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# SoX Resampler Library Copyright (c) 2007-16 robs@users.sourceforge.net
# Licence for this file: LGPL v2.1 See LICENCE for details.
# Sets CMAKE_SYSTEM_PROCESSOR for cross-compiling.
macro (set_system_processor)
if (CMAKE_CROSSCOMPILING)
if ("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "" OR "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "unknown")
unset(CMAKE_SYSTEM_PROCESSOR)
endif ()
if (NOT DEFINED CMAKE_SYSTEM_PROCESSOR)
include (CheckCSourceCompiles)
set (CPU_LINES
"#if defined __x86_64__ || defined _M_X64 /*\;x86_64\;*/"
"#if defined __i386__ || defined _M_IX86 /*\;x86_32\;*/"
"#if defined __arm__ || defined _M_ARM /*\;arm\;*/"
)
foreach (CPU_LINE ${CPU_LINES})
string (CONCAT CPU_SOURCE "${CPU_LINE}" "
int main() {return 0;}
#endif
")
unset (SYSTEM_PROCESSOR_DETECTED CACHE)
check_c_source_compiles ("${CPU_SOURCE}" SYSTEM_PROCESSOR_DETECTED)
if (SYSTEM_PROCESSOR_DETECTED)
list (GET CPU_LINE 1 CMAKE_SYSTEM_PROCESSOR)
message (STATUS "CMAKE_SYSTEM_PROCESSOR is ${CMAKE_SYSTEM_PROCESSOR}")
break ()
endif ()
endforeach ()
endif ()
# N.B. Will not overwrite existing cache variable:
set (CMAKE_SYSTEM_PROCESSOR "${CMAKE_SYSTEM_PROCESSOR}"
CACHE STRING "Target system processor")
endif ()
endmacro ()
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