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#
# tuklib_physmem.cmake - see tuklib_physmem.m4 for description and comments
#
# NOTE: Compared tuklib_physmem.m4, this lacks support for Tru64, IRIX, and
# Linux sysinfo() (usually sysconf() is used on GNU/Linux).
#
# Author: Lasse Collin
#
# This file has been put into the public domain.
# You can do whatever you want with this file.
#
include("${CMAKE_CURRENT_LIST_DIR}/tuklib_common.cmake")
include(CheckCSourceCompiles)
include(CheckIncludeFile)
function(tuklib_physmem_internal_check)
# Shortcut on Windows:
if(WIN32 OR CYGWIN)
# Nothing to do, the tuklib_physmem.c handles it.
set(TUKLIB_PHYSMEM_DEFINITIONS "" CACHE INTERNAL "")
return()
endif()
# Full check for special cases:
check_c_source_compiles("
#if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
|| defined(__DJGPP__) || defined(__VMS) \
|| defined(AMIGA) || defined(__AROS__) || defined(__QNX__)
int main(void) { return 0; }
#else
compile error
#endif
"
TUKLIB_PHYSMEM_SPECIAL)
if(TUKLIB_PHYSMEM_SPECIAL)
# Nothing to do, the tuklib_physmem.c handles it.
set(TUKLIB_PHYSMEM_DEFINITIONS "" CACHE INTERNAL "")
return()
endif()
# Look for AIX-specific solution before sysconf(), because the test
# for sysconf() will pass on AIX but won't actually work
# (sysconf(_SC_PHYS_PAGES) compiles but always returns -1 on AIX).
check_c_source_compiles("
#include <sys/systemcfg.h>
int main(void)
{
(void)_system_configuration.physmem;
return 0;
}
"
TUKLIB_PHYSMEM_AIX)
if(TUKLIB_PHYSMEM_AIX)
set(TUKLIB_PHYSMEM_DEFINITIONS "TUKLIB_PHYSMEM_AIX" CACHE INTERNAL "")
return()
endif()
# sysconf()
check_c_source_compiles("
#include <unistd.h>
int main(void)
{
long i;
i = sysconf(_SC_PAGESIZE);
i = sysconf(_SC_PHYS_PAGES);
return 0;
}
"
TUKLIB_PHYSMEM_SYSCONF)
if(TUKLIB_PHYSMEM_SYSCONF)
set(TUKLIB_PHYSMEM_DEFINITIONS "TUKLIB_PHYSMEM_SYSCONF"
CACHE INTERNAL "")
return()
endif()
# sysctl()
check_include_file(sys/param.h HAVE_SYS_PARAM_H)
if(HAVE_SYS_PARAM_H)
list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_SYS_PARAM_H)
endif()
check_c_source_compiles("
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#include <sys/sysctl.h>
int main(void)
{
int name[2] = { CTL_HW, HW_PHYSMEM };
unsigned long mem;
size_t mem_ptr_size = sizeof(mem);
sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
return 0;
}
"
TUKLIB_PHYSMEM_SYSCTL)
if(TUKLIB_PHYSMEM_SYSCTL)
if(HAVE_SYS_PARAM_H)
set(TUKLIB_PHYSMEM_DEFINITIONS
"HAVE_PARAM_H;TUKLIB_PHYSMEM_SYSCTL"
CACHE INTERNAL "")
else()
set(TUKLIB_PHYSMEM_DEFINITIONS
"TUKLIB_PHYSMEM_SYSCTL"
CACHE INTERNAL "")
endif()
return()
endif()
# HP-UX
check_c_source_compiles("
#include <sys/param.h>
#include <sys/pstat.h>
int main(void)
{
struct pst_static pst;
pstat_getstatic(&pst, sizeof(pst), 1, 0);
(void)pst.physical_memory;
(void)pst.page_size;
return 0;
}
"
TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
if(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
set(TUKLIB_PHYSMEM_DEFINITIONS "TUKLIB_PHYSMEM_PSTAT_GETSTATIC"
CACHE INTERNAL "")
return()
endif()
endfunction()
function(tuklib_physmem TARGET_OR_ALL)
if(NOT DEFINED TUKLIB_PHYSMEM_FOUND)
message(STATUS "Checking how to detect the amount of physical memory")
tuklib_physmem_internal_check()
if(DEFINED TUKLIB_PHYSMEM_DEFINITIONS)
set(TUKLIB_PHYSMEM_FOUND 1 CACHE INTERNAL "")
else()
set(TUKLIB_PHYSMEM_FOUND 0 CACHE INTERNAL "")
message(WARNING
"No method to detect the amount of physical memory was found")
endif()
endif()
if(TUKLIB_PHYSMEM_FOUND)
tuklib_add_definitions("${TARGET_OR_ALL}"
"${TUKLIB_PHYSMEM_DEFINITIONS}")
endif()
endfunction()
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