(AM_FUNC_GETLOADAVG): Replace with AC_FUNC_GETLOADAVG

from autoconf, and tweak the latter to accept an optional argument.

1 files changed, 52 insertions, 76 deletions

diff --git a/m4/getloadavg.m4 b/m4/getloadavg.m4
index 9488c9a8c..d0ab2b85c 100644
--- a/m4/getloadavg.m4
+++ b/m4/getloadavg.m4
@@ -1,22 +1,45 @@
-#serial 6
+#serial 7
 
-AC_DEFUN(AM_FUNC_GETLOADAVG,
+# A replacement for autoconf's macro by the same name.  This version
+# accepts an optional argument specifying the name of the $srcdir-relative
+# directory in which the file getloadavg.c may be found.  It is unusual
+# (but justified, imho) that this file is required at ./configure time.
+
+undefine([AC_FUNC_GETLOADAVG])
+
+# AC_FUNC_GETLOADAVG
+# ------------------
+AC_DEFUN([AC_FUNC_GETLOADAVG],
 [ac_have_func=no # yes means we've found a way to get the load average.
 
-am_cv_saved_LIBS="$LIBS"
+# By default, expect to find getloadavg.c in $srcdir/.
+ac_lib_dir_getloadavg=$srcdir
+# But if there's an argument, DIR, expect to find getloadavg.c in $srcdir/DIR.
+ifval([$1], [ac_lib_dir_getloadavg=$srcdir/$1])
+# Make sure getloadavg.c is where it belongs, at ./configure-time.
+test -f $ac_lib_dir_getloadavg/getloadavg.c \
+  || AC_MSG_ERROR([getloadavg.c is not in $ac_lib_dir_getloadavg])
+# FIXME: Add an autoconf-time test, too?
+
+ac_save_LIBS=$LIBS
+
+# Check for getloadavg, but be sure not to touch the cache variable.
+(AC_CHECK_FUNC(getloadavg, exit 0, exit 1)) && ac_have_func=yes
 
 # On HPUX9, an unprivileged user can get load averages through this function.
 AC_CHECK_FUNCS(pstat_getdynamic)
 
 # Solaris has libkstat which does not require root.
 AC_CHECK_LIB(kstat, kstat_open)
-if test $ac_cv_lib_kstat_kstat_open = yes ; then ac_have_func=yes ; fi
+test $ac_cv_lib_kstat_kstat_open = yes && ac_have_func=yes
 
 # Some systems with -lutil have (and need) -lkvm as well, some do not.
 # On Solaris, -lkvm requires nlist from -lelf, so check that first
 # to get the right answer into the cache.
 # For kstat on solaris, we need libelf to force the definition of SVR4 below.
-AC_CHECK_LIB(elf, elf_begin, LIBS="-lelf $LIBS")
+if test $ac_have_func = no; then
+  AC_CHECK_LIB(elf, elf_begin, LIBS="-lelf $LIBS")
+fi
 if test $ac_have_func = no; then
   AC_CHECK_LIB(kvm, kvm_open, LIBS="-lkvm $LIBS")
   # Check for the 4.4BSD definition of getloadavg.
@@ -27,75 +50,32 @@ fi
 if test $ac_have_func = no; then
   # There is a commonly available library for RS/6000 AIX.
   # Since it is not a standard part of AIX, it might be installed locally.
-  ac_save_LIBS="$LIBS"
+  ac_getloadavg_LIBS=$LIBS
   LIBS="-L/usr/local/lib $LIBS"
   AC_CHECK_LIB(getloadavg, getloadavg,
-    LIBS="-lgetloadavg $LIBS", LIBS="$ac_save_LIBS")
+               [LIBS="-lgetloadavg $LIBS"], [LIBS=$ac_getloadavg_LIBS])
 fi
 
