# HG changeset patch
# User Paul Eggert <eggert@cs.ucla.edu>
# Date 1060284794 0
# Node ID c5ffba0b61b5e11b033f57233d77deab36912716
# Parent  c761847c9afa887ab5696d9d111ec847fbcac0e3
Add 'restrict' module.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2003-08-07 Paul Eggert  <eggert@twinsun.com>
+
+	* modules/restrict: New file.
+	* MODULES.html.sh (func_all_modules): Add restrict.
+	* modules/regex: Depend on restrict.
+	
 2003-08-07  Bruno Haible  <bruno@clisp.org>
 
 	* modules/getndelim2 (Makefile.am): Add the files to EXTRA_DIST, not
diff --git a/MODULES.html.sh b/MODULES.html.sh
--- a/MODULES.html.sh
+++ b/MODULES.html.sh
@@ -1593,6 +1593,16 @@
   func_wrap H2
   func_echo "$element"
 
+  element="Keywords"
+  element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
+  func_section_wrap isoc_sup_keywords
+  func_wrap H3
+  func_echo "$element"
+
+  func_begin_table
+  func_module restrict
+  func_end_table
+
   element="Boolean type and values <stdbool.h>"
   element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
   func_section_wrap isoc_sup_stdbool
diff --git a/m4/ChangeLog b/m4/ChangeLog
--- a/m4/ChangeLog
+++ b/m4/ChangeLog
@@ -1,3 +1,8 @@
+2003-08-07  Paul Eggert  <eggert@twinsun.com>
+
+	* restrict.m4: New file.
+	* regex.m4 (jm_PREREQ_REGEX): Add gl_C_RESTRICT.
+
 2003-08-07  Bruno Haible  <bruno@clisp.org>
 
 	* getndelim2.m4 (gl_GETNDELIM2): Use AC_LIBOBJ(getndelim2). This makes
diff --git a/m4/regex.m4 b/m4/regex.m4
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,4 +1,4 @@
-#serial 17
+#serial 18
 
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
@@ -110,6 +110,7 @@
   dnl Persuade glibc <string.h> to declare mempcpy().
   AC_REQUIRE([AC_GNU_SOURCE])
 
+  AC_REQUIRE([gl_C_RESTRICT])
   AC_REQUIRE([AC_FUNC_ALLOCA])
   AC_REQUIRE([AC_HEADER_STDC])
   AC_CHECK_HEADERS_ONCE(limits.h string.h wchar.h wctype.h)
diff --git a/m4/restrict.m4 b/m4/restrict.m4
new file mode 100644
--- /dev/null
+++ b/m4/restrict.m4
@@ -0,0 +1,33 @@
+#serial 1002
+# This macro can be removed once we can rely on Autoconf 2.57a or later,
+# since we can then use its AC_C_RESTRICT.
+
+# gl_C_RESTRICT
+# --------------
+# Determine whether the C/C++ compiler supports the "restrict" keyword
+# introduced in ANSI C99, or an equivalent.  Do nothing if the compiler
+# accepts it.  Otherwise, if the compiler supports an equivalent,
+# define "restrict" to be that.  Here are some variants:
+# - GCC supports both __restrict and __restrict__
+# - older DEC Alpha C compilers support only __restrict
+# - _Restrict is the only spelling accepted by Sun WorkShop 6 update 2 C
+# Otherwise, define "restrict" to be empty.
+AC_DEFUN([gl_C_RESTRICT],
+[AC_CACHE_CHECK([for C/C++ restrict keyword], gl_cv_c_restrict,
+  [gl_cv_c_restrict=no
+   # Try the official restrict keyword, then gcc's __restrict, and
+   # the less common variants.
+   for ac_kw in restrict __restrict __restrict__ _Restrict; do
+     AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+      [float * $ac_kw x;])],
+      [gl_cv_c_restrict=$ac_kw; break])
+   done
+  ])
+ case $gl_cv_c_restrict in
+   restrict) ;;
+   no) AC_DEFINE(restrict,,
+	[Define to equivalent of C99 restrict keyword, or to nothing if this
+	is not supported.  Do not define if restrict is supported directly.]) ;;
+   *)  AC_DEFINE_UNQUOTED(restrict, $gl_cv_c_restrict) ;;
+ esac
+])
diff --git a/modules/regex b/modules/regex
--- a/modules/regex
+++ b/modules/regex
@@ -10,6 +10,7 @@
 alloca
 unlocked-io
 gettext
+restrict
 
 configure.ac:
 gl_REGEX
diff --git a/modules/restrict b/modules/restrict
new file mode 100644
--- /dev/null
+++ b/modules/restrict
@@ -0,0 +1,17 @@
+Description:
+The C99 'restrict' keyword.
+
+Files:
+m4/restrict.m4
+
+Depends-on:
+
+configure.ac:
+gl_C_RESTRICT
+
+Makefile.am:
+
+Include:
+
+Maintainer:
+Paul Eggert and Jim Meyering