMAKE_SYSTEM_VERSION`
is `1`. This was broken by commit 1373373823 (enable_language:
Establish target platform identification variables earlier, 2023-06-06,
v3.27.0-rc1~3^2~1).
Fixes: #25004
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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
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Since commit a7f41a7ee4 (Android: Fix find_* search order within NDK for
unified toolchains, 2020-10-13, v3.20.0-rc1~610^2), we turn off
`CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH`. This breaks `find_program`
searching `PATH` for host executables. Fortunately, the setting turns
out not to be necessary, perhaps since commit cbc51a8be3 (Android:
restructure android search paths, 2020-11-06, v3.20.0-rc1~509^2).
Without it, none of NDK tests fail, so remove it to restore pre-3.20
behavior.
Fixes: #22634
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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.
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This change adds hooks to key Android support files, so that NDK can
inject information or change cmake behaviors.
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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
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The NDK build system now uses only a single toolchain in
<ndk>/toolchains/llvm/prebuilt/<host>
Its compilers are always `bin/{clang,clang++}` and its binutils are
always `bin/<triple>-*`. It is a standalone toolchain:
* The Anrdoid API level is specified at the end of `--target=`.
* The standard library may be specified via `-stdlib=`.
* No need to pass system includes or libraries explicitly.
* No need to pass `--sysroot` or `-gcc-toolchain`.
Teach CMake to recognize NDK versions that have a unified
toolchain with its own sysroot and use the above approach.
Fixes: #18739
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The unified headers are preferred as of NDK r15, so use them by default
if available and provide an option to use the deprecated headers.
Inspired-by: Florent Castelli <florent.castelli@gmail.com>
Fixes: #16584
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Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool. Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience. Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.
Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices. It also references version control
history for more precise information. Therefore we no longer need to spell
out the list of Contributors in each source file notice.
Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing". The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.
Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically. Manually fix up shebang lines and trailing
newlines in a few files. Manually update the notices in a few files that the
script does not handle.
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Android NDK builds are always `debug` or `release`. We may populate
flags for these configurations that are needed to produce compatible
binaries. Ensure they are used by default.
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Commonly used Android toolchain files that pre-date CMake upstream
support may need to be updated to work with our new functionality.
They typically set CMAKE_SYSTEM_VERSION to 1, so detect that and
skip our upstream Android settings. When such toolchain files are
updated to account for our upstream support, they can then set
CMAKE_SYSTEM_VERSION to a valid Android API and get new behavior.
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Compute CMAKE_SYSROOT automatically for the current API and architecture
selection. This causes the --sysroot option to be passed to GNU and
Clang compilers.
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Support for NVIDIA Nsight Tegra Visual Studio Edition was previously
implemented in the CMake VS IDE generators. Avoid interfering with
that functionality for now. Later we may try to integrate this.
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Add infrastructure modules to be loaded when initializing builds
targeting Android platforms.
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