ClickHouse/cmake/arch.cmake

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if (CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
set (ARCH_AARCH64 1)
endif ()
if (ARCH_AARCH64 OR CMAKE_SYSTEM_PROCESSOR MATCHES "arm")
set (ARCH_ARM 1)
endif ()
if (CMAKE_LIBRARY_ARCHITECTURE MATCHES "i386")
set (ARCH_I386 1)
endif ()
if ( ( ARCH_ARM AND NOT ARCH_AARCH64 ) OR ARCH_I386)
set (ARCH_32 1)
message (WARNING "Support for 32bit platforms is highly experimental")
endif ()
if (CMAKE_SYSTEM MATCHES "Linux")
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set (OS_LINUX 1)
endif ()
if (CMAKE_SYSTEM MATCHES "FreeBSD")
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set (OS_FREEBSD 1)
endif ()
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set (COMPILER_GCC 1)
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
set (COMPILER_CLANG 1)
endif ()