Updates to tuklib_physmem and tuklib_cpucores.

Don't use #error to generate compile error, because some
compilers actually don't take it as an error. This fixes
tuklib_physmem on IRIX.

Fix incorrect error check for sysconf() return values.

Add AIX, HP-UX, and Tru64 specific code to detect the
amount RAM.

Add HP-UX specific code to detect the number of CPU cores.

Thanks a lot to Peter O'Gorman for initial patches,
testing, and debugging these fixes.

2 files changed, 97 insertions, 8 deletions

diff --git a/m4/tuklib_cpucores.m4 b/m4/tuklib_cpucores.m4
index d48f2e5..9e295c8 100644
--- a/m4/tuklib_cpucores.m4
+++ b/m4/tuklib_cpucores.m4
@@ -8,8 +8,10 @@
 #   Check how to find out the number of available CPU cores in the system.
 #   This information is used by tuklib_cpucores.c.
 #
-#   Currently this supports sysctl() (BSDs, OS/2) and sysconf() (GNU/Linux,
-#   Solaris, IRIX, Cygwin).
+#   Supported methods:
+#     - sysctl(): BSDs, OS/2
+#     - sysconf(): GNU/Linux, Solaris, Tru64, IRIX, AIX, Cygwin
+#     - pstat_getdynamic(): HP-UX
 #
 # COPYING
 #
@@ -63,11 +65,25 @@ main(void)
 #endif
 	return 0;
 }
-]])], [
-	tuklib_cv_cpucores_method=sysconf
-], [
+]])], [tuklib_cv_cpucores_method=sysconf], [
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/param.h>
+#include <sys/pstat.h>
+
+int
+main(void)
+{
+	struct pst_dynamic pst;
+	pstat_getdynamic(&pst, sizeof(pst), 1, 0);
+	(void)pst.psd_proc_cnt;
+	return 0;
+}
+]])], [tuklib_cv_cpucores_method=pstat_getdynamic], [
+
 	tuklib_cv_cpucores_method=unknown
-])])])
+])])])])
+
 case $tuklib_cv_cpucores_method in
 	sysctl)
 		AC_DEFINE([TUKLIB_CPUCORES_SYSCTL], [1],
@@ -80,5 +96,10 @@ case $tuklib_cv_cpucores_method in
 			can be detected with sysconf(_SC_NPROCESSORS_ONLN)
 			or sysconf(_SC_NPROC_ONLN).])
 		;;
+	pstat_getdynamic)
+		AC_DEFINE([TUKLIB_CPUCORES_PSTAT_GETDYNAMIC], [1],
+			[Define to 1 if the number of available CPU cores
+			can be detected with pstat_getdynamic().])
+		;;
 esac
 ])dnl
diff --git a/m4/tuklib_physmem.m4 b/m4/tuklib_physmem.m4
index a8c869f..1249925 100644
--- a/m4/tuklib_physmem.m4
+++ b/m4/tuklib_physmem.m4
@@ -13,11 +13,17 @@
 #     - Windows (including Cygwin), OS/2, DJGPP (DOS), and OpenVMS have
 #       operating-system specific functions.
 #
+#     - AIX has _system_configuration.physmem.
+#
 #     - sysconf() works on GNU/Linux and Solaris, and possibly on
 #       some BSDs.
 #
 #     - BSDs use sysctl().
 #
+#     - Tru64 uses getsysinfo().
+#
+#     - HP-UX uses pstat_getstatic().
+#
 #     - IRIX has setinvent_r(), getinvent_r(), and endinvent_r().
 #
 #     - sysinfo() works on Linux/dietlibc and probably on other Linux
@@ -42,15 +48,32 @@ AC_CACHE_CHECK([how to detect the amount of physical memory],
 
 # Maybe checking $host_os would be enough but this matches what
 # tuklib_physmem.c does.
+#
+# NOTE: IRIX has a compiler that doesn't error out with #error, so use
+# a non-compilable text instead of #error to generate an error.
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 #if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
 		|| defined(__DJGPP__) || defined(__VMS)
 int main(void) { return 0; }
 #else
-#error
+compile error
 #endif
 ]])], [tuklib_cv_physmem_method=special], [
 
+# 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).
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/systemcfg.h>
+
+int
+main(void)
+{
+	(void)_system_configuration.physmem;
+	return 0;
+}
+]])], [tuklib_cv_physmem_method=aix], [
+
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 #include <unistd.h>
 int
@@ -81,6 +104,35 @@ main(void)
 ]])], [tuklib_cv_physmem_method=sysctl], [
 
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/sysinfo.h>
+#include <machine/hal_sysinfo.h>
+
+int
+main(void)
+{
+	int memkb;
+	int start = 0;
+	getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start);
+	return 0;
+}
+]])], [tuklib_cv_physmem_method=getsysinfo],[
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#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_cv_physmem_method=pstat_getstatic],[
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 #include <invent.h>
 int
 main(void)
@@ -116,8 +168,14 @@ main(void)
 		tuklib_cv_physmem_method=unknown
 		;;
 esac
-])])])])])
+])])])])])])])])
+
 case $tuklib_cv_physmem_method in
+	aix)
+		AC_DEFINE([TUKLIB_PHYSMEM_AIX], [1],
+			[Define to 1 if the amount of physical memory
+			can be detected with _system_configuration.physmem.])
+		;;
 	sysconf)
 		AC_DEFINE([TUKLIB_PHYSMEM_SYSCONF], [1],
 			[Define to 1 if the amount of physical memory can
@@ -129,6 +187,16 @@ case $tuklib_cv_physmem_method in
 			[Define to 1 if the amount of physical memory can
 			be detected with sysctl().])
 		;;
+	getsysinfo)
+		AC_DEFINE([TUKLIB_PHYSMEM_GETSYSINFO], [1],
+			[Define to 1 if the amount of physical memory can
+			be detected with getsysinfo().])
+		;;
+	pstat_getstatic)
+		AC_DEFINE([TUKLIB_PHYSMEM_PSTAT_GETSTATIC], [1],
+			[Define to 1 if the amount of physical memory can
+			be detected with pstat_getstatic().])
+		;;
 	getinvent_r)
 		AC_DEFINE([TUKLIB_PHYSMEM_GETINVENT_R], [1],
 			[Define to 1 if the amount of physical memory