X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=build-aux%2Fwarn-on-use.h;h=37b6d2986a367deaefc1fcd77d71d3d255b659ff;hb=eae8e44ccfca3e367df3be11c3f5de48c4302093;hp=3d93a9e9716143fa69b1cffc16ec46d885e4af97;hpb=039dc49e7e584131dc304bfb99b6e52812092827;p=gnulib.git

diff --git a/build-aux/warn-on-use.h b/build-aux/warn-on-use.h
index 3d93a9e97..37b6d2986 100644
--- a/build-aux/warn-on-use.h
+++ b/build-aux/warn-on-use.h
@@ -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/>.  */
 
-/* _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
@@ -70,6 +70,33 @@ extern __typeof__ (function) function __attribute__ ((__warning__ (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)))
+# 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