The name of the CPU CMake is running on.
On Windows, this variable is set to the value of the environment variable
PROCESSOR_ARCHITECTURE
.
On systems that support uname
, this variable is set to the output of:
uname -m
on GNU, Linux, Cygwin, Android, or
arch
on OpenBSD, or
on other systems,
uname -p
if its exit code is nonzero, or
uname -m
otherwise.
The value of uname -m
is used by default.
On Apple Silicon hosts, the architecture printed by uname -m
may vary
based on CMake's own architecture and that of the invoking process tree.
Added in version 3.19.2: On Apple Silicon hosts:
The CMAKE_APPLE_SILICON_PROCESSOR
variable or
the CMAKE_APPLE_SILICON_PROCESSOR
environment variable
may be set to specify the host architecture explicitly.
If CMAKE_OSX_ARCHITECTURES
is not set, CMake adds explicit
flags to tell the compiler to build for the host architecture so the
toolchain does not have to guess based on the process tree's architecture.