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changeset 5158:c710d6c89900

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(gl_PREREQ_EUIDACCESS): Don't bother checking for unistd.h, as autoconf does this for us. Check for libgen.h. Also look for eaccess within -lgen, which is where it is in Solaris. Set LIB_EACCESS accordingly. (gl_FUNC_NONREENTRANT_EUIDACCESS): New macro. (gl_FUNC_EUIDACCESS): Use AC_CHECK_DECLS_ONCE, not AC_CHECK_DECLS. (gl_PREREQ_EUIDACCESS): Check for eaccess and setregid decls. Require AC_HEADER_STAT.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 06 Aug 2004 23:44:59 +0000
parents 62fa339919f4
children a535859efd14
files m4/euidaccess.m4
diffstat 1 files changed, 29 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/m4/euidaccess.m4
+++ b/m4/euidaccess.m4
@@ -1,17 +1,28 @@
-# euidaccess.m4 serial 2
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+# euidaccess.m4 serial 4
+dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
 dnl This file is free software, distributed under the terms of the GNU
 dnl General Public License.  As a special exception to the GNU General
 dnl Public License, this file may be distributed as part of a program
 dnl that contains a configuration script generated by Autoconf, under
 dnl the same distribution terms as the rest of that program.
 
+AC_DEFUN([gl_FUNC_NONREENTRANT_EUIDACCESS],
+[
+  AC_REQUIRE([gl_FUNC_EUIDACCESS])
+  AC_DEFINE([PREFER_NONREENTRANT_EUIDACCESS], 1,
+    [Define this if you prefer euidaccess to return the correct result
+     even if this would make it nonreentrant.  Define this only if your
+     entire application is safe even if the uid or gid might temporarily
+     change.  If your application uses signal handlers or threads it
+     is probably not safe.])
+])
+
 AC_DEFUN([gl_FUNC_EUIDACCESS],
 [
   dnl Persuade glibc <unistd.h> to declare euidaccess().
   AC_REQUIRE([AC_GNU_SOURCE])
 
-  AC_CHECK_DECLS([euidaccess])
+  AC_CHECK_DECLS_ONCE([euidaccess])
   AC_REPLACE_FUNCS(euidaccess)
   if test $ac_cv_func_euidaccess = no; then
     gl_PREREQ_EUIDACCESS
@@ -20,7 +31,21 @@
 
 # Prerequisites of lib/euidaccess.c.
 AC_DEFUN([gl_PREREQ_EUIDACCESS], [
-  AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_CHECK_HEADERS_ONCE(libgen.h)
+  AC_CHECK_DECLS_ONCE(setregid)
   AC_REQUIRE([AC_FUNC_GETGROUPS])
+  AC_REQUIRE([AC_HEADER_STAT])
+
+  # Solaris 9 needs -lgen to get the eaccess function.
+  # Save and restore LIBS so -lgen isn't added to it.  Otherwise, *all*
+  # programs in the package would end up linked with that potentially-shared
+  # library, inducing unnecessary run-time overhead.
+  gl_saved_libs=$LIBS
+    AC_SEARCH_LIBS(eaccess, [gen],
+                   [test "$ac_cv_search_eaccess" = "none required" ||
+                    LIB_EACCESS=$ac_cv_search_eaccess])
+    AC_SUBST(LIB_EACCESS)
+    AC_CHECK_FUNCS(eaccess)
+  LIBS=$gl_saved_libs
 ])