iswblank: Ensure declaration on glibc systems.

* m4/iswblank.m4 (gl_FUNC_ISWBLANK): Require gl_USE_SYSTEM_EXTENSIONS.
* modules/iswblank (Dependencies): Add 'extensions'.
* doc/posix-functions/iswblank.texi: Document the glibc problem.

diff --git a/ChangeLog b/ChangeLog
index 6266eaa6f694b2f881a9ac2e1973f64417fe5405..6fed235d54fce9fd50838f08ac3f1154c71c7c3a 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-02-06  Bruno Haible  <bruno@clisp.org>
+
+       iswblank: Ensure declaration on glibc systems.
+       * m4/iswblank.m4 (gl_FUNC_ISWBLANK): Require gl_USE_SYSTEM_EXTENSIONS.
+       * modules/iswblank (Dependencies): Add 'extensions'.
+       * doc/posix-functions/iswblank.texi: Document the glibc problem.
+
 2011-02-06  Bruno Haible  <bruno@clisp.org>
 
        New module 'iswblank'.

diff --git a/doc/posix-functions/iswblank.texi b/doc/posix-functions/iswblank.texi
index 367a5e2fe35e754275c5f03dfa8bdab270191c1b..b36e69fc08d8c2dc580ddeee9dd15f03e8a0b2c0 100644 (file)
--- a/doc/posix-functions/iswblank.texi
+++ b/doc/posix-functions/iswblank.texi
@@ -15,6 +15,9 @@ AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw.
 This function is declared but not defined on some platforms:
 IRIX 6.5.30.
 @item
+This function is not declared (without @code{-D_GNU_SOURCE}) on some platforms:
+glibc 2.8.
+@item
 This function returns 0 for all possible arguments on some platforms:
 Linux libc5.
 @end itemize

diff --git a/m4/iswblank.m4 b/m4/iswblank.m4
index 8f15f40e45492e8920ecdba656f51e36423ff843..38641ffb66833cb91453bf4c3cf3d54bae00e117 100644 (file)
--- a/m4/iswblank.m4
+++ b/m4/iswblank.m4
@@ -1,4 +1,4 @@
-# iswblank.m4 serial 1
+# iswblank.m4 serial 2
 dnl Copyright (C) 2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -8,6 +8,8 @@ AC_DEFUN([gl_FUNC_ISWBLANK],
 [
   AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
   AC_REQUIRE([gl_WCTYPE_H])
+  dnl Persuade glibc <wctype.h> to declare iswblank().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   AC_CHECK_FUNCS_ONCE([iswblank])
   AC_CHECK_DECLS_ONCE([iswblank])
   if test $ac_cv_func_iswblank = no; then

diff --git a/modules/iswblank b/modules/iswblank
index 2a4a81731903e865fc08372d3dcb651819d5dc98..972107eb21c12252a988e0540effcd7bcdd06cbc 100644 (file)
--- a/modules/iswblank
+++ b/modules/iswblank
@@ -7,6 +7,7 @@ m4/iswblank.m4
 
 Depends-on:
 wctype-h
+extensions
 
 configure.ac:
 gl_FUNC_ISWBLANK