(atexit): Define using a prototype.

[gnulib.git] / m4 / group-member.m4

diff --git a/m4/group-member.m4 b/m4/group-member.m4
index bdfdec4..36fda49 100644 (file)
--- a/m4/group-member.m4
+++ b/m4/group-member.m4
@@ -1,12 +1,24 @@
-#serial 1
+#serial 4
 
 dnl Written by Jim Meyering
 
-AC_DEFUN(jm_FUNC_GROUP_MEMBER,
-  [
-    dnl Do this replacement check manually because I want the hyphen
-    dnl (not the underscore) in the filename.
-    AC_CHECK_FUNC(group_member, , [LIBOBJS="$LIBOBJS group-member.$ac_objext"])
-    AC_SUBST(LIBOBJS)
-  ]
-)
+AC_DEFUN([jm_FUNC_GROUP_MEMBER],
+[
+  dnl Persuade glibc <unistd.h> to declare group_member().
+  AC_REQUIRE([AC_GNU_SOURCE])
+
+  dnl Do this replacement check manually because I want the hyphen
+  dnl (not the underscore) in the filename.
+  AC_CHECK_FUNC(group_member, , [
+    AC_LIBOBJ(group-member)
+    gl_PREREQ_GROUP_MEMBER
+  ])
+])
+
+# Prerequisites of lib/group-member.c.
+AC_DEFUN([gl_PREREQ_GROUP_MEMBER],
+[
+  AC_REQUIRE([AC_HEADER_STDC])
+  AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_REQUIRE([AC_FUNC_GETGROUPS])
+])