-# Make sure it is really in the library, if we think we found it.
-AC_REPLACE_FUNCS(getloadavg)
-
-if test $ac_cv_func_getloadavg = yes; then
-  AC_DEFINE(HAVE_GETLOADAVG, 1, [FIXME])
-  ac_have_func=yes
-else
-  AC_DEFINE(C_GETLOADAVG, 1, [Define if using getloadavg.c.])
-  # Figure out what our getloadavg.c needs.
-  ac_have_func=no
-  AC_CHECK_HEADER(sys/dg_sys_info.h,
-  [ac_have_func=yes; AC_DEFINE(DGUX, 1, [FIXME])
-  AC_CHECK_LIB(dgc, dg_sys_info)])
-
-  AC_CHECK_HEADERS(locale.h)
-  AC_CHECK_FUNCS(setlocale)
-
-  # We cannot check for <dwarf.h>, because Solaris 2 does not use dwarf (it
-  # uses stabs), but it is still SVR4.  We cannot check for <elf.h> because
-  # Irix 4.0.5F has the header but not the library.
-  if test $ac_have_func = no && test $ac_cv_lib_elf_elf_begin = yes; then
-    ac_have_func=yes; AC_DEFINE(SVR4, 1, [FIXME])
-  fi
-
-  if test $ac_have_func = no; then
-    AC_CHECK_HEADER(inq_stats/cpustats.h,
-    [ac_have_func=yes; AC_DEFINE(UMAX, 1, [FIXME])
-    AC_DEFINE(UMAX4_3, 1, [FIXME])])
-  fi
-
-  if test $ac_have_func = no; then
-    AC_CHECK_HEADER(sys/cpustats.h,
-    [ac_have_func=yes; AC_DEFINE(UMAX, 1, [FIXME])])
-  fi
-
-  if test $ac_have_func = no; then
-    AC_CHECK_HEADERS(mach/mach.h)
-  fi
-
-  AC_CHECK_HEADER(nlist.h,
-  [AC_DEFINE(NLIST_STRUCT, 1, [FIXME])
-  AC_CACHE_CHECK([for n_un in struct nlist], ac_cv_struct_nlist_n_un,
-  [AC_TRY_COMPILE([#include <nlist.h>],
-  [struct nlist n; n.n_un.n_name = 0;],
-  ac_cv_struct_nlist_n_un=yes, ac_cv_struct_nlist_n_un=no)])
-  if test $ac_cv_struct_nlist_n_un = yes; then
-    AC_DEFINE(NLIST_NAME_UNION, 1, [FIXME])
-  fi
-  ])dnl
-fi # Do not have getloadavg in system libraries.
+# Make sure it is really in the library, if we think we found it,
+# otherwise set up the replacement function.
+AC_CHECK_FUNCS(getloadavg, [],
+               [_AC_LIBOBJ_GETLOADAVG])
 
 # Some definitions of getloadavg require that the program be installed setgid.
-dnl FIXME Don't hardwire the path of getloadavg.c in the top-level directory.
 AC_CACHE_CHECK(whether getloadavg requires setgid,
-  ac_cv_func_getloadavg_setgid,
+               ac_cv_func_getloadavg_setgid,
 [AC_EGREP_CPP([Yowza Am I SETGID yet],
-[#include "$srcdir/lib/getloadavg.c"
+[#include "$ac_lib_dir_getloadavg/getloadavg.c"
 #ifdef LDAV_PRIVILEGED
 Yowza Am I SETGID yet
-#endif],
-  ac_cv_func_getloadavg_setgid=yes, ac_cv_func_getloadavg_setgid=no)])
+@%:@endif],
+              ac_cv_func_getloadavg_setgid=yes,
+              ac_cv_func_getloadavg_setgid=no)])
 if test $ac_cv_func_getloadavg_setgid = yes; then
-  NEED_SETGID=true; AC_DEFINE(GETLOADAVG_PRIVILEGED, 1, [FIXME])
+  NEED_SETGID=true
+  AC_DEFINE(GETLOADAVG_PRIVILEGED, 1,
+            [Define if the `getloadavg' function needs to be run setuid
+             or setgid.])
 else
   NEED_SETGID=false
 fi
@@ -103,25 +83,21 @@ AC_SUBST(NEED_SETGID)dnl
 
 if test $ac_cv_func_getloadavg_setgid = yes; then
   AC_CACHE_CHECK(group of /dev/kmem, ac_cv_group_kmem,
-[  # On Solaris, /dev/kmem is a symlink.  Get info on the real file.
+[ # On Solaris, /dev/kmem is a symlink.  Get info on the real file.
   ac_ls_output=`ls -lgL /dev/kmem 2>/dev/null`
   # If we got an error (system does not support symlinks), try without -L.
   test -z "$ac_ls_output" && ac_ls_output=`ls -lg /dev/kmem`
   ac_cv_group_kmem=`echo $ac_ls_output \
-    | sed -ne 's/[ 	][ 	]*/ /g;
+    | sed -ne ['s/[ 	][ 	]*/ /g;
 	       s/^.[sSrwx-]* *[0-9]* *\([^0-9]*\)  *.*/\1/;
-	       / /s/.* //;p;'`
-]
-)
-  KMEM_GROUP=$ac_cv_group_kmem
+	       / /s/.* //;p;']`
+])
+  AC_SUBST(KMEM_GROUP, $ac_cv_group_kmem)dnl
 fi
-AC_SUBST(KMEM_GROUP)dnl
-
-if test x = "x$am_cv_saved_LIBS"; then
-  GETLOADAVG_LIBS="$LIBS"
+if test "x$ac_save_LIBS" = x; then
+  GETLOADAVG_LIBS=$LIBS
 else
-  GETLOADAVG_LIBS=`echo "$LIBS"|sed "s!$am_cv_saved_LIBS!!"`
+  GETLOADAVG_LIBS=`echo "$LIBS" | sed "s!$ac_save_LIBS!!"`
 fi
 AC_SUBST(GETLOADAVG_LIBS)dnl
-LIBS="$am_cv_saved_LIBS"
-])
+])# AC_FUNC_GETLOADAVG