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CMake: Determine host page size at build time

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Needed for running on Asahi Linux.
This commit is contained in:
Stenzek
2024-02-24 21:40:56 +10:00
parent ab83247de3
commit 4a70164dac
5 changed files with 70 additions and 16 deletions
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42
CMakeModules/DuckStationUtils.cmake
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@ -5,3 +5,45 @@ function(disable_compiler_warnings_for_target target)
target_compile_options(${target} PRIVATE "-w")
endif()
endfunction()
function(detect_page_size)
# This is only needed for ARM64, or if the user hasn't overridden it explicitly.
if(NOT CPU_ARCH_ARM64 OR HOST_PAGE_SIZE)
return()
endif()
if(NOT LINUX OR ANDROID)
# For universal Apple builds, we use preprocessor macros to determine page size.
# Similar for Windows, except it's always 4KB.
return()
endif()
if(CMAKE_CROSSCOMPILING)
message(WARNING "Cross-compiling and can't determine page size, assuming default.")
return()
endif()
message(STATUS "Determining host page size")
set(detect_page_size_file ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c)
file(WRITE ${detect_page_size_file} "
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main() {
int res = sysconf(_SC_PAGESIZE);
printf(\"%d\", res);
return (res > 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}")
try_run(
detect_page_size_run_result
detect_page_size_compile_result
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}
${detect_page_size_file}
RUN_OUTPUT_VARIABLE detect_page_size_output)
if(NOT detect_page_size_compile_result OR NOT detect_page_size_run_result EQUAL 0)
message(FATAL_ERROR "Could not determine host page size.")
else()
message(STATUS "Host page size: ${detect_page_size_output}")
set(HOST_PAGE_SIZE ${detect_page_size_output} CACHE STRING "Reported host page size")
endif()
endfunction()