85 lines
2.1 KiB
Plaintext
85 lines
2.1 KiB
Plaintext
dnl ###########################################################################
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dnl
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dnl lc_PHYSMEM - Check how to find out the amount of physical memory
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dnl
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dnl - sysconf() gives all the needed info on GNU+Linux and Solaris.
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dnl - BSDs use sysctl().
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dnl - sysinfo() works on Linux/dietlibc and probably on other Linux systems
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dnl whose libc may lack sysconf().
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dnl
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dnl ###########################################################################
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dnl
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dnl Author: Lasse Collin
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dnl
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dnl This file has been put into the public domain.
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dnl You can do whatever you want with this file.
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dnl
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dnl ###########################################################################
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AC_DEFUN([lc_PHYSMEM], [
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AC_MSG_CHECKING([how to detect the amount of physical memory])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <unistd.h>
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int
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main(void)
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{
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long i;
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i = sysconf(_SC_PAGESIZE);
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i = sysconf(_SC_PHYS_PAGES);
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return 0;
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}
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]])], [
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AC_DEFINE([HAVE_PHYSMEM_SYSCONF], [1],
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[Define to 1 if the amount of physical memory can be detected
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with sysconf(_SC_PAGESIZE) and sysconf(_SC_PHYS_PAGES).])
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AC_MSG_RESULT([sysconf])
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], [
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <sys/types.h>
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#ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#include <sys/sysctl.h>
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int
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main(void)
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{
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int name[2] = { CTL_HW, HW_PHYSMEM };
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unsigned long mem;
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size_t mem_ptr_size = sizeof(mem);
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sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
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return 0;
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}
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]])], [
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AC_DEFINE([HAVE_PHYSMEM_SYSCTL], [1],
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[Define to 1 if the amount of physical memory can be detected
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with sysctl().])
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AC_MSG_RESULT([sysctl])
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], [
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dnl sysinfo() is Linux-specific. Some non-Linux systems have
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dnl incompatible sysinfo() so we must check $host_os.
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case $host_os in
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linux*)
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <sys/sysinfo.h>
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int
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main(void)
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{
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struct sysinfo si;
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sysinfo(&si);
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return 0;
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}
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]])], [
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AC_DEFINE([HAVE_PHYSMEM_SYSINFO], [1],
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[Define to 1 if the amount of physical memory
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can be detected with Linux sysinfo().])
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AC_MSG_RESULT([sysinfo])
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], [
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AC_MSG_RESULT([unknown])
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])
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;;
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*)
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AC_MSG_RESULT([unknown])
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;;
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esac
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])])
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])dnl lc_PHYSMEM
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