I'm starting to import gnulib changes from coreutils.
The first step is to add a new module "verify", which defines macros
verify(EXPR) and verify_expr(EXPR) that act like assert(EXPR) except
they check EXPR at compile-time, not at run-time. verify(EXPR) is for
declaration contexts, and verify_expr is for expression contexts.
Here's the patch I just installed:
2005-09-22 Paul Eggert <[EMAIL PROTECTED]>
* MODULES.html.sh (Diagnostics <assert.h>): New section,
with "verify" module.
* modules/verify: New file.
* lib/verify.h: New file.
Index: MODULES.html.sh
===================================================================
RCS file: /cvsroot/gnulib/gnulib/MODULES.html.sh,v
retrieving revision 1.107
diff -p -u -r1.107 MODULES.html.sh
--- MODULES.html.sh 16 Sep 2005 06:52:14 -0000 1.107
+++ MODULES.html.sh 22 Sep 2005 22:54:16 -0000
@@ -1424,6 +1424,16 @@ func_all_modules ()
func_wrap H2
func_echo "$element"
+ element="Diagnostics <assert.h>"
+ element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
+ func_section_wrap ansic_enh_assert_diagnostics
+ func_wrap H3
+ func_echo "$element"
+
+ func_begin_table
+ func_module verify
+ func_end_table
+
element="Memory management functions <stdlib.h>"
element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
func_section_wrap ansic_enh_stdlib_memory
--- /dev/null 2005-06-27 15:40:05.000000000 -0700
+++ modules/verify 2005-09-20 22:51:57.000000000 -0700
@@ -0,0 +1,21 @@
+Description:
+Compile-time assert-like macros.
+
+Files:
+lib/verify.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += verify.h
+
+Include:
+"verify.h"
+
+License:
+GPL
+
+Maintainer:
+Paul Eggert, Jim Meyering
--- /dev/null 2005-06-27 15:40:05.000000000 -0700
+++ lib/verify.h 2005-09-20 22:36:37.000000000 -0700
@@ -0,0 +1,57 @@
+/* Compile-time assert-like macros.
+
+ Copyright (C) 2005 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Paul Eggert and Jim Meyering. */
+
+#ifndef VERIFY_H
+# define VERIFY_H 1
+
+# define GL_CONCAT0(x, y) x##y
+# define GL_CONCAT(x, y) GL_CONCAT0 (x, y)
+
+/* A type that is valid if and only if R is nonzero.
+ R should be an integer constant expression.
+ verify_type__ and verify_error_if_negative_size__ are symbols that
+ are private to this header file. */
+
+# define verify_type__(R) \
+ struct { int verify_error_if_negative_size__ : (R) ? 1 : -1; }
+
+/* Verify requirement R at compile-time, as a declaration.
+ R should be an integer constant expression.
+ Unlike assert, there is no run-time overhead.
+
+ The implementation uses __LINE__ to lessen the probability of
+ generating a warning that verify_function_NNN is multiply declared.
+ However, even if two declarations in different files have the same
+ __LINE__, the multiple declarations are still valid C89 and C99
+ code because they simply redeclare the same external function, so
+ no conforming compiler will reject them outright. */
+
+# define verify(R) \
+ extern verify_type__ (R) GL_CONCAT (verify_function_, __LINE__) (void)
+
+/* Verify requirement R at compile-time, as an expression.
+ R should be an integer constant expression.
+ Unlike assert, there is no run-time overhead.
+ This macro can be used in some contexts where verify cannot, and vice versa.
+ Return void. */
+
+# define verify_expr(R) ((void) ((verify_type__ (R) *) 0))
+
+#endif
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