stdlib: fix compilation error on OpenIndiana

[Bruno Haible]

When building clisp on OpenIndiana, I'm encountering this compilation error:

In file included from .../gllib/stdlib.h:51:0,
from clisp.c:2167:
/usr/include/sys/loadavg.h:47:2: error: unknown type name 'hrtime_t'
hrtime_t lg_total; /* used to temporarily hold load totals */
^~~~~~~~
/usr/include/sys/loadavg.h:48:2: error: unknown type name 'hrtime_t'
hrtime_t lg_loads[S_LOADAVG_SZ]; /* table of recorded entries */
^~~~~~~~
*** Error code 1

The cause is that <sys/loadavg.h>, which gnulib's stdlib.h replacement includes,
is not self-contained. Reported at <https://www.illumos.org/issues/9021>.

This patch provides a workaround.


2018-02-03 Bruno Haible <***@clisp.org>

stdlib: Fix compilation error on OpenIndiana.
* lib/stdlib.in.h: Before including <sys/loadavg.h>, include
<sys/time.h>.
* m4/stdlib_h.m4 (gl_STDLIB_H): Likewise.
* m4/getloadavg.m4 (gl_GETLOADAVG): Likewise.

diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index b9701d5..c8a5d0d 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -47,6 +47,9 @@

/* Solaris declares getloadavg() in <sys/loadavg.h>. */
#if (@GNULIB_GETLOADAVG@ || defined GNULIB_POSIXCHECK) && @HAVE_SYS_LOADAVG_H@
+/* OpenIndiana has a bug: <sys/time.h> must be included before
+ <sys/loadavg.h>. */
+# include <sys/time.h>
# include <sys/loadavg.h>
#endif

diff --git a/m4/getloadavg.m4 b/m4/getloadavg.m4
index acc2665..7b6a09a 100644
--- a/m4/getloadavg.m4
+++ b/m4/getloadavg.m4
@@ -7,7 +7,7 @@
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

-#serial 6
+#serial 7

# Autoconf defines AC_FUNC_GETLOADAVG, but that is obsolescent.
# New applications should use gl_GETLOADAVG instead.
@@ -92,6 +92,9 @@ else
fi
AC_CHECK_DECL([getloadavg], [], [HAVE_DECL_GETLOADAVG=0],
[[#if HAVE_SYS_LOADAVG_H
+ /* OpenIndiana has a bug: <sys/time.h> must be included before
+ <sys/loadavg.h>. */
+ # include <sys/time.h>
# include <sys/loadavg.h>
#endif
#include <stdlib.h>]])
diff --git a/m4/stdlib_h.m4 b/m4/stdlib_h.m4
index eff6f9e..49dc5d5 100644
--- a/m4/stdlib_h.m4
+++ b/m4/stdlib_h.m4
@@ -1,4 +1,4 @@
-# stdlib_h.m4 serial 44
+# stdlib_h.m4 serial 45
dnl Copyright (C) 2007-2018 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -14,6 +14,9 @@ AC_DEFUN([gl_STDLIB_H],
dnl guaranteed by C89.
gl_WARN_ON_USE_PREPARE([[#include <stdlib.h>
#if HAVE_SYS_LOADAVG_H
+/* OpenIndiana has a bug: <sys/time.h> must be included before
+ <sys/loadavg.h>. */
+# include <sys/time.h>
# include <sys/loadavg.h>
#endif
#if HAVE_RANDOM_H