install-reloc: Support multi-binary installation.

[gnulib.git] / m4 / sys_utsname_h.m4

diff --git a/m4/sys_utsname_h.m4 b/m4/sys_utsname_h.m4
index 2e688fb..1ad7a43 100644 (file)
--- a/m4/sys_utsname_h.m4
+++ b/m4/sys_utsname_h.m4
@@ -1,5 +1,5 @@
-# sys_utsname_h.m4 serial 1
-dnl Copyright (C) 2009 Free Software Foundation, Inc.
+# sys_utsname_h.m4 serial 8
+dnl Copyright (C) 2009-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -12,23 +12,43 @@ AC_DEFUN([gl_SYS_UTSNAME_H],
   dnl once only, before all statements that occur in other macros.
   AC_REQUIRE([gl_SYS_UTSNAME_H_DEFAULTS])
 
-  AC_CHECK_HEADERS_ONCE([sys/utsname.h])
+  dnl <sys/utsname.h> is always overridden, because of GNULIB_POSIXCHECK.
+  gl_CHECK_NEXT_HEADERS([sys/utsname.h])
   if test $ac_cv_header_sys_utsname_h != yes; then
-    SYS_UTSNAME_H='sys/utsname.h'
+    HAVE_SYS_UTSNAME_H=0
+    HAVE_STRUCT_UTSNAME=0
+  else
+    HAVE_SYS_UTSNAME_H=1
+    AC_CHECK_TYPES([struct utsname], [], [HAVE_STRUCT_UTSNAME=0], [[
+/* Minix 3.1.8 has a bug: <stddef.h> must be included before
+   <sys/utsname.h>.  */
+#include <stddef.h>
+#include <sys/utsname.h>
+      ]])
   fi
+  AC_SUBST([HAVE_SYS_UTSNAME_H])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[
+    /* Minix 3.1.8 has a bug: <stddef.h> must be included before
+       <sys/utsname.h>.  */
+    #include <stddef.h>
+    #include <sys/utsname.h>
+    ]], [uname])
 ])
 
 AC_DEFUN([gl_SYS_UTSNAME_MODULE_INDICATOR],
 [
   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
   AC_REQUIRE([gl_SYS_UTSNAME_H_DEFAULTS])
-  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 ])
 
 AC_DEFUN([gl_SYS_UTSNAME_H_DEFAULTS],
 [
-  GNULIB_UNAME=0;   AC_SUBST([GNULIB_UNAME])
+  GNULIB_UNAME=0;         AC_SUBST([GNULIB_UNAME])
   dnl Assume proper GNU behavior unless another module says otherwise.
-  HAVE_UNAME=1;     AC_SUBST([HAVE_UNAME])
-  SYS_UTSNAME_H=''; AC_SUBST([SYS_UTSNAME_H])
+  HAVE_UNAME=1;           AC_SUBST([HAVE_UNAME])
+  HAVE_STRUCT_UTSNAME=1;  AC_SUBST([HAVE_STRUCT_UTSNAME])
 ])