+2020-08-09 Bruno Haible <bruno@clisp.org>
+
+ Add ability to emit user-defined warnings and errors with clang.
+ * m4/gnulib-common.m4 (gl_COMMON_BODY): Define _GL_ATTRIBUTE_ERROR,
+ _GL_ATTRIBUTE_WARNING using an attribute for clang.
+ * lib/warn-on-use.h (_GL_WARN_ON_USE, _GL_WARN_ON_USE_ATTRIBUTE,
+ _GL_WARN_ON_USE_CXX): Define using an attribute for clang.
+ * lib/cdefs.h (__warndecl, __warnattr, __errordecl): Define using an
+ attribute for clang.
+
2020-08-09 Bruno Haible <bruno@clisp.org>
intprops: Fix typo in comment.
# define __warnattr(msg) __attribute__((__warning__ (msg)))
# define __errordecl(name, msg) \
extern void name (void) __attribute__((__error__ (msg)))
+#elif __clang_major__ >= 4
+# define __warndecl(name, msg) \
+ extern void name (void) __attribute__((__diagnose_if__ (1, msg, "warning")))
+# define __warnattr(msg) __attribute__((__diagnose_if__ (1, msg, "warning")))
+# define __errordecl(name, msg) \
+ extern void name (void) __attribute__((__diagnose_if__ (1, msg, "error")))
#else
# define __warndecl(name, msg) extern void name (void)
# define __warnattr(msg)
extern __typeof__ (function) function __attribute__ ((__warning__ (message)))
# define _GL_WARN_ON_USE_ATTRIBUTE(message) \
__attribute__ ((__warning__ (message)))
+# elif __clang_major__ >= 4
+/* Another compiler attribute is available in clang. */
+# define _GL_WARN_ON_USE(function, message) \
+extern __typeof__ (function) function \
+ __attribute__ ((__diagnose_if__ (1, message, "warning")))
+# define _GL_WARN_ON_USE_ATTRIBUTE(message) \
+ __attribute__ ((__diagnose_if__ (1, message, "warning")))
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
/* Verify the existence of the function. */
# define _GL_WARN_ON_USE(function, message) \
_GL_WARN_ON_USE (function, msg)
# else
# if 4 < __GNUC__ || (__GNUC__ == 4 && 3 <= __GNUC_MINOR__)
+/* A compiler attribute is available in gcc versions 4.3.0 and later. */
+# define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
+extern rettype function parameters_and_attributes \
+ __attribute__ ((__warning__ (msg)))
+# elif __clang_major__ >= 4
+/* Another compiler attribute is available in clang. */
# define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
extern rettype function parameters_and_attributes \
- __attribute__ ((__warning__ (msg)))
+ __attribute__ ((__diagnose_if__ (1, msg, "warning")))
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
/* Verify the existence of the function. */
# define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
-# gnulib-common.m4 serial 53
+# gnulib-common.m4 serial 54
dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
# define _GL_ATTR_cold _GL_GNUC_PREREQ (4, 3)
# define _GL_ATTR_const _GL_GNUC_PREREQ (2, 95)
# define _GL_ATTR_deprecated _GL_GNUC_PREREQ (3, 1)
+# define _GL_ATTR_diagnose_if 0
# define _GL_ATTR_error _GL_GNUC_PREREQ (4, 3)
# define _GL_ATTR_externally_visible _GL_GNUC_PREREQ (4, 1)
# define _GL_ATTR_fallthrough _GL_GNUC_PREREQ (7, 0)
#if _GL_HAS_ATTRIBUTE (error)
# define _GL_ATTRIBUTE_ERROR(msg) __attribute__ ((__error__ (msg)))
# define _GL_ATTRIBUTE_WARNING(msg) __attribute__ ((__warning__ (msg)))
+#elif _GL_HAS_ATTRIBUTE (diagnose_if)
+# define _GL_ATTRIBUTE_ERROR(msg) __attribute__ ((__diagnose_if__ (1, msg, "error")))
+# define _GL_ATTRIBUTE_WARNING(msg) __attribute__ ((__diagnose_if__ (1, msg, "warning")))
#else
# define _GL_ATTRIBUTE_ERROR(msg)
# define _GL_ATTRIBUTE_WARNING(msg)