From e599bba4216c0edb8cc8f40adad3a6dba88685f4 Mon Sep 17 00:00:00 2001
From: Lasse Collin <lasse.collin@tukaani.org>
Date: Sat, 19 Sep 2009 09:47:30 +0300
Subject: Various changes.

Separate a few reusable components from XZ Utils specific
code. The reusable code is now in "tuklib" modules. A few
more could be separated still, e.g. bswap.h.

Fix some bugs in lzmainfo.

Fix physmem and cpucores code on OS/2. Thanks to Elbert Pol
for help.

Add OpenVMS support into physmem. Add a few #ifdefs to ease
building XZ Utils on OpenVMS. Thanks to Jouk Jansen for the
original patch.
---
 m4/tuklib_physmem.m4 | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 m4/tuklib_physmem.m4

(limited to 'm4/tuklib_physmem.m4')

diff --git a/m4/tuklib_physmem.m4 b/m4/tuklib_physmem.m4
new file mode 100644
index 00000000..91e3dc56
--- /dev/null
+++ b/m4/tuklib_physmem.m4
@@ -0,0 +1,119 @@
+#
+# SYNOPSIS
+#
+#   TUKLIB_PHYSMEM
+#
+# DESCRIPTION
+#
+#   Check how to get the amount of physical memory.
+#   This information is used in tuklib_physmem.c.
+#
+#   Supported methods:
+#
+#     - Windows (including Cygwin), OS/2, DJGPP (DOS), and OpenVMS have
+#       operating-system specific functions.
+#
+#     - sysconf() works on GNU/Linux and Solaris, and possibly on
+#       some BSDs.
+#
+#     - BSDs use sysctl().
+#
+#     - sysinfo() works on Linux/dietlibc and probably on other Linux
+#       systems whose libc may lack sysconf().
+#
+# COPYING
+#
+#   Author: Lasse Collin
+#
+#   This file has been put into the public domain.
+#   You can do whatever you want with this file.
+#
+
+AC_DEFUN_ONCE([TUKLIB_PHYSMEM], [
+AC_REQUIRE([TUKLIB_COMMON])
+
+# sys/param.h might be needed by sys/sysctl.h.
+AC_CHECK_HEADERS([sys/param.h])
+
+AC_MSG_CHECKING([how to detect the amount of physical memory])
+
+# Maybe checking $host_os would be enough but this matches what
+# tuklib_physmem.c does.
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
+		|| defined(__DJGPP__) || defined(__VMS)
+int main(void) { return 0; }
+#else
+#error
+#endif
+]])], [
+	AC_MSG_RESULT([special])
+], [
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+int
+main(void)
+{
+	long i;
+	i = sysconf(_SC_PAGESIZE);
+	i = sysconf(_SC_PHYS_PAGES);
+	return 0;
+}
+]])], [
+	AC_DEFINE([TUKLIB_PHYSMEM_SYSCONF], [1],
+		[Define to 1 if the amount of physical memory can be detected
+		with sysconf(_SC_PAGESIZE) and sysconf(_SC_PHYS_PAGES).])
+	AC_MSG_RESULT([sysconf])
+], [
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/types.h>
+#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;
+}
+]])], [
+	AC_DEFINE([TUKLIB_PHYSMEM_SYSCTL], [1],
+		[Define to 1 if the amount of physical memory can be detected
+		with sysctl().])
+	AC_MSG_RESULT([sysctl])
+], [
+
+# This version of sysinfo() is Linux-specific. Some non-Linux systems have
+# different sysinfo() so we must check $host_os.
+case $host_os in
+	linux*)
+		AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/sysinfo.h>
+int
+main(void)
+{
+	struct sysinfo si;
+	sysinfo(&si);
+	return 0;
+}
+		]])], [
+			AC_DEFINE([TUKLIB_PHYSMEM_SYSINFO], [1],
+				[Define to 1 if the amount of physical memory
+				can be detected with Linux sysinfo().])
+			AC_MSG_RESULT([sysinfo])
+		], [
+			AC_MSG_RESULT([unknown])
+		])
+		;;
+	*)
+		AC_MSG_RESULT([unknown])
+		;;
+esac
+])])])
+])dnl
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