fflush: also replace fclose when fixing fflush

[gnulib.git] / build-aux / warn-on-use.h

diff --git a/build-aux/warn-on-use.h b/build-aux/warn-on-use.h
index 3d93a9e..c14fb27 100644 (file)
--- a/build-aux/warn-on-use.h
+++ b/build-aux/warn-on-use.h
@@ -1,5 +1,5 @@
 /* A C macro for emitting warnings if a function is used.
 /* A C macro for emitting warnings if a function is used.

-   Copyright (C) 2010 Free Software Foundation, Inc.
+   Copyright (C) 2010-2011 Free Software Foundation, Inc.

 
    This program is free software: you can redistribute it and/or modify it
    under the terms of the GNU Lesser General Public License as published
 
    This program is free software: you can redistribute it and/or modify it
    under the terms of the GNU Lesser General Public License as published


@@ -14,7 +14,7 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 

-/* _GL_WARN_ON_USE(function, "literal string") issues a declaration
+/* _GL_WARN_ON_USE (function, "literal string") issues a declaration

    for FUNCTION which will then trigger a compiler warning containing
    the text of "literal string" anywhere that function is called, if
    supported by the compiler.  If the compiler does not support this
    for FUNCTION which will then trigger a compiler warning containing
    the text of "literal string" anywhere that function is called, if
    supported by the compiler.  If the compiler does not support this


@@ -67,9 +67,43 @@
 /* A compiler attribute is available in gcc versions 4.3.0 and later.  */
 #  define _GL_WARN_ON_USE(function, message) \
 extern __typeof__ (function) function __attribute__ ((__warning__ (message)))
 /* A compiler attribute is available in gcc versions 4.3.0 and later.  */
 #  define _GL_WARN_ON_USE(function, message) \
 extern __typeof__ (function) function __attribute__ ((__warning__ (message)))

-
+# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
+/* Verify the existence of the function.  */
+#  define _GL_WARN_ON_USE(function, message) \
+extern __typeof__ (function) function

 # else /* Unsupported.  */
 #  define _GL_WARN_ON_USE(function, message) \
 # else /* Unsupported.  */
 #  define _GL_WARN_ON_USE(function, message) \

-extern int _gl_warn_on_use
+_GL_WARN_EXTERN_C int _gl_warn_on_use
+# endif
+#endif
+
+/* _GL_WARN_ON_USE_CXX (function, rettype, parameters_and_attributes, "string")
+   is like _GL_WARN_ON_USE (function, "string"), except that the function is
+   declared with the given prototype, consisting of return type, parameters,
+   and attributes.
+   This variant is useful for overloaded functions in C++. _GL_WARN_ON_USE does
+   not work in this case.  */
+#ifndef _GL_WARN_ON_USE_CXX
+# if 4 < __GNUC__ || (__GNUC__ == 4 && 3 <= __GNUC_MINOR__)
+#  define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
+extern rettype function parameters_and_attributes \
+     __attribute__ ((__warning__ (msg)))
+# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
+/* Verify the existence of the function.  */
+#  define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
+extern rettype function parameters_and_attributes
+# else /* Unsupported.  */
+#  define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
+_GL_WARN_EXTERN_C int _gl_warn_on_use
+# endif
+#endif
+
+/* _GL_WARN_EXTERN_C declaration;
+   performs the declaration with C linkage.  */
+#ifndef _GL_WARN_EXTERN_C
+# if defined __cplusplus
+#  define _GL_WARN_EXTERN_C extern "C"
+# else
+#  define _GL_WARN_EXTERN_C extern

 # endif
 #endif
 # endif
 #endif